Patents by Inventor YOUNG SANG NA
YOUNG SANG NA has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Patent number: 11572612Abstract: A high-entropy alloy having ultra-high strength and high hydrogen embrittlement resistance due to formation of a microstructure at a low strain may be produced without a severe plastic deformation. A method for producing the high-entropy alloy includes (a) annealing and homogenizing an initial alloy material at 1000 to 1200° C. for 1 to 24 hours; and (b) rolling the annealed and homogenized initial alloy material into a rod, at a cryogenic temperature of ?100 to ?200° C. while pressing the initial alloy material in multi-axial directions at a strain of 0.4 to 1.2, thereby to produce the high-entropy alloy having intersecting twins as a microstructure, and secondary fine twins formed in the intersecting twins, wherein the initial alloy material contains Co of 5 to 35%, Cr of 5 to 35%, Fe of 5 to 35%, Mn of 5 to 35%, and Ni of 5 to 35%, based on weight %.Type: GrantFiled: November 30, 2018Date of Patent: February 7, 2023Assignee: KOREA INSTITUTE OF MATERIALS SCIENCEInventors: Jong Woo Won, Young Sang Na, Ka Ram Lim
-
Patent number: 11198169Abstract: The present invention relates to a blow molding device including: a heating unit which is configured to heat a molding material; and molds between which the molding material is loaded and molded, in which the heating unit includes: an infrared lamp configured to emit infrared rays, a reflective mirror configured to concentrate the infrared rays emitted from the infrared lamp; and a light transmitting body configured to transmit the infrared rays concentrated by the reflective mirror to the molding material, and in which the molds mold the molding material by using gas pressures applied to surfaces of the molding material heated to a predetermined temperature by the infrared rays transmitted from the light transmitting body.Type: GrantFiled: March 22, 2018Date of Patent: December 14, 2021Assignee: KOREA INSTITUTE OF MATERIALS SCIENCEInventors: Young Sang Na, Ka Ram Lim, Jong Woo Won
-
Patent number: 11168386Abstract: The present invention relates to a high-entropy alloy especially having excellent low-temperature tensile strength and elongation by means of having configured, through thermodynamic calculations, an alloy composition region having an FCC single-phase microstructure at 700° C. or higher, and enabling the FCC single-phase microstructure at room temperature and at an ultra-low temperature. The high-entropy alloy, according to the present invention, comprises: Co: 3-12 at %; Cr: 3-18 at %; Fe: 3-50 at %; Mn: 3-20 at %; Ni: 17-45 at %; V: 3-12 at %; and unavoidable impurities, wherein the ratio of the V content to the Ni content (V/Ni) is 0.5 or less, and the sum of the V content and the Co content is 22 at % or less.Type: GrantFiled: March 21, 2017Date of Patent: November 9, 2021Assignees: POSTECH ACADEMY-INDUSTRY FOUNDATION, THE INDUSTRY & ACADEMIC COOPERATION IN CHUNGNAM NATIONAL UNIVERSITYInventors: Byeong-joo Lee, Sung-hak Lee, Hyoung-seop Kim, Young-sang Na, Sun-ig Hong, Won-mi Choi, Chang-woo Jeon, Seung-mun Jung
-
Patent number: 10988834Abstract: The present invention relates to a high-entropy alloy especially having excellent low-temperature tensile strength and elongation by means of having configured, through thermodynamic calculations, an alloy composition region having an FCC single-phase microstructure at 700° C. or higher, and enabling the FCC single-phase microstructure at room temperature and at an ultra-low temperature. The high-entropy alloy, according to the present invention, comprises: Cr: 3-18 at %; Fe: 3-60 at %; Mn: 3-40 at% ; Ni: 20-80 at %: 3-12 at %; and unavoidable impurities, wherein the ratio of the V content to the Ni content (V/Ni) is 0.5 or less.Type: GrantFiled: March 21, 2017Date of Patent: April 27, 2021Assignees: POSTECH ACADEMY-INDUSTRY FOUNDATION, THE INDUSTRY & ACADEMIC COOPERATION IN CHUNGNAM NATIONAL UNIVERSITYInventors: Byeong-joo Lee, Sung-hak Lee, Hyoung-seop Kim, Young-sang Na, Sun-ig Hong, Won-mi Choi, Chang-woo Jeon, Seung-mun Jung
-
Publication number: 20200392613Abstract: A high-entropy alloy having ultra-high strength and high hydrogen embrittlement resistance due to formation of a microstructure at a low strain may be produced without a severe plastic deformation. A method for producing the high-entropy alloy includes (a) annealing and homogenizing an initial alloy material at 1000 to 1200° C. for 1 to 24 hours; and (b) rolling the annealed and homogenized initial alloy material into a rod, at a cryogenic temperature of ?100 to ?200° C. while pressing the initial alloy material in multi-axial directions at a strain of 0.4 to 1.2, thereby to produce the high-entropy alloy having intersecting twins as a microstructure, and secondary fine twins formed in the intersecting twins, wherein the initial alloy material contains Co of 5 to 35%, Cr of 5 to 35%, Fe of 5 to 35%, Mn of 5 to 35%, and Ni of 5 to 35%, based on weight %.Type: ApplicationFiled: November 30, 2018Publication date: December 17, 2020Inventors: Jong Woo WON, Young Sang NA, Ka Ram LIM
-
Patent number: 10675674Abstract: The present invention relates to a casting mold for a metal sheet by drawing molten metal into a mold cavity and cooling the molten metal, and the casting mold according to the present invention includes: a support portion at an upper side on which molten metal is disposed or a solid metal is placed and melted; a mold cavity at a lower side in which the metal sheet is formed as the molten metal is drawn from the support portion while filling the mold cavity and cooled; and a passageway through which the molten metal is drawn into the mold cavity from the support portion, in which the mold cavity includes a first surface at the upper side which communicates with the passageway, and a second surface at the lower side which faces the first surface, a plurality of suction portions for drawing the molten metal are formed in the second surface and extended downward from the second surface, the suction portions are connected to a vacuum source and configured to draw the molten metal by suctioning air from the mold cType: GrantFiled: June 13, 2017Date of Patent: June 9, 2020Assignee: Korea Institute of Machinery & MaterialsInventors: Ka Ram Lim, Young Sang Na
-
Publication number: 20200130040Abstract: The present invention relates to a blow molding device including: a heating unit which is configured to heat a molding material; and molds between which the molding material is loaded and molded, in which the heating unit includes: an infrared lamp configured to emit infrared rays, a reflective mirror configured to concentrate the infrared rays emitted from the infrared lamp; and a light transmitting body configured to transmit the infrared rays concentrated by the reflective mirror to the molding material, and in which the molds mold the molding material by using gas pressures applied to surfaces of the molding material heated to a predetermined temperature by the infrared rays transmitted from the light transmitting body.Type: ApplicationFiled: March 22, 2018Publication date: April 30, 2020Applicant: Korea Institute of Machinery & MaterialsInventors: Young Sang NA, Ka Ram LIM, Jong Woo WON
-
Publication number: 20190071755Abstract: The present invention relates to a high-entropy alloy especially having excellent low-temperature tensile strength and elongation by means of having configured, through thermodynamic calculations, an alloy composition region having an FCC single-phase microstructure at 700° C. or higher, and enabling the FCC single-phase microstructure at room temperature and at an ultra-low temperature. The high-entropy alloy, according to the present invention, comprises: Co: 3-12 at %; Cr: 3-18 at %; Fe: 3-50 at %; Mn: 3-20 at %; Ni: 17-45 at %; V: 3-12 at %; and unavoidable impurities, wherein the ratio of the V content to the Ni content (V/Ni) is 0.5 or less, and the sum of the V content and the Co content is 22 at % or less.Type: ApplicationFiled: March 21, 2017Publication date: March 7, 2019Inventors: Byeong-joo LEE, Sung-hak LEE, Hyoung-seop KIM, Young-sang NA, Sun-ig HONG, Won-mi CHOI, Chang-woo JEON, Seung-mun JUNG
-
Publication number: 20190055630Abstract: The present invention relates to a high-entropy alloy especially having excellent low-temperature tensile strength and elongation by means of having configured, through thermodynamic calculations, an alloy composition region having an FCC single-phase microstructure at 700° C. or higher, and enabling the FCC single-phase microstructure at room temperature and at an ultra-low temperature. The high-entropy alloy, according to the present invention, comprises: Cr: 3-18 at %; Fe: 3-60 at %; Mn: 3-40 at% ; Ni: 20-80 at %: 3-12 at %; and unavoidable impurities, wherein the ratio of the V content to the Ni content (V/Ni) is 0.5 or less.Type: ApplicationFiled: March 21, 2017Publication date: February 21, 2019Inventors: Byeong-joo LEE, Sung-hak LEE, Hyoung-seop KIM, Young-sang NA, Sung-ig HONG, Won-mi CHOI, Chang-woo JEON, Seung-mum JUNG
-
Publication number: 20190001401Abstract: The present invention relates to a casting mold for a metal sheet by drawing molten metal into a mold cavity and cooling the molten metal, and the casting mold according to the present invention includes: a support portion at an upper side on which molten metal is disposed or a solid metal is placed and melted; a mold cavity at a lower side in which the metal sheet is formed as the molten metal is drawn from the support portion while filling the mold cavity and cooled; and a passageway through which the molten metal is drawn into the mold cavity from the support portion, in which the mold cavity includes a first surface at the upper side which communicates with the passageway, and a second surface at the lower side which faces the first surface, a plurality of suction portions for drawing the molten metal are formed in the second surface and extended downward from the second surface, the suction portions are connected to a vacuum source and configured to draw the molten metal by suctioning air from the mold cType: ApplicationFiled: June 13, 2017Publication date: January 3, 2019Applicant: Korea Institute of Machinery & MaterialsInventors: Ka Ram LIM, Young Sang NA
-
Patent number: 9790577Abstract: There is provided a Ti—Al-based alloy ingot having ductility at room temperature, in which the Ti—Al-based ingot has a lamellar structure in which ?2 phases and ? phases are arranged sequentially and regularly, and a thickness ratio ?/?2 of the ? phase to the ?2 phase is equal to or more than 2. There is also provided a Ti—Al-based alloy ingot having ductility at room temperature, in which the Ti—Al-based alloy ingot has a lamellar structure in which ?2 phases and ? phases are arranged sequentially and regularly, the ? phase has a thickness of 100 nm to 200 nm, and the ?2 phase has a thickness of 100 nm or less.Type: GrantFiled: November 27, 2013Date of Patent: October 17, 2017Assignee: KOREA INSTITUTE OF MACHINERY & MATERIALSInventors: Seong Woong Kim, Seung Eon Kim, Young Sang Na, Jong Taek Yeom
-
Publication number: 20170268090Abstract: The invention relates to a method capable of enhancing both the antifouling properties of a high entropy alloy and also the mechanical properties thereof, without using chemical substances such as antifouling paints to prevent the attachment of animals and plants such as barnacles, mussels, sea lettuces, diatoms, etc., the method according to the invention being characterized by the use of severe plastic deformation to reduce the grain size in a high entropy alloy and thereby impart to the high entropy alloy a property of suppressing the attachment of aquatic or marine organisms, and according to the method, environmental issues caused by the use of antifouling paint, which is conventionally the most widely used method, may be resolved, and the energy efficiency of ships may be improved, thereby reducing societal and economic loss.Type: ApplicationFiled: November 7, 2016Publication date: September 21, 2017Inventors: Hyoung Seop KIM, Dong Hyun AHN, Sung Hak LEE, Soo Hyun JOO, Byeong Joo LEE, Young sang NA, Sun lg HONG, JONG UN MOON, Min Ji JANG, Dong Soo HWANG
-
Publication number: 20160145721Abstract: The present invention relates to A titanium-aluminum-based alloy comprising: 40 to 46 at % of aluminum (Al); 3 to 6 at % of niobium (Nb); 0.3 to 0.5 at % of creep-property enhancer; at least any one of 1 to 3 at % of tungsten (W) and 1 to 3 at % of chrome (Cr); and the balance of titanium (Ti), wherein the creep-property enhancer comprises silicon (Si) and boron (B), wherein the boron is added at 0.05 to 0.2 at %.Type: ApplicationFiled: November 19, 2015Publication date: May 26, 2016Applicant: KOREA INSTITUTE OF MACHINERY & MATERIALSInventors: Seong Woong KIM, Young Sang NA, Seung Eon KIM, Jae Keun HONG
-
Publication number: 20150322549Abstract: A lamellar titanium-aluminium (TiAl) alloy having a beta-gamma phase according to the present invention contains aluminum (Al) of 40˜46 at %, niobium (Nb) of 3˜6 at %, a creep resistance enhancer of 0.2˜0.4 at %, a softening resistance enhancer of 2 at %, and the balance of titanium (Ti) and is manufactured by vacuum arc melting.Type: ApplicationFiled: August 30, 2012Publication date: November 12, 2015Applicant: KOREA INSTITUTE OF MACHINERY & MATERIALSInventors: Seong Woong KIM, Young Sang NA, Seung Eon KIM, Jong Taek YEOM
-
Publication number: 20140341775Abstract: There is provided a Ti—Al-based alloy ingot having ductility at room temperature, in which the Ti—Al-based ingot has a lamellar structure in which ?2 phases and ? phases are arranged sequentially and regularly, and a thickness ratio ?/?2 of the ? phase to the ?2 phase is equal to or more than 2. There is also provided a Ti—Al-based alloy ingot having ductility at room temperature, in which the Ti—Al-based alloy ingot has a lamellar structure in which ?2 phases and ? phases are arranged sequentially and regularly, the ? phase has a thickness of 100 nm to 200 nm, and the ?2 phase has a thickness of 100 nm or less.Type: ApplicationFiled: November 27, 2013Publication date: November 20, 2014Applicant: Korea Institute of Machinery & MaterialsInventors: SEONG WOONG KIM, SEUNG EON KIM, YOUNG SANG NA, JONG TAEK YEOM