Abstract: An Fe-Mn vibration damping alloy steel having a mixture structure of .epsilon., .alpha.' and .gamma.. The alloy steel consists of iron, manganese from 10 to 24% by weight and limited amounts of impurities. The alloy steel is manufactured by preparing an ingot at a temperature of 1000.degree. C. to 1300.degree. C. for 12 to 40 hours to homogenize the ingot and hot-rolling the homogenized ingot to produce a rolled alloy bar or plate, performing solid solution treatment on the alloy steel at 900.degree. C. to 1100.degree. C. for 30 to 60 minutes, cooling the alloy steel by air or water, and cold rolling the alloy steel at a reduction rate of greater than 0% and below 30% at around room temperature.
Type:
Grant
Filed:
August 25, 1995
Date of Patent:
June 3, 1997
Assignee:
Woojin Osk Corporation
Inventors:
Chong-Sool Choi, Man-Eob Lee, Seung-Han Baek, Yong-Chul Son, Jeong-Cheol Kim, Joong-Hwan Jun, Young-Sam Ko
Abstract: A vibration damping alloy has a mixed structure of martensite and austenite. The alloy steel is iron-based to which 14-22% by weight of manganese is added. The vibration damping alloy is manufactured by mixing electrolytic iron and manganese in a molten state. The molten mixture, containing 14-22% of manganese with the remainder of iron, is cast as an ingot. The ingot is homogenized at 1000.degree.-1300.degree. C. for 20-40 hours and then hot rolled at 900.degree.-1100.degree. C. for 20 minutes to 90 minutes. The ingot is cooled with air or water.
Type:
Grant
Filed:
October 19, 1992
Date of Patent:
March 1, 1994
Assignee:
Woojin Osk Corporation
Inventors:
Jong-Sul Choi, Seung-Han Baek, Jun-Dong Kim