Abstract: A powder metallurgical process for producing dense low-alloy ferrous parts having selected carburized surface portions in which a metal powder of the desired composition is briquetted into a shape-retaining preform, the preform is masked, sintered, carburized whereafter the mask is removed and the resultant preform is forged to a desired final shape. The forged part is then quenched immediately following the forge operation for hardness or if desired it can be further heat treated in another manner to obtain other mechanical properties.

Abstract: A novel and improved method of forging preselected recessed surfaces in a member is disclosed which comprises the steps of adding a suitable lubricant material to at least a slave or primary preform member wherein the lubricant material is sufficient to prevent welding between the noted preforms during the forging operation. Moreover, the method envisions the step of joining the slave preform to the primary body preform member, followed by forging the joined together preforms such that the primary preform member is deformed to an extent generally complementary to a portion of the configuration of the slave preform, such that the forged primary preform has formed therein a shaped recess generally complementary to at least a portion of the configuration of the slave preform. It is contemplated that the forged slave and primary preforms are quenched subsequent to forging. Thereafter, the method contemplates removing the quenched slave preform from the primary preform.

Abstract: A composite heavy-duty machine element such as a face gear (FIG. 7), a spur or helical gear (FIG. 14), or ball bearing races (FIG. 18), has its working or load bearing portion composed of sintered powdered high-performance alloy while its supporting portion not subjected to concentrated or intense heavy loads is made of a base metal such assintered powdered iron. In FIGS. 1 through 18 the powders of the two portions are inserted separately and successively in the die cavity of a briquetting press and simultaneously compacted to form a composite briquette which is then sintered to bond the separate portions together even though they are of different materials with different physical characteristics.

Abstract: A method of making forged powdered iron base metal articles of high Rc hardness without need for further machining, surface treatment nor heat treatment after quenching comprising forming a pre-alloyed metal powder, compressing said powder into a briquette, sintering said briquette into a preform, heating said preform to a temperature above its austenizing temperature, forging said preform while above its austenizing temperature into a forged article, permitting the article to cool to approximately its austenizing temperature, and promptly quenching said forged article in a quenching batch.