1983 年 30 巻 4 号 p. 156-161
Our results show that by changing the size and the content of high chromium iron powder, carbides in roll steel can be easily controlled. It is well known that carbides as well as matrix play an important role in roll steel: A new P/M process, called "The Pre-mix Process", developed by KOBE STEEL, LTD., provides an easy way to control the properties of carbides such as size, content and morphology. In "The Pre-mix Process", high chromium iron powder is mixed with roll iron powder and then HIP'ed to a full density. During HIP'ing, high chromium iron powder changes into massive carbides whose size is almost the same as that of powder particles.