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Fe-Co기 고인성 고강도강의 반복 열처리 거동- Part 1. 조직제어
윤보희 ( Bo Hee Yoon ),박경태 ( Kyoung Tae Park ),이태혁 ( Tae Hyuk Lee ),김재훈 ( Jae Hoon Kim ),김홍규 ( Hong Kyu Kim ),이성 ( Seong Lew ),이종현 ( Jong Hyeon Lee ) 한국주조공학회 2012 한국주조공학회지 Vol.32 No.1
In this study, microstructural evaluation was carried out on secondary hardening type ultrahigh strength steel, Fe-Co-Ni composition. This paper as a first part of whole research presented the microstructural behavior by cyclic heat treatment. The cyclic heat treatment method includes normalizing, stress relieving, solution treatment and aging. Especially, solution treatments performed triple times to get maximized solution hardening. Phase transformation and microstructure were observed by using optical microscope (OM), Electron back-scattered diffraction (EBSD) and X-ray stress analyzer. During the triple solution treatment, size of grain boundary was dramatically decreased by generating a packet from the martensite transformation of residual austenite in the inner part of grain, whereas the hardness increase was not significant.