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이명열(M. R. Lee),이종욱(J. W. Lee),김영득(Y. D. Kim),신종호(J. H. Shin) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.5
The purposes of this study investigate effect of forging and hot and cold rolling on mechanical properties in austenitic high nitrogen steel(HNS) containing Cu and Ni. The 100㎏ HNS ingots manufactured by Pressurized Vacuum Induction Melting(PVIM) were forged and followed hot and cold rolling. Peak stress(σp) decreased with strain increase. Tensile and yield stress strength were decreased with addition of Cu and Ni, while enlongation was increased slightly. There was no difference in nitrogen contents with addition of Cu and Ni.
TP304계 고질소 스테인레스강의 단조특성과 냉간압연 모사
이명열(M. R. Lee),이종욱(J. W. Lee),김병구(B. K. Kim),김영득(Y. D. Kim),신종호(J. H. Shin) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
오스테나이트계 고질소 스테인레스간 4가지 후보강종인 HNS C1, C2, C3, C4에 대해 질소함량, 가압조건 따른 단조재와 온도 및 동일한 가압조건에서 Ni 합금원소 첨가유무에 따른 용체화 처리재(HNS C1, C3)의 물성평가와 실제 냉연 공정의 pass schedule 검증을 위한 모사실험을 통해 다음과 같이 요약 하였다. 1) 가압증가에 따른 질소함량의 증가로 강도 및 경도가 동시 상승하며, 결정립의 미세화 및 기계적 쌍정 발생이 많았다. 동일한 가압조건에서 Ni 첨가된 HNS C3가 Ni 미첨가한 HNS C1보다 강도-연성 조합평가에서 열/냉간 가공성 등의 특성이 우수하였다. 2)고칠소강 스테인레스강의 적정한 용체와 처리온도 범위는 상요화된 AISI304와 유사한 1050~1100℃이며, 용체화처리 후 냉각방법의 변경(수냉과 공냉)에 따른 경도의 편차는 없었다. 3)냉연 pass schedule 검증을 위한 모사실험에서 초기 압연의 최적조건은 roll속도 5mpm, pass당 압연율 15~17%였다. Several high nitrogen stainless steel ingots(100kg) were fabricated with changing Ni and [N]₂ contents by Pressurized Vacuum Induction Melting(P_VIM). After free forging process, chemical compositions, microstructure and mechanical properties were estimate. Hardness was increased with the increase of [N]₂ content. Furthermore, microstructure including a lot of tempering twins was observed with optical microscope. Mechanical properties were estimates as function of solution treatment temperature and cooling method(air/water) under duration time of lhr on sample that were fabricated with Ni content under the atmospheric [N]₂ pressure. At solution treatment range of 1050~1100℃, hardness was decreased with the increase of solution temperature and there were little discrepancy of microstructure and hardness with cooling method. Computer simulation was carried out in order to inspect pass schedule in cold rolling process. When the condition of simulation was roll speed of 2.5mpm, rolling rate 15~17% per pass, it was ascertained that the formation such as deformation by sticking and lamellar sliver etc. was restricted from a simulation.