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김대온(Daeon Kim),문만빈(Manbeen Moon),신철수(Chirlsoo Shin) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The effects of annealing conditions on the mechanical properties of dual phase steels with two different compositions have been investigated. 0.08C-0.02Si-I.9Mn and 0.07C-0.05Si-2.2Mn steels were used to reveal the effect of soaking temperature and overaging temperature. Micro-structures were observed with Lepera's etching method for delineating the martensite phase of dual phase steels. The best heat-treatment condition of 590MPa grade Dual Phase steels was proposed on the base of this study.<br/>
김석봉(Seokbong Kim),허훈(Hoon Huh),김대온(Daeon Kim),문만빈(Manbin Moon) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
An important challenging issue in the automotive industry is the light-weight, safe design and enhancement of crash response of an auto-body structures. These objectives lead to increasing adoption of high strength steel sheet for inner and outer auto-body members. This study evaluates the dynamic tensile characteristics of high strength steel sheets, HS45R, TRIP60, DP60 and DP100, along the rolling direction and transverse direction. Static tensile tests were carried out at the strain rate of 0.003/sec using the static tensile machine (Instron 5583). Dynamic tensile tests were carried out at the range of strain rate from 0.1/sec to 200/sec using a high speed material testing machine developed. The tensile tests acquire stress-strain relation and strain rate sensitivity of each material. The experimental results show two important aspects for high strength steels: the flow stress is increased as strain rate increases; the strain hardening is decreased as the tensile stress increases. The experiments also produce interesting results that the elongation is not decreased even when the strain rate increases.