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현주식(Joosik Hyun),문만빈(Manbeen Moon),오현운(Hyunwoon Oh) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
HS440, HS590 as an automotive steel sheet, which are used for a structural part in an auto-body, are occasionally exposed in the various temperature environments(about -50℃ ~ 150℃). Therefore, It is required to evaluate the mechanical characteristics(tensile strength, yield strength, elongation, work-hardening exponent etc.) under the low to high temperature environment. In this study, in order to identify the mechanical characteristics of HS440 and HS590, the uniaxial tensile tests are performed with the variation of temperature range from -60℃ to 200℃. Tensile tests carried out using universal testing machine(ZWICK Z250) with installed temperature chamber and acquired stress-strain relation, tensile strength, yield strength, elongation, work hardening exponent at the various temperature conditions. The test results showed that the mechanical properties(strength, elongation etc.) increased in the low temperature(0℃ ~ -60℃) and decreased in the high temperature(50℃ ~ 200℃). Accordingly, It is necessary to evaluate the accurate material properties and has to consider the change of mechanical properties with the variation of temperature for the safety design of an auto-body.
내덴트성이 우수한 자동차 외판용 고장력 340Mpa급 BH강판 개발
고훙석(Hungsuk Koh),문만빈(Manbeen Moon),신철수(Chirlsoo Shin),오현운(Hyunwoon Oh) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In the this study, the influence of chemical composition(added-Ti, Nb) and CAL(Continuous Annealing Line) condition on baking hardenability(BH) were investigated with various types of HS340㎫ bake-hardenable steels sheet for automobile outside panel. BH value of Ti-added steel was stably expressed over 3kgf/㎟. In order to obtain BH over 3kgf/㎟, Nb-added BH steel is more difficulties in controlling annealing temperature and line speed than Ti-added BH steel.<br/> <br/>