이상조직강판의 성형특성에 미치는 Mo와 Cr첨가의 영향

• Published in: 대한금속·재료학회지, 46(11) Vol. 46; no. 11; pp. 713 - 724
• Main Authors: 한성호, Seong Ho Han, 안연상, Yeon Sang Ahn, 진광근, Kwang Geun Chin, 김인배, In Bae Kim
• Format: Journal Article
• Language: Korean
• Published: 대한금속재료학회 01.12.2008; 대한금속·재료학회
• Subjects: deep drawability; dual phase steel; high strength steel; recrystallization texture; 재료공학
• ISSN: 1738-8228; 2288-8241

The need to lower the weights of automotive vehicle and to improve the safety of cars has resulted in the development of high strength steels such as TRIP(Transformation Induced Plasticity) and DP (Dual Phase) steel. It is well known that the higher strength of steel shows the poorer press formability. Among the high strength steels, DP steel shows several good characteristics such as low yield ratio, high initial n value, high elongation, high bake hardenability and anti-aging property. However, there`s a certain limit in application of DP steels to the automotive panel parts because their poor deep drawbility caused by martensite. In this study, the effect of alloying elements on the deep drawability and recrystallization texture in TS 440MPa grade DP steel with 0.015~0.02% carbon has been investigated on the base of SEM, TEM, XRD and EBSD analysis.