Ductility and Formability of Newly Developed High Strength Low Alloy TRIP-aided Sheet Steels with Annealed Martensite Matrix
Ductility and Formability of Newly Developed High Strength Low Alloy TRIP-aided Sheet Steels with Annealed Martensite Matrix
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DOI：
10.2355/isijinternational.42.910
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发表时间：
2002-08
影响因子：
1.8
通讯作者：
K. Sugimoto;A. Kanda;Ryo Kikuchi;Hashimoto Shunichi;Takahiro Kashima;S. Ikeda
中科院分区：
文献类型：
--
作者：
K. Sugimoto;A. Kanda;Ryo Kikuchi;Hashimoto Shunichi;Takahiro Kashima;S. Ikeda
汽车用可成形高强度低合金TRIP辅助板材是以退火马氏体基或“TRIP辅助退火马氏体钢”开发的。该钢在马氏体板条晶界存在大量片状残余奥氏体相，其抗应变诱发相变的稳定性高于传统的多边形铁素体“TRIP辅助双相钢”。在600~1000 Mpa的抗拉强度范围内，TRIP辅助退火态马氏体钢表现出较好的大伸长率和面积缩小率。此外，它们还具有与以贝氏体铁素体为基体的“TRIP辅助贝氏体钢”相同的优异的拉伸法兰性能和弯曲性能。从母体组织、第二相与母体的强度比、残余奥氏体稳定性、内应力等方面对这些性能进行了讨论。
Formable high-strength low-alloy TRIP-aided sheet steels with annealed martensite matrix or "TRIP-aided annealed martensitic steel" were developed for automotive applications. The steels possessed a large amount of plate-like retained austenite along annealed martensite lath boundary, whose stability against the strain-induced transformation was higher than that of the conventional "TRIP-aided dual-phase steel" with polygonal ferrite matrix. In a tensile strength range between 600 and 1000 MPa, the TRIP-aided annealed martensite steels exhibited a superior large elongation and reduction of area. In addition, they possessed the same excellent stretch-flangeability and bendability as "TRIP-aided bainitic steel" with bainitic ferrite matrix. These properties were discussed by matrix structure, a strength ratio of second phase to matrix, retained austenite stability, internal stress and so on.