Influence of Al on the Microstructural Evolution and Mechanical Behavior of Low-Carbon, Manganese Transformation-Induced-Plasticity Steel
Influence of Al on the Microstructural Evolution and Mechanical Behavior of Low-Carbon, Manganese Transformation-Induced-Plasticity Steel
复制标题
DOI：
10.1007/s11661-009-0124-7
复制
发表时间：
2010-02
期刊：
影响因子：
--
通讯作者：
D. Suh;Seongjun Park;Tae-Ho Lee;C. Oh;Sung-Joon Kim
中科院分区：
文献类型：
--
作者：
D. Suh;Seongjun Park;Tae-Ho Lee;C. Oh;Sung-Joon Kim
建议对用于连续退火工艺的低碳锰相变诱导塑性 (Mn TRIP) 钢进行添加 Al 的微观结构设计。当Al含量为1质量%时，两相区退火过程中无法避免冷轧组织的再结晶与奥氏体形成之间的竞争，变形基体的再结晶不能有效进行。然而，添加 3% 质量分数的 Al 可以提供由铁素体和马氏体组成的双相冷轧结构，并在较高的退火温度下抑制过量的奥氏体形成，从而使变形微观结构几乎完全再结晶。优化的退火条件可确保含有 3% 质量百分比 Al 的 Mn TRIP 钢中的临界奥氏体在室温下保持稳定，从而在拉伸变形过程中能够持续转变为马氏体。该合金呈现出优异的强度-延展性平衡，抗拉强度约为 1 GPa，总伸长率超过 25%，与经过间歇式退火的 Mn TRIP 钢相当。
Microstructural design with an Al addition is suggested for low-carbon, manganese transformation-induced-plasticity (Mn TRIP) steel for application in the continuous-annealing process. With an Al content of 1 mass pct, the competition between the recrystallization of the cold-rolled microstructure and the austenite formation cannot be avoided during intercritical annealing, and the recrystallization of the deformed matrix does not proceed effectively. The addition of 3 mass pct Al, however, allows nearly complete recrystallization of the deformed microstructure by providing a dual-phase cold-rolled structure consisting of ferrite and martensite and by suppressing excessive austenite formation at a higher annealing temperature. An optimized annealing condition results in the room-temperature stability of the intercritical austenite in Mn TRIP steel containing 3 mass pct Al, permitting persistent transformation to martensite during tensile deformation. The alloy presents an excellent strength-ductility balance combining a tensile strength of approximately 1 GPa with a total elongation over 25 pct, which is comparable to that of Mn TRIP steel subjected to batch-type annealing.