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金属学报  2015 

马氏体的分布对双相钢微观变形行为和力学性能的影响

DOI: 10.11900/0412.1961.2015.00083, PP. 1092-1100

Keywords: 双相钢,微观结构,塑性变形,分级淬火,临界区退火,数字图像相关(DIC)

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Abstract:

通过工艺设计,对工业20钢进行了分级淬火(SQ)和临界区退火(IA)热处理,获得了马氏体体积分数相近、但马氏体分别呈离散分布和连续分布的2种双相钢.对它们的拉伸/冲击力学性能进行了表征;应用数字图像相关(DIC)方法获得双相钢的微观应变分布,并结合表面微裂纹分析,揭示了2种双相钢的不同变形断裂机制.SQ双相钢展现出较低的强度,但具有更好的塑性与冲击韧性,这源于铁素体较大变形松弛了马氏体在变形中产生的应力集中;而IA双相钢中铁素体变形受到周围马氏体的阻碍,铁素体相对小的变形不能有效松弛变形马氏体的应力,使裂纹优先在马氏体中产生,因而IA双相钢具有高强度和低塑性.

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