崔田灏,周乐育,何建中,张朝磊,刘雅政

• 1:北京科技大学材料科学与工程学院
• 2:包头钢铁(集团)公司技术中心

摘要(Abstract)：

采用光学显微镜、扫描电镜、纳米力学探针、透射电镜等技术对不同Si含量(0.03%和1.077%)的DP600级别热轧双相钢单向拉伸过程组织特征进行研究,分析了Si含量对相同工艺条件下双相钢显微组织特征,以及塑性变形过程中强化相与基体协调变形行为的影响。结果表明:Si作为一种铁素体形成元素,能够增加铁素体的形核率,具有细化铁素体晶粒的作用,可增加铁素体体积分数,分割并细化马氏体。Si含量的增加促进了C元素向马氏体富集,提升了单位体积马氏体的碳含量,使部分板条马氏体转变为孪晶马氏体,增加了马氏体硬度。由于Si对铁素体的净化作用,高Si实验钢中位错在铁素体中滑移时不易受到碳化物的钉扎作用。因此在相同工艺条件下,Si含量的增加可以提高双相钢的抗拉强度,提高硬度,降低屈强比。

关键词(KeyWords)： DP600热轧双相钢;微观组织;显微硬度;位错;析出碳化物

Abstract:

Keywords:

基金项目(Foundation): 中央高校基本科研业务费专项资金(FRF-TP-12-046A);; 北京高校“青年英才计划”(YETP0355)

作者(Author): 崔田灏,周乐育,何建中,张朝磊,刘雅政

DOI: 10.13289/j.issn.1009-6264.2015.09.018

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