设计了新型低碳、5%锰、含铝TRIP钢,通过扫描电子显微镜(SEM)、X射线衍射仪(XRD)及室温拉伸性能测试研究了不同热处理工艺对试验钢残留奥氏体和力学性能的影响,并借助Therma-Calc热力学软件对试验钢进行了平衡热力学计算.结果表明:1%Al元素的添加,使得试验钢平衡相图中的两相区温度范围扩大并向高温区移动.试验钢在660℃等温5 min后,可以获得15.1%的残留奥氏体,对应的抗拉强度803 MPa,伸长率可以达到24%,即试验钢经过一步简单的短时间两相区退火处理后可以获得数量较多的残留奥氏体和比较理想的力学性能.另外通过在640℃、660℃两个温度进行不同时间的等温退火处理发现,随着两相区等温时间的延长,残留奥氏体的量逐渐增多,最高可以达到20.5%;等温时间越长屈服强度越低,试验钢的加工硬化性能越好.最高强度-塑性匹配出现在640℃等温1h后,抗拉强度720 MPa,伸长率可以达到30%.
参考文献
[1] | Emmanuel De Moor .Austenite stabilization through manganese enrichment[J].Scripta materialia,2011(2):185-188. |
[2] | SHI Jie;SUN Xin-jun;WANG Mau-qiu et al.Enhanced work-hardening behavior and mechanical properties in ultrafine-grained steels with largefractioned metastable austenite[J].Scripta Materialia,2010,63:815. |
[3] | H. Takechi .Transformation Hardening of Steel Sheet for Automotive Applications[J].JOM,2008(12):22-26. |
[4] | 王艾青,王建,张宇光,马海.Al对TRIP钢两相区退火组织性能的影响[J].金属热处理,2010(09):56-59. |
[5] | Jae-Myeong Jang;Sung-Joon Kim;Nam Hyun Kang .Effects of Annealing Conditions on Microstructure and Mechanical Properties of Low Carbon, Manganese Transformation-Induced Plasticity Steel[J].Metals and Materials International,2009(6):909-916. |
[6] | 王海涛,何燕霖,张梅.Al元素对TRIP钢组织的影响[J].上海金属,2005(05):23-25,36. |
[7] | 奚琰;赵金龙;史文 等.贝氏体区等温处理对超高强度TRIP钢组织的影响[J].上海金属,2010,33(01):34-38. |
[8] | 梁亚红,陈冷.TRIP钢显微组织和织构的研究[J].材料热处理学报,2008(05):106-109. |
[9] | E. Jimenez-Melero;N.H. van Dijk;L. Zhao .The effect of aluminium and phosphorus on the stability of individual austenite grains in TRIP steels[J].Acta materialia,2009(2):533-543. |
[10] | L.Li,P.Wollants,Y.L.He,B.C.De Cooman,X.C.Wei,Z.Y.Xu.REVIEW AND PROSPECT OF HIGH STRENGTH LOW ALLOY TRIP STEEL[J].金属学报(英文版),2003(06):457-465. |
[11] | 凌云涛,何忠平,何燕霖.Si-Mn系低碳钢经DP和TRIP处理后组织与性能的对比性研究[J].上海金属,2011(01):39-43. |
[12] | Monideepa Mukherjee;Shiv Brat Singh;Omkar Nath Mohanty .Microstructural characterization of TRIP-aided steels[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2008(1/2):32-37. |
[13] | Samek L;Moor E D;Penning J et al.Static strain aging of microstructure constituents in transformation-induced-plasticity steel[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,2008,39:2542-2554. |
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