第25卷第1期 2017年2月
材料科学与工艺
MATERIALS SCIENCE & TECHNOLOGY
D0I:10.11951/i.issn.1005-0299.20160206
Vol. 25No. 1 Feb.2017
Q&P 热处理工艺对含 Cu TRIP钢组织和性能的影响
梁孟甜，申勇峰，薛文颖2，卢兴超
（1.材料各向异性与织构教育部重点实验室（东北大学），沈阳110819;2.轧制技术与连轧自动化
国家重点实验室（东北大学），沈阳110819）
摘要：随着能源的短缺和环境污染的日益严重，汽车轻量化需求日益追切，如何通过工艺及成分设计革新、获得兼具高强度和高塑性的钢板尤为重要.尝试将Cu作为合金元素加入TRIP钢中，采用率火配分（Q&P）工艺对含CuTRIP钢进行一步法和两步法热处理，通过拉伸试验、X射线衍射分析、扫描电镜、透射电镜等实验手段，对热处理后的组织及性能进行测试和观察，探究了不同热处理工艺对组织和性能的影响.研究结果表明：一步法处理后的显微组织为铁素体、马氏体和残余奥氏体，两步法处理后不仅包含上述3种组织，还含有贝氏体.一步法处理后，抗拉强度达2200MPa，拉伸延展率为15%，强塑积为33GPa·%：两步法处理后综合力学性能优于一步法，在400℃等温5min后，抗拉强度为 1300MPa，拉伸延展率为43%，强塑积超过55CPa·%.实验钢良好的综合力学性能得益于铁素体、马氏体/贝氏体和残
余奥民体的合理配比，变形过程中残余奥氏体的相变诱导塑性效应，以及马民体位错与Cu粒子的交互作用关键词：TRIP钢；Q&P工艺；强塑积；残余奥氏体；富Cu粒子
中图分类号：TG14
文献标志码：A
文章编号：1005-0299(2017)01-0050-06
Influence of quenchingandpartitioning onmicrostructureand
mechanical properties of a Cu-TRIP steel
LIANGMengtian',SHENYongfeng',XUEWenying,LUXingchao
( 1.Key Laboratory for Anisotropy and Texture of Materials( Northeastern University) , Ministry of Education, Shenyang 110819
China ; 2.State Key Laboratory of Rolling and Automation (Northeastern University), Shenyang 110819, China)
Abstract: A Cu-TRIP steel was heat-treated by quenching and partitioning (Q&P) processes including one-step (QT=PT, Quenching Temperature, Partitioning Temperature) and two-step(QT≠PT). Microstructures and properties differences were investigated by means of tensile tests, X-Ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Results show that microstructure after one-step consists of martensite, ferrite, and retained austenite while that after two-step contains bainite except for the aforementioned three microstructures. Tensile strength and elongation are 2 200 MPa and 15% respectively after one-step, accompanied with a product of strength and elongation of 33 GPa ·%. As far as two-step is concerned, a combination of tensile strength of 1 300 MPa and elongation of 43% is obtained at partitioning temperature of 400 C with the highest product of strength and elongation of ~55 GPa ·% which is prior to one-step. The eminent mechanical properties benefit from relative contents of phases, TRIP effect, and interaction between Cu precipitates and dislocation in martensite.
Keywords : TRIP steel ; Q&P process ; product of strength and elongation ; retained austenite; Cu precipitates
收稿日期：2016-06-28.
网络出版时间：2017-01-03
基金项目：国家自然科学基金面上项目（51574079）；国家重点研
发计划项目（2016YFB0300601）：国家自然科学基金委员会与中国工程物理研究院联合基金资助项目(U1430132)
作者简介：桑孟甜（1992一），女，硕士研究生；
申勇峰（1968一），男，教授，博士生导师
通信作者：男数据ail：shenyf@smm.neu.edu.cn
随着汽车工业的快速发展，全球汽车生产量和保有量飞速增长，能源消耗、环境污染两大问题日益凸显，节能减排、低碳环保已成为发展汽车工业的核心间题[1-3].SPEER教授等[4]于2003年提出一种新型热处理工艺，即淬火-配分（Quenching andPartitioning，Q&P）工艺，该工艺可使钢同时