| 引用本文: | 梁孟甜,申勇峰,薛文颖,卢兴超.Q&P热处理工艺对含Cu TRIP钢组织和性能的影响[J].材料科学与工艺,2017,25(1):50-55.DOI:10.11951/j.issn.1005-0299.20160206. |
| LIANG Mengtian,SHEN Yongfeng,XUE Wenying,LU Xingchao.Influence of quenching and partitioning on microstructure and mechanical properties of a Cu-TRIP steel[J].Materials Science and Technology,2017,25(1):50-55.DOI:10.11951/j.issn.1005-0299.20160206. |
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| 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迫切，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，采用淬火配分(Q&P)工艺对含Cu TRIP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2 200 MPa，拉伸延展率为15%，强塑积为33 GPa·%；两步法处理后综合力学性能优于一步法，在400 ℃等温5 min后，抗拉强度为1 300 MPa，拉伸延展率为43%，强塑积超过55 GPa·%.实验钢良好的综合力学性能得益于铁素体、马氏体/贝氏体和残余奥氏体的合理配比，变形过程中残余奥氏体的相变诱导塑性效应，以及马氏体位错与Cu粒子的交互作用.
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| 关键词: TRIP钢 Q&P工艺 强塑积 残余奥氏体 富Cu粒子 |
| DOI：10.11951/j.issn.1005-0299.20160206 |
| 分类号:TG14 |
| 文献标识码:A |
| 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). |
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| Influence of quenching and partitioning on microstructure and mechanical properties of a Cu-TRIP steel |
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LIANG Mengtian1, SHEN Yongfeng1, XUE Wenying2, LU Xingchao1
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(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)
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| 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 ℃ 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.
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| Key words: TRIP steel Q&P process product of strength and elongation retained austenite Cu precipitates |
