| 引用本文: | 赵征志,尹鸿祥,赵爱民,何建国,丁然,郑红红.连续退火对5% Mn超细晶TRIP钢组织性能的影响[J].材料科学与工艺,2014,22(5):54-59.DOI:10.11951/j.issn.1005-0299.20140510. |
| ZHAO Zhengzhi,YIN Hongxiang,ZHAO Aimin,HE Jianguo,DING Ran,ZHENG Honghong.Effect of continuous annealing process on microstructure and mechanical properties of 5% Mn ultrafine grain TRIP steel[J].Materials Science and Technology,2014,22(5):54-59.DOI:10.11951/j.issn.1005-0299.20140510. |
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| 摘要: |
| 为开发强度和塑性良好配合的第三代汽车钢,采用CCT-AY-Ⅱ型钢板连续退火机模拟分析了不同退火温度和时间对0.1C-5Mn中锰TRIP钢组织性能的影响规律.采用SEM和EBSD等微观分析方法观察不同工艺下制备的中锰TRIP的微观组织,利用XRD方法测量残余奥氏体体积分数,通过实验测量其力学性能.结果表明:实验的中锰TRIP钢在650 ℃保温3 min退火后获得最佳的综合力学性能,其抗拉强度为1 022 MPa,总延伸率为19.3%,强塑积为20 GPa%；应变前期试验钢中大量残余奥氏体发生转变,超细晶间的协调机制对试验钢的塑性起主导作用. |
| 关键词: 中锰钢 亚稳奥氏体 超细晶 两相区退火 孪晶 连续退火 |
| DOI：10.11951/j.issn.1005-0299.20140510 |
| 分类号:TG142. 1; TG113. 25 |
| 基金项目:国家自然科学基金资助项目(50904006)；中央高校基本科研业务费专项资金(FRF-TP-10-001A)；教育部博士学科点专项科研基金(20110006110007). |
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| Effect of continuous annealing process on microstructure and mechanical properties of 5% Mn ultrafine grain TRIP steel |
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ZHAO Zhengzhi, YIN Hongxiang, ZHAO Aimin, HE Jianguo, DING Ran, ZHENG Honghong
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(Metallurgical Engineering Research Institute, University of Science and Technology Beijing, Beijing 100083, China)
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| Abstract: |
| To develop the third generation of automobile steel which has good balance of strength and plasticity, the effect of different annealing temperature and time on microstructure and mechanical properties of 0.1C-5Mn medium-manganese TRIP steel were investigated on heat treatment system for thin steel Sheet CCT-AY-Ⅱ type. Microstructure of the steel was observed by means of SEM and EBSD. The amount of retained austenite in the steel was determined by X-ray diffraction analysis and its mechanical properties were measured in the laboratory. The results show that the best comprehensive mechanical properties are obtained for the experimental steel annealed at 650 ℃ for 3 min．Its tensile strength is 1 022 MPa, total elongation is 19.3%, and the product of tensile strength and elongation is 20 GPa%；In the early strain stage, a large amount of retained austenite transforms, and the ultra-fine grains coordination mechanism plays a leading role for plasticity of the experimental steel. |
| Key words: medium-manganese steel metastable austenite ultrafine grain size intercritical annealing twinning continuous annealing |
