艾峥嵘,于凯,吴红艳,等.超低温轧制304奥氏体不锈钢马氏体逆相变及组织表征[J].精密成形工程,2023,15(12):12-18.
AI Zheng-rong,YU Kai,WU Hong-yan,et al.Martensite Reverse Transformation and Microstructure Characterization of 304 Austenite Stainless Steel during Cryogenic Rolling[J].Journal of Netshape Forming Engineering,2023,15(12):12-18. |
| 超低温轧制304奥氏体不锈钢马氏体逆相变及组织表征 |
| Martensite Reverse Transformation and Microstructure Characterization of 304 Austenite Stainless Steel during Cryogenic Rolling |
| 投稿时间：2023-09-19 |
| DOI：10.3969/j.issn.1674-6457.2023.12.002 |
| 中文关键词: 奥氏体不锈钢 超低温轧制 马氏体逆相变 微观组织 力学性能 |
| 英文关键词: austenitic stainless steel cryogenic rolling martensite reverse transformation microstructure mechanical property |
| 基金项目:国家自然科学基金(51204050);中央高校基本科研业务费项目(N110407005) |
|
| 摘要点击次数: 1193 |
| 全文下载次数: 488 |
| 中文摘要: |
| 目的 研究超低温轧制(Cryogenic Rolling，CR)亚稳态奥氏体不锈钢在不同退火温度下马氏体逆相变、组织演变及力学性能的变化规律。方法 首先，对实验原料304奥氏体不锈钢进行1 050 ℃保温30 min的固溶处理;其次，对实验钢进行总压下量为65%的超低温轧制，并在600~750 ℃下进行5 min退火处理;最后，对退火处理后的实验钢进行组织表征和力学性能测试，研究退火过程中组织演变及力学性能变化规律。结果 经总压下量65%超低温轧制后，实验钢组织中的奥氏体可全部转变为马氏体。随退火温度的升高，发生逆相变的奥氏体含量增加，组织由回复组织逐渐向再结晶组织演变。当退火温度为750 ℃时，晶粒尺寸约为420 nm。经退火处理后，实验钢硬度由超低温轧制态的566.2HV10降至750 ℃时的378.1HV10，屈服强度较固溶态的大幅度提高。经750 ℃退火处理5 min后，实验钢可获得抗拉强度896.5 MPa、延伸率52.7%、强塑积47.2 GPa.%的优异综合力学性能。结论 经超低温轧制及退火处理后，304奥氏体不锈钢可获得晶粒尺寸＜500 nm的亚微米/纳米组织，经700 ℃以上退火处理可获得优于固溶态的综合力学性能。 |
| 英文摘要: |
| The work aims to investigate the change rule of martensite reverse transformation, microstructure evolution and mechanical properties of metastable austenitic stainless steel subject to cryogenic rolling at different annealing temperature. Firstly, the experimental raw material 304 austenitic stainless steel was subject to solution treatment at 1 050 ℃ for 30 min. Then, the experimental steel was treated by cryogenic rolling under a total reduction of 65% and annealed at 600-750 ℃ for 5 min. Finally, the microstructure and mechanical properties of the annealed steel were characterized and tested, and the microstructure evolution and variation of mechanical properties during annealing were studied. After cryogenic rolling under a total reduction of 65%, all the austenite in the experimental steel structure could be transformed into martensite. With the increase of annealing temperature, the austenite content subject to reverse transformation increased, and the structure gradually changed from recovery structure to recrystallization structure. When the annealing temperature was 750 ℃, the grain size was about 420 nm. After annealing treatment, the hardness of the experimental steel decreased from 566.2HV10 under cryogenic rolling to 378.1HV10 with annealing treatment at 750 ℃, and the yield strength under cryogenic rolling was higher than that under solid solution. The excellent comprehensive mechanical properties of the experimental steel such as 896.5 MPa tensile strength, 52.7% elongation and 47.2 GPa.% strong plastic volume were obtained after annealing at 750 ℃ for 5 min. The submicron/nanometer microstructure with grain size <500 nm of the 304 austenitic stainless steel can be obtained by cryogenic rolling and annealing treatment. Comprehensive mechanical properties better than those under solid solution state can be obtained by annealing above 700 ℃. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |
渝公网安备 50010702501719号