白韶斌,盛剑,李大赵,等.退火-回火和回火-退火工艺对冷轧10Mn钢显微组织及力学性能的影响[J].精密成形工程,2024,16(11):82-90.
BAI Shaobin,SHENG Jian,LI Dazhao,et al.Effects of Annealing-tempering and Tempering-annealing Processes on Microstructure and Mechanical Properties of Cold-rolled 10Mn Steel[J].Journal of Netshape Forming Engineering,2024,16(11):82-90. |
| 退火-回火和回火-退火工艺对冷轧10Mn钢显微组织及力学性能的影响 |
| Effects of Annealing-tempering and Tempering-annealing Processes on Microstructure and Mechanical Properties of Cold-rolled 10Mn Steel |
| 投稿时间：2024-07-06 |
| DOI：10.3969/j.issn.1674-6457.2024.11.010 |
| 中文关键词: 中锰钢 κ-碳化物 奥氏体 马氏体转变 力学性能 强化机制 |
| 英文关键词: microstructures of samples under various conditions:a) cold-rolled sample b) tempering c) tempering-annealing d) annealing e) annealing-tempering |
| 基金项目:国家自然科学基金(52205402，52375392，52071300);山西省基础研究计划青年项目(202203021212318，20210302124044);冲击环境材料技术重点实验室基金(6142902240502) |
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| 中文摘要: |
| 目的 研究退火-回火和回火-退火工艺对冷轧Fe-10.2Mn-2.2Al-0.41C-0.6V(质量分数)中锰钢显微组织和力学性能的影响，明晰上述2种工艺对奥氏体体积分数、晶粒尺寸及稳定性的影响规律，以及显微组织与力学性能的关联机制。方法 在退火温度(600 ℃)、退火时间(30 min)和回火温度(550 ℃)、回火时间(30 min)一致的情况下，调整退火和回火工艺顺序，分析退火-回火和回火-退火工艺下组织与性能共通性及差异性。结果 2种工艺对试验钢的奥氏体体积分数、晶粒尺寸及稳定性影响不大;变形前后的奥氏体转换率分别为88%(退火-回火试样)和86%(回火-退火试样)，即奥氏体在变形阶段通过TRIP(Transformation-induced Plasticity)效应对2种试验钢力学性能的贡献无显著区别。退火-回火试样具有1 320 MPa屈服强度、1 435 MPa抗拉强度以及4.1%断后伸长率;回火-退火试样的屈服强度为1 200 MPa、抗拉强度为1 360 MPa、断后伸长率为6.6%。除了奥氏体的TRIP效应外，退火-回火试样中预先存在的马氏体是其较高抗拉强度的决定性因素，而回火-退火试样中的大量高角度晶界是其具有较好塑性的主要原因。此外，两试样的屈服强度差异主要与织构强化有关。结论 退火-回火工艺有利于中锰钢强度的提高，而回火-退火工艺有利于中锰钢塑性的提升。 |
| 英文摘要: |
| The work aims to study the effects of anneal-tempering and tempering-annealing processes on the microstructure and mechanical properties of cold-rolled Fe-10.2Mn-2.2Al-0.41C-0.6V (wt%) medium Mn steel, so as to further reveal the effect of the above processes on austenite volume fractions, grain sizes, and stability, as well as the correlation between microstructure and mechanical properties. The variations of microstructure and mechanical properties in the steel with the sequential change of annealing (600 ℃, 30 min) and tempering (550 ℃, 30 min) processes were analyzed. The results showed that the sequential change had few effects on the austenite volume fraction, grain size and stability. The austenite transformation rates before and after straining were evaluated to be 88% (annealed-tempered sample) and 86% (tempered-annealed sample), respectively. Namely, there was no significant difference about the contribution of TRIP effects on mechanical properties of the two studied steels. The yield strength, tensile strength, and total elongation of the annealed-tempered sample were 1 320 MPa, 1 435 MPa, and 4.1%, respectively. The tempered-annealed sample exhibited a yield strength of 1 200 MPa, tensile strength of 1 360 MPa, and total elongation of 6.6%. In addition to the TRIP effect of austenite, the pre-existing martensite in the annealed-tempered sample played an essential role in its high tensile strength, while a large fraction of high-angle grain boundaries in the tempered-annealed sample contributed to the good ductility. Besides, the difference of yield strength between the two samples was closely related to the texture strengthening. Based on this study, it is concluded that the annealing-tempering and tempering-annealing processes are favorable to enhance the strength and plasticity of medium Mn steels, respectively. |
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