异步热轧对低合金钢显微组织及力学性能的影响

发布时间：2018-05-10 14:34

本文选题：异步热轧 + 同步热轧　；参考：《东北大学学报(自然科学版)》2017年07期

【摘要】：分别采用同步热轧及异速比为1.2的异步热轧对低合金钢进行热轧,研究异步热轧对低合金钢显微组织及力学性能的影响机制.结果表明,与同步热轧相比,异步热轧可显著促进低合金钢奥氏体/铁素体相变,提高热轧钢板厚度方向的组织均匀性.同步热轧工艺下,钢板表层为细晶铁素体层,厚度1/4或1/2处组织为粗大的贝氏体.异步热轧工艺下,钢板板厚方向主要为均匀的铁素体组织.两种热轧条件下,实验钢的抗拉强度和延伸率相当,分别为710~718 MPa和20%.采用异步热轧代替同步热轧后,实验钢的屈服强度由526MPa提高至561 MPa.这主要是由于同步热轧的钢板相变强化占主导,而异步热轧的钢板细晶强化相对较强.
[Abstract]:The influence mechanism of asynchronous hot rolling on microstructure and mechanical properties of low alloy steel was studied by synchronous hot rolling and asynchronous hot rolling with different speed ratio of 1.2. The results show that asynchronous hot rolling can significantly promote austenite / ferrite transformation in low alloy steel compared with synchronous hot rolling and improve the microstructure uniformity in thickness direction of hot rolled steel. In the process of simultaneous hot rolling, the surface layer of the steel plate is fine grain ferrite layer, and the microstructure at 1 / 4 or 1 / 2 thickness of the steel plate is coarse bainite. In the asynchronous hot rolling process, the thickness direction of steel plate is mainly homogeneous ferrite structure. Under two hot rolling conditions, the tensile strength and elongation of the experimental steel are the same, which are 710 ~ 718 MPa and 20% respectively. After synchronous hot rolling was replaced by asynchronous hot rolling, the yield strength of the experimental steel was increased from 526MPa to 561MPa. This is mainly due to the dominant phase transformation strengthening of synchronous hot rolled steel plate, while the fine grain strengthening of asynchronous hot rolled steel plate is relatively strong.
【作者单位】：东北大学轧制技术及连轧自动化国家重点实验室;
【基金】：国家自然科学基金资助项目(51204052)
【分类号】：TG142.33;TG335.11

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