锻压技术

控轧控冷工艺对汽车减震器活塞杆用S45C钢盘条微观组织和力学性能的影响

英文标题：Influence of controlled rolling and controlled cooling process on microstructure and mechanical properties for S45C steel rod coil used in automobile shock absorber piston rods

作者：董庆1 2 3 张育明1 2 王冬晨4 李永超1 2 3 王宁涛1 2 3 张旭1 2

单位：1.河北邢钢科技有限公司 2.邢台钢铁有限责任公司 3.河北省线材工程技术创新中心 4.河北机电职业技术学院材料与建筑工程系

关键词：S45C钢控轧控冷工艺盘条微观组织力学性能

分类号：TG335.6

出版年,卷(期):页码：2023,48(10):15-153

摘要：

针对大规格S45C钢热轧盘条强度偏低和存在魏氏体组织问题，研究了控扎控冷工艺对盘条微观组织和力学性能的影响，对轧制过程中的加热温度、进精轧温度、卷取温度和冷却速度进行了优化调整，并对比分析了原工艺和优化工艺下S45C钢热轧盘条的微观组织和力学性能。结果表明：优化工艺后，热轧盘条的抗拉强度和硬度较原工艺明显增加，抗拉强度提高了21 MPa，硬度增加了3 HRB，同时伸长率和断面收缩率略有增加；优化工艺轧制的盘条的魏氏体组织基本消失，同时晶粒尺寸得到细化，晶粒度由7.0级增加为8.0级，珠光体片层变薄且片层间距减小，由0.33 μm缩小至0.26 μm。优化工艺通过降低加热温度和轧制温度以及控制冷却方式，提高了S45C钢热轧盘条的强度，改善了魏氏体组织。

For the problems of low strength and Widmanstatten structure of large-sized S45C steel hot-rolled rod coil, the influence of controlled rolling and controlled cooling on the microstructure and mechanical properties of rod coil was studied. The heating temperature, finisher entry temperature, coiling and controlled cooling temperature and cooling rate in the rolling process were optimized and adjusted, and the microstructure and mechanical properties of S45C steel hot-rolled rod coil under the original process and the optimized process were compared and analyzed. The results show that the tensile strength and hardness of the hot-rolled rod coil increase significantly after optimizing the process, increasing by 21 MPa and 3 HRB, respectively, while the elongation and section shrinkage increase slightly. The Widmanstatten structure of the rod coil rolled by the optimized process is basically disappeared, and the grain size is refined, the grain size increases from 7.0 grade to 8.0 grade.The pearlite lamellae is thinner and the lamellae spacing is reduced from 0.33 μm to 0.26 μm. By reducing the heating temperature and rolling temperature and controlling the cooling method, the strength of S45C steel hot-rolled rod coil is improved, and the Widmanstatten structure is improved.

基金项目：

董庆（1982-），男，硕士，高级工程师 E-mail：badibt01@sina.com

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