锻压技术

预应变对高强度低合金钢性能和组织的影响

英文标题：Influence of pre-strain on properties and microstructure for high strength low alloy steel

作者：孔玉强李伟段朋

分类号：TG142.1

出版年,卷(期):页码：2024,49(4):219-225

摘要：

以高强度低合金钢HC340LA为研究对象，对其微观组织及力学性能进行了分析；对3个方向的单向拉伸试样分别施加0%、5%、10%、15%的预应变，卸载后进行二次拉伸至试样断裂，获取应力-应变曲线，并提取力学性能、加工硬化等关键参数，获取预应变的影响规律；对均匀变形区域的微观组织进行观察，获取预应变对组织的影响。结果表明：材料存在屈服平台和明显的吕德斯带；强度随着预应变的增加而增大；断后伸长率在5%预应变时有所下降，但随着预应变的继续增加则开始增大；瞬时加工硬化值随着预应变量的增大迅速降低，并且存在明显的变化差异；铁素体晶粒随预应变量的增加发生尺寸变化，而珠光体的尺寸并未发生明显变化，但随着铁素体的变形，其排布方向出现了变化。

For HC340LA high strength low alloy steel, its microstructure and mechanical properties were analyzed, and 0%, 5%, 10% and 15% pre-strains were applied to the uniaxial tensile samples in three directions,respectively. Then, after unloading, the samples were subjected to secondary stretching until the fracture of samples, and the stress-strain curves were obtained. Furthermore, the key parameters such as mechanical properties and work hardening were extracted to obtain the influence laws of pre-strain, and the microstructure of uniform deformation zone was observed to obtain the influence of pre-strain on the microstructure. The results show that there is a yield platform and obvious Lüders band. The strength of material increases with the increasing of pre-strain. The elongation after fracture decreases at the pre-strain of 5%, but it increases with the continued in creasing of pre-strain. The instantaneous work hardening value rapidly decreases with the increasing of pre-strain, and there is a significant difference in variation amount. The size of ferrite grains changes with the increasing of pre-strain amount. The size of pearlite does not show significant changes, but its arrangement direction changes with the deformation of ferrite.

基金项目：

河南省高等学校青年骨干教师培养计划资助项目(2023GGJS186);河南省高等学校重点科研项目（23B460010）

作者简介：孔玉强（1989-），男，硕士，讲师 E-mail：sxymtxy@163.com 通信作者：李伟（1983-），男，硕士，副教授 E-mail：249584256@qq.com

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