锻压技术

应变速率对低合金高强钢性能的影响

英文标题：Influence of strain rate on properties for low alloy high strength steel

作者：刘海娜1 梅运东1 刘领兵2

单位：（1.黄河交通学院机电工程学院河南焦作 454950 2.焦作市泰鑫机械制造有限责任公司河南焦作 454000）

分类号：U463.83

出版年,卷(期):页码：2023,48(6):253-257

摘要：

以低合金高强钢H300LA为研究对象，采用液压伺服高速拉伸试验机，选取应变速率为0.001、0.1、1、10、100、200、500、1000 s-1开展力学性能测试，获取不同应变速率下的屈服强度、抗拉强度和伸长率等性能参数，并通过积分力学曲线计算了不同应变速率下的断裂吸收能，分析了应变速率对材料性能的影响规律。采用扫描电子显微镜（Scanning Electron Microscope, SEM）分析了不同应变速率下的试样断口形貌和变化规律，获取了材料的断裂特性。结果表明：低合金高强钢H300LA的抗拉强度和伸长率与应变速率呈正相关，具有明显的应变速率敏感性；断裂吸收能随着应变速率的增加而增加；断口形貌均呈韧窝状，随着应变速率的增加，韧窝数量增加且尺寸增大。

For low alloy high strength steel H300LA, the mechanical properties were tested by hydraulic servo high-speed tensile testing machine at strain rates of 0.001, 0.1,1, 10, 100, 200,500 and 1000 s-1, and the yield strength, tensile strength and elongation under different strain rates were obtained. Then, the fracture absorption energy under different strain rates was calculated by integral mechanical curve, and the influence laws of strain rate on material properties were analyzed. Furthermore, the fracture morphology and change law of the test specimens under different strain rates were analyzed by scanning electron microscopy, and the fracture characteristics of the material were analyzed. The results show that the tensile strength and elongation of low alloy high strength steel H300LA are positively correlated with strain rate, and have obvious strain rate sensitivity. The fracture absorption energy increases with the increasing of strain rate, and the fracture morphology is dimple. As the strain rate increases, the number and the size of dimples increase.

基金项目：

河南省智能制造技术与装备工程技术研究中心项目（3118210370）

刘海娜（1984-），女，硕士，讲师

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