锻压技术

高应变速率对IF钢力学性能及断口形貌的影响

英文标题：Influence of high strain rate on mechanical properties and fracture morphology for IF steel

作者：杨晨李伟

分类号：TG142.1+2

出版年,卷(期):页码：2025,50(8):275-282

摘要：

应变速率对不同材料的力学性能、塑性特征等影响规律差异较大，选取无间隙原子钢DX54D+Z作为研究对象，分析高应变速率对力学性能和组织特征的影响。采用液压伺服高速拉伸试验机，测试0.001~1000 s-1范围内7种应变速率下的IF钢的力学性能；分析试样断口的形貌特征和组织变化。结果表明：DX54D+Z钢表现出明显的应变速率正相关性,材料强度随着应变速率的提升明显增强，屈强比则基本不变，在0.576左右，均匀伸长率和断后伸长率整体呈现先增加后减小的趋势；各试样断口呈现典型的韧性断裂，韧窝深度和密度随着应变速率的增加而增大；试样的裂纹首先萌生于铁素体晶界处，随着距断口距离的增加，裂纹的数量和密度逐渐减少，铁素体的拉伸变形也逐渐减弱。

The influence laws of strain rate on the mechanical properties and plastic characteristics of different materials are quite different. The interstitial free steel DX54D+Z was selected as the research object to analyze the influence of high strain rate on the mechanical properties and microstructure characteristics. The mechanical properties of IF steel at seven strain rates in the range of 0.001-1000 s-1 were tested by the hydraulic servo high-speed tensile testing machine. The fracture morphology feature and micro-structure of each sample were analyzed. The results show that DX54D+Z steel exhibits a significant positive strain rate correlation. With the increasing of strain rate, the material strength is obviously enhanced, the yield-to-tensile ratio remains basically unchanged at about 0.576, and the uniform elongation and elongation after fracture generally show a trend of first increasing and then decreasing. The fracture of each sample presents typical ductile fracture, and the depth and density of dimples increase with the increasing of strain rate. The cracks of sample first initiate at the ferrite grain boundary, as the distance from the fracture increases, the number and density of cracks gradually decrease, and the tensile deformation of ferrite also weakens gradually.

基金项目：

河南省高等学校重点科研项目（23B460010,21B460020)；河南省本科高校青年骨干教师培养计划资助项目（2023GGJS186）

作者简介：杨晨（1983-），女，硕士，副教授 E-mail：854130919@qq.com

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