Study on the Anisotropy of Microstructure and Tensile Behavior of 500 MPa Grade High Strength Low Alloy Steel
WANG Chaobin1, MU Zhenkai2, ZHANG Shijie1, NIE Qiangsheng1, AN Fangliang1, JIANG Jun1, WANG Shuokang1, LIU Shishuang1,*, ZHOU Jiming1,*
1 Shougang Jingtang United Iron and Steel Co., Ltd., Tangshan 063200, Hebei, China 2 School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China
Abstract: This work mainly studies the anisotropy of microstructure and tensile behavior of 500 MPa grade high strength low alloy steel (HSLA steel) for automotive structural components. Microstructure, texture, tensile properties, and fracture behavior of CR500LA alloy specimens with rolling directions of 0°, 45°, and 90° were studied by means of scanning electron microscopy (SEM), tensile testing machines, and other equipment. The anisotropy of CR500LA alloy was predicted using the Hill48-σ, Hill48-r, and Yld2000-2d yield criteria. The results indicate that the alloy is mainly composed of ferrite and pearlite. The main types of textures are {111}〈110, {111}〈112〉, {001}〈110〉, and {112}〈110〉, with the α fiber texture {112}〈110〉 being the predominant. As the angle with the rolling direction increases, the tensile strength first decreases and then increases, while the plasticity and r-value first increase and then decrease. The anisotropy of alloys is mainly caused by differences in texture types and its proportions. Yld2000-2d yield model provides more accurate predictions for the anisotropy of CR500LA alloy. Tensile fracture is a typical ductile fracture composed of a large number of dimples.
王朝斌, 穆振凯, 张士杰, 聂强胜, 安方亮, 姜军, 王硕康, 刘石双, 周纪名. 500 MPa级低合金高强钢组织与拉伸行为的各向异性研究[J]. 材料导报, 2026, 40(3): 25010112-7.
WANG Chaobin, MU Zhenkai, ZHANG Shijie, NIE Qiangsheng, AN Fangliang, JIANG Jun, WANG Shuokang, LIU Shishuang, ZHOU Jiming. Study on the Anisotropy of Microstructure and Tensile Behavior of 500 MPa Grade High Strength Low Alloy Steel. Materials Reports, 2026, 40(3): 25010112-7.
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2026, Vol. 40 
