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摘要：
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板料在实际成形过程中往往会经历比较复杂的应变路径，而应变路径的变化对TRIP钢的力学行为有很大的影响。采用两步拉伸的实验方法，研究了预应变和应变路径变化对TRIP钢抗拉强度、断裂伸长率的影响，并应用DIC方法对材料缩颈区及附近区域的应变进行测量，进一步分析应变路径变化对断裂伸长率的影响。结果表明：面内各向异性对TRIP钢的抗拉强度和断裂伸长率影响均不明显。预应变和应变路径变化对TRIP钢的抗拉强度基本无影响；但是预应变会增大TRIP钢的断裂伸长率，而且在一定预应变范围内，预应变越大断裂伸长率增加得越多。整体上随着二次加载角度的增大，断裂伸长率逐渐减小。DIC测量显示增大预应变会使TRIP钢的应变分布更加均匀，而增大二次加载的夹角会使应变分布更加集中。
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In the actual forming process, sheet metal often experiences a complex strain path, and the change of the strain path has a great influence on the mechanical behavior of TRIP steel. Then, the influences of pre-strain and strain path change on tensile strength and fracture elongation of TRIP steel were studied by the method of two-step uniaxial tension, and the strain of necking area and its surrounding area were measured by DIC method to further analyze the influence of strain path change on fracture elongation. The results show that the influences of in-plane anisotropy on tensile strength and fracture elongation of TRIP steel are not obvious, and pre-strain and strain path change almost have no effect on the tensile strength of TRIP steel. However, the fracture elongation of TRIP steel increases when pre-strain exists, and in a certain pre-strain range, the larger the pre-strain is, the greater fracture elongation increases. With the increase of second loading angle, the fracture elongation gradually decreases on the whole. DIC measurements show that strain distribution becomes more uniform in TRIP steel by increasing the pre-strain, but strain distribution becomes more concentrated with increasing the angle of second loading.
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基金项目：
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广东省自然科学基金资助项目（2016A030313453，2016A 030313519）
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作者简介：
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作者简介：张迎（1993-），男，硕士研究生
E-mail：1461833752@qq.com
通讯作者：周驰（1973-），男，博士，副教授
E-mail：mechzhou@scut.edu.cn
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