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以汽车维修工具材料20Cr Mn Ti为研究对象,利用热压缩试验、等温锻造试验和拉伸试验分析了其力学性能随温度、锻造速率的变化规律。结果表明:在相同应变速率下,20Cr Mn Ti材料真应力随变形温度的升高而下降,热变形初期存在应变硬化现象;随着变形的增加,20Cr Mn Ti材料应力呈现下降趋势。随着锻造速率的降低,20Cr Mn Ti材料抗拉强度先上升,然后迅速下降;锻造速率为2.4×10-4s~(-1)时,试验材料可表现出较好的力学性能。
Taking 20Cr Mn Ti as a repair tool material, the change law of its mechanical properties with temperature and forging rate was analyzed by means of hot compression test, isothermal forging test and tensile test. The results show that the true stress of 20Cr Mn Ti material decreases with the increase of deformation temperature at the same strain rate, and strain hardening occurs in the initial stage of deformation. With the increase of deformation, the stress of 20Cr Mn Ti material presents a downward trend. With the decrease of forging rate, the tensile strength of 20Cr Mn Ti first increases and then decreases rapidly. When the forging rate is 2.4 × 10-4s -1, the mechanical properties of the 20Cr Mn Ti material can be improved.