第三代汽车钢温热成形工艺研究及性能评价
发布时间：2018-09-12 11:14
【摘要】：中锰钢为最新的第三代汽车钢,其成形性和力学性能的改善是当前汽车轻量化领域的前沿课题。提出超细晶中锰钢的温热成形技术,通过科学优选奥氏体化温度、保温时间和成形温度作为工艺参数因子,采用正交试验和极差分析的方法,引入断裂韧度性能参数,综合评估抗拉强度、伸长率、撕裂强度及单位面积裂纹扩展能性能指标,得出温热成形中锰钢的最优工艺参数组合,即奥氏体化温度为810℃、保温时间为7 min、成形温度为550℃。并通过断口形貌和真实的汽车B柱冲压件,从微观结构和宏观性能角度验证了所得工艺参数的有效性。测试结果显示,当采用最优工艺参数组合时,具有均匀的断口形貌特征;微观结构具有细化的马氏体板条形貌,板条平均长度尺寸在2~3μm;宏观性能良好,抗拉强度均在1 400 MPa以上,具有较好的塑性和断裂韧度。研究结果表明,温热成形技术是有效的中锰钢冲压成形方法,为第三代汽车钢的温热成形实际应用起到积极的促进作用。
[Abstract]:Medium manganese steel is the newest third generation automobile steel. The improvement of its formability and mechanical properties is a frontier subject in the field of automobile lightweight. The warm forming technology of ultrafine grain manganese steel was put forward. The parameters of fracture toughness were introduced by orthogonal test and range analysis by selecting the austenitizing temperature, holding time and forming temperature as process parameters. Based on the comprehensive evaluation of tensile strength, elongation, tear strength and crack growth energy per unit area, the optimum process parameters of manganese steel in warm forming are obtained, that is, the austenitizing temperature is 810 鈩，
本文编号：2238833
[Abstract]:Medium manganese steel is the newest third generation automobile steel. The improvement of its formability and mechanical properties is a frontier subject in the field of automobile lightweight. The warm forming technology of ultrafine grain manganese steel was put forward. The parameters of fracture toughness were introduced by orthogonal test and range analysis by selecting the austenitizing temperature, holding time and forming temperature as process parameters. Based on the comprehensive evaluation of tensile strength, elongation, tear strength and crack growth energy per unit area, the optimum process parameters of manganese steel in warm forming are obtained, that is, the austenitizing temperature is 810 鈩，
本文编号：2238833
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