汽车大梁用钢板冲压开裂分析
|
摘要
汽车大梁用热轧510 MPa级钢板在冲压过程中开裂。检测了开裂钢板的硬度、显微组织和力学性能,以揭示其开裂的原因。检测发现:开裂钢板厚度方向不同部位的塑性不同,因而变形性也有差异,导致其冲压时开裂。此外,模具圆角半径过小,且钢板表层有夹杂物,加剧了裂纹的扩展。
A batch of hot-rolled 510 MPa grade steel plates used for automotive girder cracked during stamping. The hardness,microstructure and mechanical properties of the cracked plate were detected to reveal the cause for its cracking. From the detection it was found that different positions below surface of the plate differed in plasticity as well as in deformability,thus resulting in their cracking during stamping. In addition,corner radius of the die was too small,and there were inclusions in skin of the plate,which promoted expansion of cracks.
A batch of hot-rolled 510 MPa grade steel plates used for automotive girder cracked during stamping. The hardness,microstructure and mechanical properties of the cracked plate were detected to reveal the cause for its cracking. From the detection it was found that different positions below surface of the plate differed in plasticity as well as in deformability,thus resulting in their cracking during stamping. In addition,corner radius of the die was too small,and there were inclusions in skin of the plate,which promoted expansion of cracks.
引文
[1]陈其源,刘振宇,周晓光,等.热轧汽车大梁钢生产现状及其发展趋势[J].轧钢,2016,33(2):51-55.
[2]孟宪堂,王小勇,李瑞恒,等.首钢热轧汽车大梁钢冲压开裂原因分析[J].物理测试,2014,32(6):31-36.
[3]徐礼玲. BM510L汽车大梁钢板冷弯开裂的显微分析[J].物理测试,2005,23(5):53-55.
[4]郭亚婷,王福明,黄泉金,等. 510L钢汽车大梁冷弯开裂研究[J].金属热处理,2015,40(6):190-194.
[5]于洋,孟宪堂,王林,等. 750 MPa级高强汽车大梁钢冲压开裂原因及机制[J].钢铁,2014,49(4):54-57.
[6]郑东升,朱伏先,李艳梅,等.含钒汽车大梁钢P510L连续冷却时的组织转变[J].东北大学学报(自然科学版),2009,30(5):665-668.
[2]孟宪堂,王小勇,李瑞恒,等.首钢热轧汽车大梁钢冲压开裂原因分析[J].物理测试,2014,32(6):31-36.
[3]徐礼玲. BM510L汽车大梁钢板冷弯开裂的显微分析[J].物理测试,2005,23(5):53-55.
[4]郭亚婷,王福明,黄泉金,等. 510L钢汽车大梁冷弯开裂研究[J].金属热处理,2015,40(6):190-194.
[5]于洋,孟宪堂,王林,等. 750 MPa级高强汽车大梁钢冲压开裂原因及机制[J].钢铁,2014,49(4):54-57.
[6]郑东升,朱伏先,李艳梅,等.含钒汽车大梁钢P510L连续冷却时的组织转变[J].东北大学学报(自然科学版),2009,30(5):665-668.