摘要
以C-Si-Mn和Ti微合金化C-Si-Mn-Cr-Mo两种成分体系DP1000为研究对象,针对座椅骨架制管后压扁工序时两种材料不同开裂报废率,对两种成分体系DP1000的压扁开裂的原因和机理进行了分析。结果表明,与Ti微合金化C-Si-Mn-Cr-Mo成分体系DP1000组织中细小而弥散马氏体相比,C-Si-Mn成分体系的DP1000具有更为粗大的块状马氏体,马氏体的体积分数大约为45%,其组织中还存在带状组织;此外C-Si-Mn成分体系DP1000比Ti微合金化C-Si-Mn-Cr-Mo成分体系DP1000具有更高的伸长率和更低的屈强比;Ti微合金化C-Si-Mn-Cr-Mo成分体系DP1000的扩孔率为55.6%,大约是C-Si-Mn成分体系DP1000的10倍,因此粗大的马氏体、带状组织、低的扩孔率和折弯性能是C-Si-Mn成分体系DP1000具有较高压扁开裂率的主要原因。
Taking C-Si-Mn DP1000 steel and Ti added microalloyed C-Si-Mn-Cr-Mo DP1000 steel as the study subject,according to the different rejection rate of the two materials used for manufacturing seat frame after a flattening procedure,the cause and mechanism of cracking for the two DP1000 steels are analyzed. For Ti added microalloyed C-Si-MnCr-Mo DP1000 steel,the martensite in the microstructure is fine and diffuse. While,the microstructure of C-Si-Mn DP1000 steel contains bulk martensite and band structure,and the volume fraction of martensite is around 45%. Furthermore,compared with Ti added microalloyed C-Si-Mn-Cr-Mo DP1000 steel,C-Si-Mn DP1000 steel has a higher elongation and lower yield ratio. The hole expansion ration of Ti added microalloyed C-Si-Mn-Cr-Mo DP1000 steel is about55.6%,which is about ten times of C-Si-Mn DP1000 steel. Therefore,the bulk martensite,band structure,low hole expansion ratio and bending properties are the main reason for the higher fracture ration of C-Si-Mn DP1000 steel.
作者
刘华赛
吴耐
李振
韩赟
LIU Hua-sai;WU Nai;LI Zhen;HAN Yun(Shougang Group Co.,Ltd.Research Institute of Technology,Beijing 100043,China;Beijing Key Laboratory of Green Recyclable Process for Iron and Steel Production Technology,Beijing 100043,China;Beijing Shougang Co.,Ltd.,Beijing 101304,China)
出处
《物理测试》
CAS
2018年第6期35-40,共6页
Physics Examination and Testing
基金
国家重点研发计划专项资助项目:高性能超高强汽车用钢(2017YFB0304401)
关键词
连续退火
DP1000
压扁开裂
带状组织
扩孔率
折弯
continuous annealing
DP 1000
flattening cracking
band structure
hole expansion
bending
