摘要
采用光学显微镜(OM)、扫描电镜(SEM)、电子探针(EPMA)等方法,对不同热处理温度下2.0 GPa级热成形钢显微组织与力学性能进行表征与分析。结果表明:随着奥氏体化温度的提高,屈服强度和抗拉强度呈现上升趋势,而断后伸长率呈现先升高后下降的趋势。经过890℃保温370 s,以100℃/s冷速淬火至室温,可获得抗拉强度2 025 MPa,断后伸长率10.2%,强塑积达到20.66 GPa%的良好性能。随着奥氏体化温度提高,可降低C、Mn元素偏析程度,改善马氏体带状组织,避免马氏体带状组织引起不协调变形,延缓产生裂纹源与提高材料塑性。
Optical microscope(OM),scanning electron microscope(SEM)and electron probe(EPMA)were used to characterize and analyze the microstructure and mechanical properties of a 2.0 GPa hotformed steel heat-treated by different heat treatment temperature.The results show that the yield strength and tensile strength increased with the increase in austenitizing temperature,while the elongation after fracture increased to a maximum and then decreased.After holding at 890℃for 370 s,and quenching to room temperature at a cooling rate of 100℃/s,a steel with the tensile strength of 2025 MPa,the 10.2%elongation after fracture and the 20.66 GPa%strength-plastic product can be obtained.As the austenitization temperature increases,the segregation degree of C and Mn elements can be reduced,and the martensite band structure can be improved.In the meanwhile,the uncoordinated deformation caused by the martensite band structure can be avoided,and thus the occurrence of crack sources can be delayed,as well as the plasticity can be improved.
作者
薛仁杰
曹晓恩
赵林林
刘鹏
高云哲
Xue Renjie;Cao Xiao’en;Zhao Linlin;Liu Peng;Gao Yunzhe(Technology Research Institute,HBIS Group,Shijiazhuang 050000,Hebei,China;Technology Center,Handan Company,HBIS Group,Handan 056015,Hebei,China)
出处
《钢铁钒钛》
CAS
北大核心
2023年第2期167-172,共6页
Iron Steel Vanadium Titanium
关键词
热成形钢
奥氏体化温度
显微组织
强塑性
元素富集
hot-formed steel
austenitizing temperature
microstructure
strength plasticity
element enrichment
作者简介
薛仁杰,1987年出生,男,工程师,硕士,主要从事汽车板产品开发及应用技术研究,E-mail:jierenxue@126.com;通讯作者:刘鹏,1989年出生,男,工程师,硕士,主要从事冷轧高强钢产品开发及应用技术研究,E-mail:liupeng@hbisco.com。
