摘要
研究了不同退火制度下980 MPa级冷轧双相钢的微观组织和力学性能的影响。试验表明,热轧态的微观组织由铁素体、贝氏体和少量的马氏体组成,经过冷轧后形成纤维状组织。通过热模拟不同退火温度和保温时间下带钢微观组织与性能的变化,得出最佳的工艺制度:保温时间约为210 s,退火温度为780~820℃。带钢经退火温度为780℃、保温时间为210 s的热镀锌退火后,可以获得抗拉强度大于980 MPa的冷轧热镀锌双相钢。热镀锌退火后,扫描电镜下观察其室温组织为典型的铁素体+马氏体组织,在铁素体基体中观察到了含Mo元素的第二相,呈球状。
Influence of different annealing processes on mierostructure and mechanical properties of 980 MPa grade cold rolling hot dip galvanized dual phase steel was investigated. The result shows that the microstructure of hot roiled steel is composed of ferrite, martensite and bainite, having fibrous microstructure when cohl rolled. Based on the analysis of mierostrueture and properties of the steel at different annealing processes, the optimum parameter was 780-820 ℃ for annealing temperature and about 210 s for holding time, respectively. When annealed at 780 ℃ and soaked 210 s,the tensile strength of the hot dip galvanized dual phase steel reach 980 MPa. SEM observation reveals that the microstructure comsists of ferrite and martensitc after annealing. The second phase is also observed in ferrite matrix with Mo element.
出处
《金属热处理》
CAS
CSCD
北大核心
2017年第12期193-198,共6页
Heat Treatment of Metals
关键词
热镀锌双相钢
组织
力学性能
退火
hot dip galvanized dual phase sleel
microstrueture
mechanical properties
annealing
