摘要
对800MPa级热镀锌双相钢热轧、冷轧及退火后的显微组织进行了观察,分析比较了热轧和退火后的力学性能,并考察了其织构演变过程。结果表明：实验用钢经820℃保温140s热镀锌退火后,可获得抗拉强度819MPa,伸长率为17%的铁素体＋马氏体双相钢,铁素体晶粒尺寸在1.5~4μm之间,马氏体体积分数为34%左右;热轧织构密度较弱,但已呈现出γ织构的雏形;冷轧后α织构和γ织构密度显著增长;热镀锌退火后α织构变化不大,不利织构{001}〈110〉织构密度有较大程度地攀升,γ织构取向密度值波动很大,最大织构组分为{112}〈110〉织构;快冷过程中形成的马氏体阻碍了有利织构{111}的发展,使得不利织构{001}〈110〉得到一定程度的发展。
Microstructures of hot rolled,cold rolled and hot dip galvanized annealed samples were observed,mechanical properties of hot rolled and hot dip galvanized annealed samples were analyzed and compared.At the same time,process of texture evolution was studied.The results show that annealed at 820℃ and soaked 140s,the tensile strength and total elongation of hot dip galvanized dual phase steel reach 819MPa and 17% respectively with F＋M microstructure.The size of ferrite crystal grain is 1.5-4μm,the volume fraction of martensite is about 34%.The density of hot rolled texture is week,but γ-fiber texture is formed weekly;after cold rolling,α-fiber and γ-fiber texture both develop remarkably;after hot dip galvanized annealing,α-fiber texture changes very little,but {001}〈110〉 texture increases notably.The orientation density of γ-fiber texture greatly fluctuates,the texture component {112} 〈110〉 possesses of maximum amount.The martensite particle which is formed in the process of rapid cooling hinders the development of favorable texture {111},so it makes that the disadvantage texture {001} 〈110〉 has a great extent increasing.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2010年第9期40-44,共5页
Journal of Materials Engineering
基金
十一五国家科技支撑计划项目(2006BAE03A06)
北京市科技计划资助项目(D07010300700701)
关键词
热镀锌双相钢
显微组织
力学性能
织构
hot dip galvanized dual phase steel
microstructure
mechanical property
texture
