摘要
通过建立合理的热处理工艺窗口,将低附加值的钢种升级为具有高强塑性的高附加值双相钢产品.以常规C-Mn钢热轧板坯为原料,经过热轧及冷轧后,进行连续退火实验.实验钢经过不同的冷却后过时效制度,形成了铁素体和马氏体组成的微观组织.当过时效温度在320℃以下时,避免了贝氏体组织的出现,并且马氏体相的体积分数随温度的降低而增加.实验钢的抗拉强度与马氏体相含量成正比,屈服强度和延伸率与其成反比,在320℃过时效处理下可获得最佳的综合力学性能,强塑积为18 254.6 MPa%.
A high strength and ductility dual phase steel was developed from the traditional steel via establishing reasonable processing parameter windows, which transferred from low to high additional values. The continuous annealing specimen was prepared from C-Mn steels by hot and cold rolling. The microstructure contained ferrite and martensite was obtained by the intercritical anneal, controlled cooling and the subsequent different over-aging procedures. The bainite transformation was avoided when the over-aging temperature was lower than 320 ℃. The volume fraction of the martensite increased with the decrease of temperatures. The tensile strength was proportional to the volume fraction of the martensites, whereas the yield strength and elongation performanced an inverse relationship. The strength-ductility balance was 18 254.6 MPa% in the 320 ℃ over-aging procedure as a better mechanical property.
出处
《东北大学学报(自然科学版)》
EI
CAS
CSCD
北大核心
2014年第3期375-378,共4页
Journal of Northeastern University(Natural Science)
基金
中央高校基本科研业务费专项资金资助项目(N090307004
N110307003)
关键词
双相钢
低成本
连续退火
过时效温度
组织性能
dual phase steels
low cost
continuous anneal
over-aging temperature
microstructure and mechanical properties