摘要
以钛微合金化的355 MPa级低合金高强度钢为研究对象,将试验钢分别在830、800、750、700℃系列温度下终轧,研究了终轧温度对显微组织和力学性能的影响。结果表明,随着终轧温度的降低,屈服强度和抗拉强度呈现不断升高的趋势,伸长率和冲击性能呈现先升高后下降的趋势,在A_(r3)温度附近终轧,钢板可获得最佳的综合力学性能。不同终轧温度下钢板基体组织均为铁素体+珠光体,在800℃终轧钢板晶粒最为均匀细小,830℃终轧钢板晶粒较800℃终轧相对粗大,750℃终轧钢板组织出现混晶现象,700℃终轧时,钢板晶粒已经拉长变形,一定程度上出现“纤维状铁素体”。充分细化晶粒可以减轻钢板中的带状组织。
Taking the Ti-microalloyed 355 MPa grade low-alloy high-strength steel as the research object,the test steels were subjected to finish rolling at 830,800,750,and 700℃respectively,and the effects of finish rolling temperature on the microstructure and mechanical properties were studied.The results show that,as the finish rolling temperature decreases,the yield strength and tensile strength show an increasing trend,and the elongation and impact properties show a trend of first increasing and then decreasing.Finish rolling near A_(r3) temperature,the steel plate can obtain the best comprehensive mechanical properties.The matrix structure of Q355 B steel sheet at different finish rolling temperatures is ferrite+pearlite.The grains of finish rolled steel plate at 800℃.are the most uniform and fine,and the grains of finish rolled steel plate at 830℃are relatively coarser than those of finish rolled at 800℃.Mixed crystals appear in the microstructure of finish rolled steel plate at 750℃,during the finish rolling at 700℃,the grains of steel plate have been elongated and deformed,and"fibrous ferrite"appears to a certain extent.Fully refined grains can reduce the band structure in the steel plate.
作者
陈建超
庞洪轩
温超
赵波涛
CHEN Jian-chao;PANG Hong-xuan;WEN Chao;ZHAO Bo-tao(Technology Center,Hebei Puyang Iron and Steel Co.,Ltd.,Handan 056305,Hebei,China;Medium Plate Factory,Hebei Puyang Iron and Steel Co.,Ltd.,Handan 056305,Hebei,China)
出处
《中国冶金》
CAS
北大核心
2021年第10期30-33,共4页
China Metallurgy
