20MnSiNb三级螺纹钢中异常组织的热处理矫正工艺研究

【作者】 吴隽； 高娟； 侯东凯； 陈亮； 师静蕊； 吴新杰； 张安利； 吴润；

【机构】 武汉科技大学材料与冶金学院金属材料工程系；

【摘要】 本文采用不同热处理工艺对具有粗大魏氏组织和严重网状铁素体的供货态20MnSiNb三级螺纹钢进行了热处理矫正处理,对其金相组织及力学性能进行了研究。其金相组织观察分析结果表明:随加热温度的升高,开始出现魏氏组织,且晶粒逐渐长大;拉伸试验结果表明:经一定热处理校正工艺处理的试样均出现了明显的屈服,其综合力学性能均达到了国家三级螺纹钢的相关标准及附加标准,处理后样品的断后伸长率、屈服强度σs以及抗拉强度σb分别达到35%,467MPa和656MPa。更多还原

【Abstract】 20MnSiNb,the third grade deformed steel bars with large Widmanstaten and serious network Ferrolites,was heated at A1、A2 and A3,after keeping for certain time at different temperate,then cooled at ambient temperature with a certain cooling speed.The results of metallographic analysis show that with the heating temperature arising,Widmanstaten structure generally appears and grows largely. The tensile test results show that the yield point elongation appears again for the samples after heating at a temperature lower than A3 and the mechanical properties agree with the state standards forⅢgrade deformed steel bars,and,the optimal one is obtained for the samples treated at A1,that is the values of elongation, the yield strength and the tensile strength are at 35%,467MPa and 656MPa,respectively.更多还原