【作者】 朱正海； 仇圣桃；

【Author】 Zhenghai Zhu~1,Shengtao Qiu~2 1 College of Metallurgy and Resources,Anhui University of Technology,MaanshanAnhui 243002, China; 2 National Engineering Research Center of Continuous Casting Technology,Central Iron and Steel Research Institute,Beijing 100081,China;

【机构】 安徽工业大学冶金与资源学院； 钢铁研究总院连铸中心；

【摘要】 通过微合金钢铸坯中析出相行为的试验研究,结合铸坯组织演变与热应力变化对微合金钢热送裂纹的形成机理进行了分析讨论。结果表明:铸坯输送方式的不同以及装炉温度的变化对装炉时铸坯中析出相的行为具有显著影响。微合金钢热送裂纹是在析出相行为、组织演变和热应力变化三者的合力作用下形成的,其中主导作用的是铸坯组织的演变,即两相区中奥氏体晶界先其析铁素体网膜的生成,其为微合金钢中析出相粒子沿奥氏体晶界的析出以及热送裂纹的形成提供了条件。更多还原

【Abstract】 Based on experimental investigation of precipitates behavior,formation mechanism on hot delivery crack of microalloy steel was analyzed by binding microstructure evolution and thermal stress changing.The results show that different conveied way and different hot charging temperature are effect significantly on precipitates behavior in charging slab.The hot delivery crack of microalloy steel was formed by resultant force of precipitates behavior,microstructure evolution and thermal stress changing. The microstructure evolution that it is the formation of pro-eutectoid ferrite omentum on austenitic grain boundaries in Ar1~Ar3 is the leading role on formation of hot delivery crack.It is supply conditions for precipitated particles distributed along the austenitic grain boundaries and formation of hot delivery crack of microalloy steel.更多还原