OALib Journal期刊
时效处理对极低碳针状铁素体钢组织和力学性能的影响
, PP. 390-395
Keywords: 极低碳钢 ,针状铁素体 ,时效 ,ε--Cu ,沉淀
Abstract:
利用光学显微镜、扫描电镜和透射电镜研究了变温时效对极低碳针状铁素体钢组织和性能的影响规律.结果表明450---500℃时效处理时,第二相析出较少,组织无明显粗化,强度无明显变化;550---650℃时效时,强度快速上升,主要是ε--Cu和Nb(C,N)第二相粒子的弥散析出所致;650℃以上时效时,发生过时效现象,铁素体板条和第二相粒子粗化,导致强度迅速下降;时效温度达到750℃时进入两相区,局部富C和合金元素富集区域先奥氏体化,时效后冷却过程中形成了高碳的M/A组织,使钢的韧性迅速恶化.
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