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采用光学显微镜和电子探针观察了中碳钢显微组织形貌,分析了不同锰质量分数和轧制压缩比对相变组织的影响。研究表明:试验钢显微组织为形态不同的铁素体+珠光体;增加Mn质量分数抑制晶界铁素体形核和长大,同时细化铁素体晶粒,促进退化珠光体的形成;提高轧制压缩比有利于原奥氏体晶内蜂窝状铁素体的形成,该铁素体均匀的分割原奥氏体晶粒,与晶界铁素体具有相同的方向性;MnS或其复合夹杂物是铁素体在原奥氏体晶粒内部形核的有效位置。
The microstructure of medium carbon steel was observed by optical microscope and electron probe. The effects of different mass fraction of manganese and rolling compression ratio on phase transformation microstructure were analyzed. The results show that the microstructure of the test steel is ferrite + pearlite with different morphologies; increasing the mass fraction of Mn suppresses the nucleation and growth of grain boundary ferrite; meanwhile, the ferrite grains are refined to promote the formation of degenerate pearlite; Increasing the rolling reduction ratio is advantageous to the formation of the prior austenite intragranular honeycomb ferrite, which uniformly divides the prior austenite grains and has the same directivity as the grain boundary ferrite; MnS or Complex inclusions are the effective sites for ferrite to nucleate inside the original austenite grains.