锰质量分数和压缩比对中碳钢相变组织的影响  

Effect of manganese content and compression ratio on microstructure of medium carbon steel

作　　者：敖永明 李成良 黄远坚 温志红 

机构地区：[1]宝钢集团广东韶关钢铁有限公司,广东韶关512123

出　　处：《连铸》2017年第3期78-82,共5页Continuous Casting

摘　　要：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 and morphology of medium carbon steel were observed with optical microscope and EPMA,analysis the effect of manganese content and compression ratio on microstructure.The results indicate that the microstructure of tested steel is ferrite and pearlite,which have different morphology;The increase of manganese content depress grain boundary ferrite uncleation and growth,refine ferrite grains and promote the degenerated pearlite formation;The increase of compression ratio promote the honeycomb-ferrite formation,which separates austenite grain and has same direction with grain boundary ferrite;The inclusions of Mn S or complex inclusion contains Mn S enhance the nucleation of intragranular ferrite evidently.

关 键 词：中碳钢 冷却速率 压缩比 显微组织 

分 类 号：TG142.1[一般工业技术—材料科学与工程]