Q&P工艺对60Mn2SiCr钢中超级贝氏体组织转变的影响  

Effect of Q&P process on transformation of super-bainite microstructure in 60Mn2SiCr steel

作　　者：郭明阳[1] 吴化[1] 修文翠[1] 韩英[1] 李欣红[1] 刘云旭[1] 

机构地区：[1]长春工业大学先进结构材料省部共建教育部重点实验室,吉林长春130012

出　　处：《材料热处理学报》2015年第12期168-172,共5页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51171030)

摘　　要：采用电子显微分析方法及X射线衍射技术等研究了"淬火+分配"热处理工艺(Quenching and partitioning,简称Q&P工艺)对60Mn2Si Cr钢组织转变的影响。结果表明,由于Q&P工艺处理过程中少量马氏体组织所带来的晶体缺陷,有利于非均匀形核,在促进超级贝氏体生成的同时还细化了组织;同时,由于碳在α相中具有高的化学势,引起产生自少量马氏体组织中的排碳,以及贝氏体铁素体形成时碳的短程扩散,导致残留奥氏体中碳含量有所增加,稳定性提高。其效果将会有利于改善超级贝氏体组织的强韧性。Effect of quenching and partitioning （Q＆P） process on microstructure evolution of 60Mn2SiCr steel was studied by transmission electron microscopy and X-ray diffraction. The results show that the crystal defects caused by a small amount of martensite during the Q＆ P process are beneficial to the heterogeneous nucleation of bainitic ferrite, which can promote the tbrmation of super-bainite and Ihe refinement of microstructure. Meanwhile, the carbon expelling from the obtained martensite due to its high chemical potential in α-phase and the short-range diffusion of carbon during the bainitic-ferrite formation leads to increase of the carbon content and the stabilily enhancement of retained austenite. The strength and toughness of super-bainite microstructure could be improved by the Q＆P process.

关 键 词：Q&P工艺 超级贝氏体 热力学 

分 类 号：TG142.1[一般工业技术—材料科学与工程]