Cr13系铸造马氏体不锈钢铌和碳的合理配比关系  

Reasonable proportioning relationship between Nb and C of Cr13 series casting martensitic stainless steel

作　　者：金洋帆[1] 臧其玉 张拓 杨弋涛[1] JFN Yang-fan;ZANG Qi-yu;ZHANG Tuo;YANG Yi-tao(School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海大学材料科学与工程学院,上海200444

出　　处：《钢铁》2019年第3期87-95,共9页Iron and Steel

摘　　要：铌作为常用的微合金元素,常被用于细化晶粒、改善钢的强度与韧性,而在不锈钢中关于铌与碳化物质量分数的定量关系以及铌和碳的合理配比的研究工作尚不够深入。通过对不同铌质量分数的1Cr13与3Cr13马氏体不锈钢的组织、碳化物质量分数等进行观察和测量,总结出了比较合理的C-Nb关系式以及这两种元素对碳化物质量分数的影响的定量关系,并结合文献提出了铌元素对Cr13系列马氏体碳化物沉淀的影响原理。结果表明,铌会促进碳化物的沉淀并改变碳化物的成分(碳化物中出现铌元素),并且随着铌质量分数的增加,Cr13系列马氏体不锈钢中的碳化物都出现了指数型增长。得出Cr13系列马氏体不锈钢中碳化物的质量分数与碳和铌的质量分数存在指数型关系,同时合理的C-Nb关系配比呈线性。As a common micro-alloying element,Nb element is often used to refine the grain to improve strength and toughness of steel. However,the study on the quantitative relationship between Nb element and carbide mass percent and the reasonable ratio of Nb and C in stainless steel is not enough. The way Nb mass percent effect on the microstructure and carbides of 1 Cr13 and 3 Cr13 was observed and analyzed,a reasonable equation of C-Nb relation and the influence of these two elements on carbide mass percent of quantitative relationship have been obtained. Experiment results show that Nb elements can promote the precipitation of carbide and changing the composition of carbides(Nb element can be found in carbides). By the way,with the increase of Nb mass percent,the carbide in Cr13 series martensitic stainless steel increases exponentially. Finally,the mass percent of carbide and the mass percents of C and Nb in Cr13 series martensitic stainless steels has an exponential relationship. At the same time,the reasonable ratio of C-Nb relationship is linear.

关 键 词：铌 硬度 显微组织 碳化物 马氏体不锈钢 

分 类 号：TG142.71[一般工业技术—材料科学与工程]