摘要
添加多元微量合金元素V、Ti、Nb和Mo到2.8C-31Cr合金中制备多元铬系合金,从合金热力学析出角度,通过计算分析Ti、V、Nb在多元体系中的存在方式,探讨添加的合金元素对高铬铸铁凝固组织中碳化物析出的影响。结果表明,Ti和Nb在高铬铸铁凝固过程中主要形成Ti C和Nb C,V主要存在于合金化合物VCr2C2和VCr Fe8中。先析出的Ti C和Nb C能充当碳化物异质形核基底,增加形核率使组织细化。但添加过量的合金元素却削弱了对碳化物的细化作用。
The chromium alloy was prepared from 2. 8wt% carbon and 31. 0wt% chromium by the additions of trace multi-alloying elements( Ti,Nb,V,Mo). The existence forms of Ti,Nb,V in multicomponent system were studied by calculation from the alloy thermodynamic consideration. The effect of additions of alloy elements on carbides precipitation behavior of high chromium cast iron was investigated. The results show that Ti and Nb exist in the multi-alloying system in forms of Ti C and Nb C during solidification. V element exists mainly in alloy compounds( VCr2C2,VCr Fe8). The first precipitated high melted point particles( Ti C,Nb C) during cooling can act as the heterogeneous nuclei of M7C3 carbides,As a result,the increase of nucleation rate results in refined M7C3 carbides morphology. However,the addition of excess alloy elements weakens the roles of M7C3 carbides refinement.
出处
《金属热处理》
CAS
CSCD
北大核心
2015年第7期78-81,共4页
Heat Treatment of Metals
基金
国家自然科学基金项目青年基金(51301115)
四川省教育厅项目(14ZB0218)
四川理工学院人才引进项目(2013RC06)
四川理工学院校级培育项目(2012PY06)
关键词
高铬铸铁
热力学
动力学
多元微合金化
high chromium cast iron
thermodynamic
kinetics
trace multi-alloying