Distribution Characteristics of Alloy Elements in VC Particle Reinforced Composite Wear Resistant Alloy under Different Mn Contents
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摘要: 为了研发一种具有更高韧性的VCp增强复合耐磨合金,熔炼具有不同锰含量的两种VCp增强复合耐磨合金,并采用Q&P热处理工艺,研究不同锰含量、不同碳配分时间对复合耐磨合金中主要合金元素面分布的影响,为该高韧性VCp增强耐磨合金的研发奠定基础。研究结果表明,V和Ti元素是强碳化物形成元素,基本都以碳化物的形式析出,基体中基本没有或很少固溶有V和Ti元素。而Cr、Mo则在碳化物和基体中均存在,一部分以碳化物形式存在,与VC、TiC构成共晶体;一部分固溶在基体中,能提高合金淬透性。而锰元素则主要固溶在基体中,且分布较为均匀;随着锰元素含量增加会出现局部锰元素富集;但是,当碳配分时间增加时,锰元素能在基体中逐渐地均匀分布。本研究为I&Q&P工艺能应用于VCp增强的复合耐磨合金提供了理论依据。Abstract: Two kinds of VCp reinforced composite wear-resistant alloys with different Mn contents were developed and the Q&P heat treatment process was adopted in order to develop a kind of composite wear-resistant alloy with higher toughness.The effects of different Mn contents and different carbon partition time on surface distribution of the main alloy elements were largely studied.It lays a foundation for the research and development of the high toughness wear resistant alloy.The results show that most of the V and Ti elements precipitate in form of carbides with very little or none of themselves soluble in the matrix due to the strong carbides forming features of V and Ti.Cr and Mo exist in both carbides and matrix,which form eutectics with VC and Ti C or dissolve in the matrix to improve the hardenability of the alloy.Mn is mainly soluble and more evenly distributed in the matrix.The localized Mn enrichment occurs with the increase of Mn content.However,Mn element is gradually of uniform distribution with increase in the carbon partition time.This study provides a theoretical basis for the application of I&Q&P process to VCp reinforced composite wear-resistant alloys.
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