热加工工艺
熱加工工藝
열가공공예
HOT WORKING TECHNOLOGY
2009年
20期
72-75
,共4页
粉末冶金%原位合成%复合材料%微观组织
粉末冶金%原位閤成%複閤材料%微觀組織
분말야금%원위합성%복합재료%미관조직
powder metallurgy%in-situ synthesis%composite%microstructure
采用粉末冶金和原位合成相结合的方法合成V(C,N)颗粒增强铁基复合材料,用扫描电镜、X射线衍射等测试方法对试样进行了组织结构分析,并探讨了原位合成V(C,N)的机理.结果表明,石墨与氮气的存在降低了σ-FeV相的稳定性,使其分解为崮溶大量V的Fe,C、N与V发生反应生成V(C,N);原位合成的复合材料主要相组成为V(C,N)和γ-Fe,所合成的硬质相V(C,N)颗粒细小,在铁基体中均匀分布.在重载十滑动摩擦条件下,V(C,N)颗粒增强铁基复合材料显示出良好的耐磨性.
採用粉末冶金和原位閤成相結閤的方法閤成V(C,N)顆粒增彊鐵基複閤材料,用掃描電鏡、X射線衍射等測試方法對試樣進行瞭組織結構分析,併探討瞭原位閤成V(C,N)的機理.結果錶明,石墨與氮氣的存在降低瞭σ-FeV相的穩定性,使其分解為崮溶大量V的Fe,C、N與V髮生反應生成V(C,N);原位閤成的複閤材料主要相組成為V(C,N)和γ-Fe,所閤成的硬質相V(C,N)顆粒細小,在鐵基體中均勻分佈.在重載十滑動摩抆條件下,V(C,N)顆粒增彊鐵基複閤材料顯示齣良好的耐磨性.
채용분말야금화원위합성상결합적방법합성V(C,N)과립증강철기복합재료,용소묘전경、X사선연사등측시방법대시양진행료조직결구분석,병탐토료원위합성V(C,N)적궤리.결과표명,석묵여담기적존재강저료σ-FeV상적은정성,사기분해위고용대량V적Fe,C、N여V발생반응생성V(C,N);원위합성적복합재료주요상조성위V(C,N)화γ-Fe,소합성적경질상V(C,N)과립세소,재철기체중균균분포.재중재십활동마찰조건하,V(C,N)과립증강철기복합재료현시출량호적내마성.
A process which combines in-situ synthesis with powder metallurgy technique was used to produce V (C, N) particulates reinforced iron matrix composite. The microstructure of the composite was investigated using XRD and SEM. The reaction princple of V (C, N) formed by in-situ synthesis was also discussed. The results show that graphite and nitrogen reduce the stability of σ-FeV, and σ-FeV decomposes into Fe in which V atoms dissolve. The synthesized composite consists of V(C, N) and γ-Fe, and spherical V(C, N) particles exhibit finer size and homogeneous distribution in the matrix. Under the condition of dry sliding with heavy loads, the V(C, N)/Fe composite holds great wear-resistance.
