摘要
以氧含量分别为60×10^(-6),145×10^(-6)和216×10^(-6)的GH4169预合金粉末为原料,采用粉末热等静压法制备成块体合金,然后进行热处理,研究粉末氧含量对FGH4169合金的室温和高温力学性能及组织的影响。结果表明,随原始粉末氧含量从60×10^(-6)增加到216×10^(-6),Al和Ti元素在粉末表面富集,并生成斑点状氧化物;粉末氧含量对FGH4169合金的致密度无明显影响,但可改变合金中碳化物的分布和形态。高氧含量的FGH4169合金中易形成原始颗粒边界(prior particle boundary,PPB),PPB中含有碳化物和氧化物。FGH4169合金在室温和高温下的塑性均随氧含量增加而降低,粉末氧含量为60×10^(-6)和145×10^(-6)时,FGH4169合金在室温和650℃下的强度和塑性都能达到变形GH4169合金的标准值。
Three kinds of GH4169 prealloyed powders with varied oxygen contents （60 ×10^-6, 145 ×10^-6 and 216 ×10^-6） were consolidated to alloys by hot isostatic pressing （HIP） powder metallurgy technology, and then heat treatment was performed. The effects of powder oxygen content on mechanical properties and structures of FGH4169 alloys at room and elevated temperatures were investigated. The results show that Al and Ti elements are enriched on the powder surface with oxygen content increasing from 60×10^-6to 216×10^-6and freckled oxides are presented. The densification behaviour of the alloys has no dependence on oxygen content, while the oxygen content can affect the distribution and morphology of carbides in the alloy. High oxygen content contributes to more PPB （prior particle boundary） formation involving carbides and oxides. The ductility of the alloys decreases with increasing oxygen content both at room and elevated temperatures. The strength and ductility of FGH4169 alloys with oxygen content of 60 ×10^-6 and 145 ×10^-6 are higher than the specified values for wrought alloys at both room temperature and 650 ℃.
出处
《粉末冶金材料科学与工程》
EI
北大核心
2017年第1期33-40,共8页
Materials Science and Engineering of Powder Metallurgy
基金
有色金属先进结构材料与制造协同创新基金资助项目
