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OALib Journal期刊
ISSN: 2333-9721
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热模锻造+直接时效粉末高温合金的强化机制
DOI: DOI:10.3724/SP.J.1037.2009.00781, PP. 324-328
Keywords: 镍基高温合金,粉末高温合金,热模锻造+直接时效,强化机理
Abstract:
对涡轮盘用镍基粉末高温合金FGH4096进行了热模锻造+直接时效处理,探索细化粉末高温合金毛坯组织的工艺及相关增强机制.结果表明在不降低延伸率的前提下,直接时效处理对于热模锻造后的合金具有明显的强化作用,并且以多方向变形配合直接时效的强化效果最为显著.按多方向热模锻造+直接时效工艺,可使FGH4096合金的组织显著细化,平均晶粒尺寸达6μm,γ'相析出尺寸达80nm.OM,SEM和TEM观察表明,除多方向大变形可直接破碎晶粒、细化晶粒外,反复再结晶也是细化晶粒的有效途径;同时,洁净的再结晶晶界完全取代了原始粉末颗粒边界.直接时效处理后保留了多方向变形产生的位错缠结,并且获得更为细小的γ'相.热模锻造+直接时效处理后合金所表现出来的超高强度主要源自于细晶强化、晶界强化、形变强化和γ'相强化的综合作用.
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