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改型 Inconel 718超合金的组织结构与性能关系(英文)

董建新 , 徐志超 , 谢锡善 , 章守华

材料研究学报

研究了强化元素Nb,Ti,Al 及Mo 含量的变化对Incone1718合金显微组织的影响,测定了γ′+γ″包覆组织的析出特征,及其高温显微组织热稳定性与力学性能的关系。实验表明:合理地调整强化元素的含量及比例,可以得到γ′+γ″的包覆组织,从而提高新型复合强化组织的稳定性,并保持兼有足够的室温强度和良好的高温持久强度。

关键词: Inconel 718合金 , compact morphology , structure stability , stress rupture property

INCONEL718型合金中γ″和γ′的复合及单独析出对组织稳定性的影响

董建新 , 谢锡善 , 章守华

金属学报

用透射电镜观察了Inconel718及其改型合金中的时效析出组织调整Nb,Ti,Al的含量及比例,可以得到与通常合金中γ′和γ″单独析出有所不同的γ′和γ″的复合组织及包覆组织两类析出形态、其中γ″在γ′上析出的包覆组织具有较好的高温长期时效组织稳定性过时效试验结果表明.改型合金不同于Inconel718合金γ″致δ的相转变,却以强化相溶解而使材料软化

关键词: Inconel718合金 , thermal structure stability , associated precipitate , compact morphology

INFLUENCE OF ASSOCIATED AND SEPARATE PRECIPITATION OF γ″ AND γ′ ON STRUCTURE STABILITY IN INCONEL718 AND MODIFIED ALLOYS

DONG jianxin XIE Xishan ZHANG Shouhua University of Science and Technology Beijing , Beijing , China doctorate student , Department of Materials Science and Engineering , University of Science and Technology Beijing , Beijing 100083 , China

金属学报(英文版)

The precipitation behavior in Inconel 718 and modified alloys has been studied by means of TEM.The structure of associated precipitation and compact morphology of γ″+γ′ were ob- tained by modifying the contents of Al,Ti and Nb.Experimental results show that the com- pact morphology of γ″+γ′ has the best structure stability at higher temperatures.Instead of the transformation γ″→δ in alloy 718 the dissolution of strengthening phases in modified alloy leads material degradation.

关键词: superalloy , null , null , null , null

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