化学成分对GH4169合金组织与力学性能的影响

doi:10.13251/j.issn.0254-6051.2020.12.039

金属热处理 ›› 2020, Vol. 45 ›› Issue (12): 197-204.DOI: 10.13251/j.issn.0254-6051.2020.12.039

化学成分对GH4169合金组织与力学性能的影响

马军^1,2,3, 申佳林^1,2,3, 李茂明^1,2,3, 梁宇^1,2,3

1.贵州大学材料与冶金学院, 贵州贵阳 550025;
2.贵州省材料结构与强度重点实验室, 贵州贵阳 550025;
3.高性能金属结构材料与制造技术国家地方联合工程实验室, 贵州贵阳 550025

收稿日期:2020-07-04 出版日期:2020-12-25 发布日期:2021-01-14
通讯作者: 梁宇,博士,博士生导师,E-mail: Xq.liangyu@126.com
作者简介:马军(1993—),男,硕士研究生,主要研究方向为材料结构与性能,E-mail: 841904812@qq.com。
基金资助:
国家自然科学基金(51761003); 贵州省自然科学基金([2017]5788); 黔科合平台人才([2020]6006)

Effect of chemical composition on microstructure and mechanical properties of GH4169 alloy

Ma Jun^1,2,3, Shen Jialin^1,2,3, Li Maoming^1,2,3, Liang Yu^1,2,3

1. School of Materials Science and Engineering, Guizhou University, Guiyang Guizhou 550025, China;
2. Key Laboratory of Material Structure and Strength, Guiyang Guizhou 550025, China;
3. National and Local Joint Engineering Laboratory of High Performance Metal Structural Materials and Manufacturing Technology, Guiyang Guizhou 550025, China

Received:2020-07-04 Online:2020-12-25 Published:2021-01-14

摘要/Abstract

摘要： 针对不同Nb、Al、Ti含量的GH4169合金,对其进行固溶时效热处理,研究微观组织与拉伸性能的变化规律。研究表明,一定的Al/Ti和(Al+Ti)/Nb值下,随Nb含量增加,δ相含量增加,并且具有较好的高温稳定性,高温固溶可有效阻止晶粒的长大,主要通过稳定的δ相来保证合金的细晶强化。当Al/Ti与(Al+Ti)/Nb比值较低时,时效后γ″、γ'含量有所降低,γ″相形貌由唇状变为圆盘或芝麻粒状,其中Nb元素主要形成δ相。力学性能表明,Al/Ti和(Al+Ti)/Nb值一定时,拉伸强度主要受晶粒尺寸影响,而δ相含量影响较小。但当Al/Ti与(Al+Ti)/Nb比值较低时,由于强化相γ″和γ'数量与形貌的变化,拉伸力学性能显著降低,其微观硬度也随拉伸强度的降低而降低。

关键词: GH4169合金, 合金元素, 力学性能, 组织

Abstract: The microstructure and tensile properties of GH4169 alloy with different Nb, Al and Ti contents were studied after solution and aging treatment. The results show that under certain Al/Ti and (Al+Ti)/Nb ratios, the δ phase increases in amount with the increase of Nb content and has better high temperature stability; meanwhile, the high temperature solution treatment can effectively prevent grain growth and ensure the fine grain strengthening by the stable δ phase. When the Al/Ti and (Al+Ti)/Nb ratios are relatively low, the contents of γ″ and γ' phases decrease, and the morphology of γ″ changes from lip-shape to disc-shape or sesame-like shape, in this case the Nb element will mainly form δ phase. The results of mechanical properties show that when the Al/Ti and (Al+Ti)/Nb ratios are similar, the tensile strength is mainly affected by grain size, while the effect of δ phase content is less. However, when the Al/Ti and (Al+Ti)/Nb ratios are relatively low, due to the quantity and morphology changes of the strengthening phases γ″ and γ', the tensile properties are significantly poorer, and the microhardness also decreases along with the decrease of tensile strength.

Key words: GH4169 alloy, alloying element, mechanical properties, microstructure

中图分类号:

TG135⁺.4

马军, 申佳林, 李茂明, 梁宇. 化学成分对GH4169合金组织与力学性能的影响[J]. 金属热处理, 2020, 45(12): 197-204.

Ma Jun, Shen Jialin, Li Maoming, Liang Yu. Effect of chemical composition on microstructure and mechanical properties of GH4169 alloy[J]. Heat Treatment of Metals, 2020, 45(12): 197-204.

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化学成分对GH4169合金组织与力学性能的影响

Effect of chemical composition on microstructure and mechanical properties of GH4169 alloy

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