新型钴基高温合金中<strong>W</strong>元素对蠕变组织和性能的影响

doi:10.11900/0412.1961.2023.00118

金属学报

2023, Vol. 59

Issue (9): 1209-1220 DOI: 10.11900/0412.1961.2023.00118

研究论文

本期目录 | 过刊浏览

新型钴基高温合金中W元素对蠕变组织和性能的影响

陈佳, 郭敏, 杨敏, 刘林, 张军(

)

西北工业大学凝固技术国家重点实验室西安 710072

Effects of W Concentration on Creep Microstructure and Property of Novel Co-Based Superalloys

CHEN Jia, GUO Min, YANG Min, LIU Lin, ZHANG Jun(

)

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China

引用本文:

陈佳, 郭敏, 杨敏, 刘林, 张军. 新型钴基高温合金中W元素对蠕变组织和性能的影响[J]. 金属学报, 2023, 59(9): 1209-1220.
Jia CHEN, Min GUO, Min YANG, Lin LIU, Jun ZHANG. Effects of W Concentration on Creep Microstructure and Property of Novel Co-Based Superalloys[J]. Acta Metall Sin, 2023, 59(9): 1209-1220.

全文: PDF(4005 KB) HTML

摘要:

以γʹ相强化的Co-Al-W高温合金(Co-9Al-xW，x = 8、9、10，原子分数，%)为研究对象，耦合CALPHAD和晶体塑性本构关系，建立了高温加载时微观组织演化的三元弹塑性相场模型，考察了W含量对蠕变过程中γʹ相演化行为和蠕变性能的影响。结果表明，随W含量增加，γ'相体积分数增加，γ基体塑性变形降低，筏化形成并提前，导致蠕变性能提高。不变矩分析表明，9W和10W合金中筏组织形成是出现稳态蠕变阶段的主要原因。应力/应变分析表明，高W合金γ基体中较大的错配应力减小了塑性变形。

关键词 ：钴基高温合金, 相场模拟, 蠕变, 筏化

Abstract：

γ' precipitate strengthened cobalt-based alloys exhibit superior comprehensive properties and are potential candidates for the anticipated next-generation superalloy. The phase field method, which considers the combined effect of multiple energy fields, effectively elucidates the processing and mechanism of microstructure evolution. By using the ternary elastoplastic phase field model coupled with CALPHAD and crystal plasticity model, the γ' evolution of Co-9Al-xW (x = 8, 9, and 10; atomic fraction, %) alloys during creep processes is simulated herein. The corresponding rafting behaviors and creep properties are evaluated from the perspective of the changes in second-order moment invariant map (SOMIM) and stress/strain fields. The results show that as the W content increases, the volume fraction of the γ' phase increases, the plastic strain in the γ matrix reduces, and rafting occurs with accelerated rate, which enhances the creep property. Further, the SOMIM analysis shows that the raft structure leads to a steady creep behavior in 9W and 10W alloys. In addition, the alloy with a high W content has a high misfit stress in the γ matrix, which leads to a low plastic strain.

Key words： Co-based superalloy phase field simulation creep rafting

收稿日期: 2023-03-23

ZTFLH:

TG146.1

基金资助:国家自然科学基金项目(51971174);国家自然科学基金项目(52031012);国家科技重大专项项目(J2019-VI-0020-0135);国家重点研发计划项目(2017YFB0702902);西北工业大学凝固技术国家重点实验室项目(2022-TZ-01)

作者简介: 陈佳，女，1992年生，博士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2023.00118 或 https://www.ams.org.cn/CN/Y2023/V59/I9/1209

Alloy	Elastic constant of γ / GPa			Elastic constant of γ' / GPa
	$C 11 m$	$C 12 m$	$C 44 m$	$C 11 p$	$C 12 p$	$C 44 p$
Co-9Al-8W (8W)	315	209	160	361	190	212
Co-9Al-9W (9W)	316			363
Co-9Al-10W (10W)	317			364

表1 γ、γ'两相弹性常数

Alloy	$r 0 m$	$r 0 p$
8W	18	210
9W	26	235
10W	30	260

表2 γ和γ'中滑移系开动阈值r0m和r0p (MPa)

图1 八面体滑移系

图2 蠕变应变和蠕变速率曲线

图3 不同W含量合金在900℃、275 MPa压缩蠕变过程中γ/γʹ两相组织演化

图4 不同应变下的二阶不变矩密度谱(SOMIM)

图5 SOMIM中0 < ω¯1 ≤ 0.5范围内γ'数量分数

图6 蠕变过程中筏组织特征演化

图7 蠕变过程中塑性变形演化

图8 蠕变过程中分切应力演化

图9 蠕变过程中位错交互作用阻力演化

图10 γ基体和γ'相中位错运动的平均驱动力

图11 γ和γ'两相中内应力和σ33的平均值演化

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