<strong>750℃</strong>时效对<strong>GH4742</strong>合金疲劳裂纹扩展行为的影响

doi:10.11901/1005.3093.2019.138

材料研究学报

2019, Vol. 33

Issue (10): 721-727 DOI: 10.11901/1005.3093.2019.138

研究论文

本期目录 | 过刊浏览

750℃时效对GH4742合金疲劳裂纹扩展行为的影响

张星硕^1,²,王磊^1,²(

),刘杨^1,²,王斯堃^1,²

1. 东北大学材料各向异性与织构教育部重点实验室沈阳 110819
2. 东北大学材料科学与工程学院沈阳 110819

Effect of Aging Treatment at 750℃ on Fatigue Crack Propagation Behavior of GH4742 Superalloy

ZHANG Xingshuo^1,²,WANG Lei^1,²(

),LIU Yang^1,²,WANG Sikun^1,²

1. Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern University, Shenyang 110819, China
2. School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China

引用本文:

张星硕,王磊,刘杨,王斯堃. 750℃时效对GH4742合金疲劳裂纹扩展行为的影响[J]. 材料研究学报, 2019, 33(10): 721-727.
Xingshuo ZHANG, Lei WANG, Yang LIU, Sikun WANG. Effect of Aging Treatment at 750℃ on Fatigue Crack Propagation Behavior of GH4742 Superalloy[J]. Chinese Journal of Materials Research, 2019, 33(10): 721-727.

全文: PDF(12028 KB) HTML

摘要:

研究了在750℃时效处理的GH4742合金的组织演化对疲劳裂纹扩展行为的影响。结果表明，随着时效时间的延长合金中的块状一次γ′相长大且其边界圆滑化，花瓣状二次γ′相沿界面分裂，三次γ′相回溶在基体中或聚集长大成圆角方形γ′相。随着时效时间的延长合金疲劳裂纹的扩展速率呈增加趋势，主裂纹以绕过一次和二次γ′相的方式扩展。近门槛区的疲劳裂纹扩展速率对组织较为敏感，一次γ′相和二次γ′相边界的圆滑化使疲劳裂纹扩展速率提高，三次γ′相适当粗化可提高合金强度和ΔK较低区域裂纹的扩展抗力；Paris区和快速扩展区的应力强度因子范围ΔK较高，组织对疲劳裂纹扩展速率的影响降低。

关键词 ：金属材料, GH4742合金, 时效, 疲劳, 裂纹扩展行为

Abstract：

The effect of the microstructure of GH4742 superalloy after aging at 750℃ on the fatigue crack propagation behavior were investigated. The results show that during aging the primary block like γ′-phase grows up with a smooth boundary, the secondary petal-shaped γ′-phase breaks along the boundary, and the thrice γ′-phase re-dissolves into the matrix or coarsens into corner square like γ′-phase. The main fatigue crack easily propagates across the region without the primary γ′-phase or the secondary γ′-phase. With the increasing aging time the fatigue crack propagation rate increases. Within the near-threshold region the fatigue crack propagation rate is very sensitive to the microstructure. The smooth boundaries of the primary γ′-phase and the secondary γ′-phase lead to the increase of fatigue crack propagation rate, but the fatigue crack propagation resistance increases with the appropriate coarsening of the thrice γ′-phase within the low ΔK region. Because the range of stress intensity factor ΔK is higher in both the Paris region and the rapid propagation region, the influence of the microstructure on the fatigue crack propagation rate is decreased.

Key words： metallic materials GH4742 superalloy aging fatigue crack propagation behavior

收稿日期: 2019-03-04

ZTFLH:

TG132.3

基金资助:国家自然科学基金(U1708253);两机重大专项（基础研究）(2017-VI-0002)

作者简介: 张星硕，女，1991年生，硕士

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https://www.cjmr.org/CN/10.11901/1005.3093.2019.138 或 https://www.cjmr.org/CN/Y2019/V33/I10/721

图1 GH4742合金拉伸试样的尺寸

图2 GH4742合金疲劳裂纹扩展速率CT试样的尺寸

图3 GH4742合金标准热处理和750℃时效处理后γ′相的SEM形貌

图4 GH4742合金标准热处理后MC型碳化物的SEM形貌

图5 750℃时效GH4742合金疲劳裂纹的扩展速率曲线

表1 750℃时效GH4742合金疲劳裂纹扩展速率Paris公式

图6 750℃时效GH4742合金近门槛区疲劳裂纹扩展路径的SEM形貌

表2 750℃时效GH4742合金室温拉伸性能和硬度值

图7 750℃时效GH4742合金疲劳裂纹扩展路径的SEM形貌

图8 750℃时效GH4742合金整体阶段裂纹扩展断口表面粗糙度

图9 750℃时效GH4742合金近门槛区、Paris区和快速扩展区裂纹扩展断口的形貌

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