新型镍基粉末高温合金FGH98的高温疲劳裂纹扩展行为研究

doi:10.3724/SP.J.1037.2012.00445

金属学报

2013, Vol. 49

Issue (1): 71-80 DOI: 10.3724/SP.J.1037.2012.00445

论文

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新型镍基粉末高温合金FGH98的高温疲劳裂纹扩展行为研究

杨健¹，董建新¹，张麦仓¹,贾建²，陶宇²

1.北京科技大学材料科学与工程学院, 北京 100083
2.钢铁研究总院高温材料研究所, 北京 100081

HIGH TEMPERATURE FATIGUE CRACK GROWTH BEHAVIOR OF A NOVEL POWDER METALLURGY SUPERALLOY FGH98

YANG Jian¹, DONG Jianxin¹, ZHANG Maicang¹,JIA Jian², TAO Yu²

1.School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083

2.High Temperature Materials Research Institute, Central Iron and Steel Research Institute, Beijing 100081

引用本文:

杨健，董建新，张麦仓,贾建，陶宇. 新型镍基粉末高温合金FGH98的高温疲劳裂纹扩展行为研究[J]. 金属学报, 2013, 49(1): 71-80.
. HIGH TEMPERATURE FATIGUE CRACK GROWTH BEHAVIOR OF A NOVEL POWDER METALLURGY SUPERALLOY FGH98[J]. Acta Metall Sin, 2013, 49(1): 71-80.

全文: PDF(1208 KB)

摘要:

测定了新型粉末高温合金FGH98在650 ℃空气环境中的疲劳裂纹扩展速率, 与前两代粉末高温合金FGH95和FGH96的裂纹扩展速率进行了比较分析, 研究了合金显微结构以及保载时间对FGH98合金裂纹扩展速率的影响. 结果表明, FGH98合金的高温疲劳裂纹扩展抗力较前两代粉末高温合金有了明显提高. 控制固溶后以适当的方式冷却, 使得二次和三次γ’相均匀匹配析出, 可以获得具有良好疲劳裂纹扩展抗力的合金组织. 粗晶组织有利于降低FGH98合金的疲劳裂纹扩展速率, 尤其是在近门槛区. FGH98合金的高温疲劳裂纹扩展速率随保载时间的增加而增加, 其断裂模式相应地从穿晶-沿晶混合断裂变为沿晶断裂.

关键词 ： FGH98, 疲劳裂纹扩展, γ’相, 晶粒尺寸

Abstract：

Powder metallurgy superalloys are important materials for manufacturing aero engine turbine disks which are subjected to loading in the forms of fatigue and creep-fatigue in service. In order to meet the increasing demands for advanced aero engines with high thrust-weight ratios, a novel generation of Ni-based powder metallurgy superalloy FGH98 was developed, which was expected to have high strength and good damage tolerance property. For the sake of examining the fatigue crack growth resistance of FGH98, the fatigue crack growth rate of this novel superalloy was investigated at 650 ℃ in air and then compared with those of the first two generations of powder metallurgy superalloys FGH95 and FGH96. The effects of microstructures and hold--time on the fatigue crack growth behavior of FGH98 were studied. It was found that the fatigue crack growth resistance of FGH98 was significantly improved in comparison with those of FGH95 and FGH96. Conducting proper cooling methods after solution could make the secondary and tertiaryγ’ phase precipitate in a uniform order, causing that the alloy could have good fatigue crack propagation resistance. It was also found that FGH98 with coarser grains showed a lower fatigue crack growth rate, especially in the near--threshold regime, and its fatigue crack growth rate increased with increasing hold-time, and correspondingly, its fracture mode changed from a mixture of transgranular-intergranular into pure intergranular.

Key words： FGH98')" href="#">

FGH98 fatigue crack growth γ’phase grain size

收稿日期: 2012-07-24

基金资助:

国家重点基础研究发展计划资助项目2010CB631200

作者简介: 杨健, 男, 1987年生, 硕士生

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https://www.ams.org.cn/CN/10.3724/SP.J.1037.2012.00445 或 https://www.ams.org.cn/CN/Y2013/V49/I1/71

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