GH4033合金短时超温后的显微组织损伤及力学性能

doi:10.11900/0412.1961.2015.00265

金属学报

2015, Vol. 51

Issue (10): 1242-1252 DOI: 10.11900/0412.1961.2015.00265

本期目录 | 过刊浏览

GH4033合金短时超温后的显微组织损伤及力学性能

童锦艳^1,²,冯微^1,³,付超²,郑运荣²,冯强^1,²(

)

2 北京科技大学新金属材料国家重点实验室, 北京 100083
3 北京航空材料研究院熔铸中心, 北京 100095

MICROSTRUCTURAL DEGRADATION AND MECHANI- CAL PROPERTIES OF GH4033 ALLOY AFTER OVERHEATING FOR SHORT TIME

Jinyan TONG^1,²,Wei FENG^1,³,Chao FU²,Yunrong ZHENG²,Qiang FENG^1,²(

)

1 National Centre for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083
2 State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083
3 Casting Center, Beijing Institute of Aeronautical Materials, Beijing 100095

引用本文:

童锦艳,冯微,付超,郑运荣,冯强. GH4033合金短时超温后的显微组织损伤及力学性能[J]. 金属学报, 2015, 51(10): 1242-1252.
Jinyan TONG, Wei FENG, Chao FU, Yunrong ZHENG, Qiang FENG. MICROSTRUCTURAL DEGRADATION AND MECHANI- CAL PROPERTIES OF GH4033 ALLOY AFTER OVERHEATING FOR SHORT TIME[J]. Acta Metall Sin, 2015, 51(10): 1242-1252.

全文: PDF(11597 KB) HTML

摘要:

对已服役的航空发动机用GH4033合金二级涡轮叶片榫头部位进行900~1100 ℃短时超温3 min热处理, 之后再进行组织表征和力学性能测试, 研究了短时超温过程中合金的组织损伤及其对室温硬度和700 ℃, 430 MPa下持久寿命的影响规律. 结果表明, GH4033合金中γ’相颗粒在短时超温过程中发生粗化和回溶现象, 当温度达到980 ℃及以上时, 保温3 min后γ’相完全回溶; 随着超温温度的升高, 晶界碳化物逐渐溶解, 1100 ℃时完全溶解, 并造成晶粒开始长大. 短时超温后叶片合金的室温硬度随着γ’相的回溶急剧下降, 当γ’相完全回溶时室温硬度降低至170 HV左右. 合金在700 ℃, 430 MPa下持久寿命随着短时超温温度的升高呈现先增大后急剧降低的规律, 其主要受γ’相的回溶与再析出以及晶界碳化物回溶的影响.

关键词 ： GH4033变形合金, 涡轮叶片, 超温, 显微组织, 持久性能

Abstract：

Service safety of turbine blades in aircraft engines are threatened by microstructural and property degradation instantly caused by overheating during service. Systematic investigations about microstructural degradation during overheating exposures and its influence on mechanical properties of turbine blades during service are limitedly reported. In this work, microstructure and mechanical properties of GH4033 alloy, which was sectioned from the shank of a serviced 2^nd stage turbine blade in an aircraft engine, were studied after overheating at 900~1100 ℃ for 3 min. Microstructural degradation during overheating exposures as well as its influence on room temperature hardness and stress rupture life at 700 ℃, 430 MPa were analyzed. The results of microstructural characterization indicated that the coarsening and dissolution of γ’ precipitates were introduced by overheating exposures, and all of the γ’ precipitates dissolved at 980 ℃ for 3 min. Gradual dissolution of grain boundary (GB) carbides was observed with the increase of overheating temperature. Complete dissolution of GB carbides at 1100 ℃ resulted in grain growth. The room temperature hardness after overheating exposures decreased grossly with the dissolution of γ’ phase. Due to the dissolution and re-precipitation of γ’ phase as well as the dissolution of GB carbides, the stress rupture life under 700 ℃, 430 MPa of GH4033 alloy was initially increased and then decreased significantly.

Key words： GH4033 wrought alloy turbine blade overheating microstructure rupture property

基金资助:* 国家高技术研究发展计划项目2012AA03A513和教育部技术支撑重点项目625010337资助

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https://www.ams.org.cn/CN/10.11900/0412.1961.2015.00265 或 https://www.ams.org.cn/CN/Y2015/V51/I10/1242

图1 GH4033合金二级涡轮叶片轮廓示意图及服役温度分布

图2 GH4033合金板状持久非标样试样示意图

图3 GH4033合金的原始微观组织

图4 GH4033 合金的DSC曲线

图5 原始状态GH4033合金和在1100 ℃超温处理3 min后的OM像

图6 原始状态和经不同温度超温处理3 min并水淬后GH4033 合金晶界碳化物的分布状态

图7 GH4033 合金经不同温度超温处理3 min 并水淬后基体中γ’相的形貌

图8 原始状态和经不同温度超温处理3 min 后GH4033合金的Vickers硬度

图9 GH4033 合金经不同温度超温处理3 min 后在700 ℃, 430 MPa下的持久寿命

表1 不同温度超温处理3 min 后GH4033 合金中γ’相颗粒的平均尺寸和体积分数

图10 不同温度超温处理3 min后GH4033 合金经700 ℃, 2 h 热处理并水淬后的晶界碳化物和γ’相形貌

图11 不同温度超温处理3 min后GH4033 合金断后的晶界碳化物和γ’相形貌

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