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预拉伸对 FGH96 合金残余应力及力学性能的影响
Effect of Pretension on Residual Stress and Mechanical Properties of FGH96 Alloy
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- DOI:
- 作者:
- 周晓明，曾维虎，王志彪，冯业飞，王超渊，邹金文
ZHOU Xiaoming, ZENG Weihu, WANG Zhibiao, FENG Yefei, WANG Chaoyuan, ZOU Jinwen
- 作者单位:
- 中国航发北京航空材料研究院 先进高温结构材料重点实验室，北京 100095
Key Laboratory of Advanced High Temperature Structural Materials, Beijing Institute of Aeronautical Materials, Beijing 100095, China
- 关键词:
- FGH96 合金；预拉伸；残余应力；位错
FGH96 alloy; pretention; residual stress; dislocation
- 摘要:
- 对 FGH96 合金拉伸试片在室温条件下进行 0～4% 预拉伸应变处理后，测试了不同预拉伸应变下 FGH96
合金面内应变、表面残余应力、室温拉伸强度、屈服强度和高温蠕变性能，并对不同预拉伸应变后 FGH96 合金显微组
织、γ′相和位错进行了研究。 结果表明：随着预拉伸应变的增大，试片表面各位置处的残余应力均呈现逐渐降低趋势，且
预拉伸量越大，残余应力降幅越大；在相同预拉伸应变条件下，试片的残余应力降幅较大，这与预拉伸过程中试片面内
应变场显示试片边缘处应变较大的结果相一致。 不同预拉伸应变 FGH96 合金显微组织和 γ′相无明显差别，低预应变条
件下，未能观察到位错切割二次 γ′相；当预应变达到 2.5%时出现少量位错切割二次 γ′相，且出现层错现象。 随着预拉伸
应变增大，位错在晶界处塞积程增大趋势，形成位错缠结。
The FGH96 alloy tensile specimen at room temperature for 0~4% pre-stretching strain after processing, testing the FGH96 alloy under different pre-stretching strain in-plane strain, surface residual stress and room temperature tensile strength, yield strength and high temperature creep properties, and the different pre-stretching strain after FGH96 alloy microstructure, γ′ phase and dislocation were studied. The results show that, with the increase of pretension strain, the residual stress at each position on the specimen surface decreases gradually, and the decrease of residual stress is greater with the increase of pretension strain. Under the same pretension strain condition, the residual stress of the specimen decreases greatly, which is consistent with the result that the strain field in the specimen shows that the strain at the edge of the specimen is larger. The microstructure and γ′ phase of FGH96 alloy with different pretension strains have no obvious difference. Under the condition of low pre-strain, the second γ′ phase of FGH96 alloy can’t be observed in place. When the pre-strain reaches 2.5%, a small amount of dislocations appear to cut the secondary γ′ phase, and the phenomenon of stacking fault appears. With the increase of pre-tensile strain, the packing path of dislocation at grain boundary increases, and the dislocation entanglement are formed.