热等静压及恢复热处理工艺对DZ125蠕变损伤的影响

doi:10.11868/j.issn.1001-4381.2014.001203

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摘要

选用4种不同参数的热等静压及恢复热处理工艺对DZ125蠕变损伤试样进行显微组织演化的研究，并进行力学性能评价。结果表明：DZ125合金经预持久损伤实验后，显微组织出现了γ'相退化、蠕变孔洞形成等，但是碳化物没有出现由MC型向M₂₃C₆及M₆C型分解。此外，热等静压的温度在孔洞愈合过程中作用显著，1200℃及1250℃温度下分别出现了γ'同心筏排结构及合金的初熔现象。同时，通过选取合适的热等静压参数，可以避免内部再结晶的产生。合理的热等静压及恢复热处理工艺可以改善蠕变损伤的显微组织，并使其显微硬度达到原始态水平，且持久寿命得到提高。

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	王天佑
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关键词 ：定向凝固高温合金, 蠕变损伤, 显微组织, 热等静压, 恢复热处理

Abstract：

Four different processes of hot isostatic pressing (HIP) combined with rejuvenation heat treatments (RHT) were adopted to reveal the microstructural evolution of creep damaged DZ125 specimens, finally the mechanical properties were evaluated.The results show that both γ' precipitate degeneration and creep cavities for the creep damaged DZ125 superalloy are found after the pre-endurance damage test.However, the carbided compositions from MC type to M₂₃C₆ type or M₆C type has not been observed for DZ125.In addition, it is found that the HIP temperature play a dominant role in the cavity healing process for the damaged specimens. The concentrically oriented γ' rafting structure and the incipient melting are observed at 1200℃ and 1250℃ respectively.Meanwhile, it is found that the appropriate HIP schedule adopted can effectively avoid the internal recrystallization for the directionally solidified nickel-based superalloy DZ125. The appropriate HIP schedule combined with RHT process can successfully restore the microstructure induced by creep damage and recover the degraded micro-hardness to the original one, in addition improve the creep rupture life.

Key words： directionally solidified superalloy creep damage microstructure hot isostatic pressing rejuvenation heat treatment

收稿日期: 2014-10-22 出版日期: 2017-02-23

中图分类号:

TG132.3⁺2

基金资助:国家科技部“十一五”科技计划资助项目(2011BAK06B03)

通讯作者: 张峥 E-mail: zhangzh@buaa.edu.cn

作者简介: 张峥(1965-),男,教授,博士生导师,研究方向:机械装备失效分析预测预防,材料的疲劳断裂与力学性能,联系地址:北京市海淀区学院路37号北京航空航天大学D526(100191),zhangzh@buaa.edu.cn

引用本文:

王天佑, 王小蒙, 赵子华, 张峥. 热等静压及恢复热处理工艺对DZ125蠕变损伤的影响[J]. 材料工程, 2017, 45(2): 88-95.
Tian-you WANG, Xiao-meng WANG, Zi-hua ZHAO, Zheng ZHANG. Effect of HIP Combined with RHT Process on Creep Damage of DZ125 Superalloy. Journal of Materials Engineering, 2017, 45(2): 88-95.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2014.001203 或 http://jme.biam.ac.cn/CN/Y2017/V45/I2/88

Table 1 DZ125合金化学成分(质量分数/%)

Table 2 DZ125合金热等静压及恢复热处理工艺参数

Fig.1 DZ125合金的显微组织 (a)原始态；(b)预持久损伤态

Fig.2 碳化物的形貌 (a)原始态；(b)预持久损伤态

Table 3 DZ125合金预持久实验前后碳化物能谱结果(质量分数/%)

Fig.3 预持久实验后产生的蠕变孔洞 (a)低倍金相照片;(b)碳化物处；(c)纵向晶界处

Fig.4 HIP1条件下处理后的显微组织形貌
(a)铸造疏松；(b)脊状γ相；(c)同心筏排；(d)治愈界面

Fig.5 HIP2条件下处理后的显微组织形貌
(a)OM；(b)少量未愈合的蠕变空洞

Fig.6 HIP3条件下处理后的显微组织形貌 (a)初溶点；(b)葵花状共晶

Fig.7 HIP4条件下处理后的显微组织形貌 (a)OM；(b)SEM

Fig.8 HIP1+RHT处理后的显微组织形貌 (a)γ′贫化区；(b)修复后的γ′相

Fig.9 HIP2+RHT和HIP4+RHT处理后的显微组织形貌
(a)HIP2+RHT；(b)HIP4+RHT；(c)碳化物周围的形貌；(d)纵向晶界附近的形貌

Table 4 DZ125合金经HIP2+RHT处理后碳化物能谱结果(质量分数/%)

Fig.10 原始态、损伤态及经HIP和HIP+RHT处理后合金的显微硬度

Fig.11 不同条件下总持久寿命

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