GH4141合金高温拉伸性能及其损伤行为研究

张昭; 裴丙红; 冯旭; 信瑞山; 郭啸东; 肖东平; 周扬

doi:10.7513/j.issn.1004-7638.2024.01.022

GH4141合金高温拉伸性能及其损伤行为研究

doi: 10.7513/j.issn.1004-7638.2024.01.022

张昭^{1, 2,},
裴丙红³,
冯旭³,
信瑞山^{1, 2},
郭啸东¹,
肖东平⁴,
周扬⁴

1.
鞍钢集团北京研究院有限公司, 北京 102200
2.
海洋装备用金属材料及其应用国家重点实验室, 辽宁鞍山 114009
3.
攀钢集团江油长城特殊钢有限公司, 四川江油 621704
4.
成都先进金属材料产业技术研究院股份有限公司, 四川成都 610303

详细信息

作者简介:
张昭，1987年出生，男，北京人，博士研究生，工程师，主要从事合金断裂失效机理方向的研究，E-mail：zhangzhao2084@163.com

中图分类号: TG146.1
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出版历程
- 收稿日期: 2023-02-02
- 刊出日期: 2024-02-29

Study on the high-temperteraure tensile property and damage behavior in GH4141 superalloy

1.
Ansteel Beijing Research Institute Co., Ltd., Beijing 102200, China
2.
State Key Laboratory of Metal Materials for Marine Equipment and Application, Anshan 114009, Liaoning, China
3.
Pangang Group Jiangyou Changcheng Special Steel Co., Ltd., Jiangyou 621704, Sichuan, China
4.
Chengdu Advanced Metal Materials Industrial Technology Institute Co., Ltd., Chengdu 610303, Sichuan, China

摘要

摘要: 研究了室温、300 ℃和500 ℃环境下GH4141合金的拉伸性能，结果表明，合金高温下的抗拉强度明显低于室温，300 ℃和500 ℃拉伸结果表现出锯齿状的应力-应变曲线，并且两种高温环境下的抗拉强度相当。不同温度下断口附近的微观组织表征结果显示裂纹主要在晶界位置产生，无论晶界是否含有粗大MC型碳化物。M₆C和M₂₃C₆构成的链状碳化物使得晶界具有良好塑性，在断口表面形成大量的韧窝形貌。晶粒内部裂纹的产生与滑移带的形成密切相关，延缓滑移带的产生则归因于间隙元素、替代元素以及γ′强化析出相对位错的钉扎效应。注意到500 ℃环境下拉伸过程发生了再结晶现象，在粗大晶粒附近形成细小晶粒，并且伴随着少量碳化物，同时沿晶断裂现象明显减弱。然而，室温和300 ℃环境下的断口特征表现为穿晶和沿晶混合断裂模式，并未发生再结晶现象。
- GH4141合金 /
- 高温拉伸性能 /
- 动态应变时效 /
- 损伤 /
- 碳化物
Abstract: This study focuses on the tensile properties of GH4141 superalloy tested at room temperature, 300 ℃ and 500 ℃, respectively. The tensile strength obtained at high temperatures of 300 ℃ and 500 ℃ with serrated stress-strain curves are lower than that obtained at room temperature. In addition, the tensile strength tested at 500 ℃ is comparable to the value achieved at 300 ℃. The microstructure near the fracture surface of the superalloy is characterized. It is showed that cracks are formed at the grain boundary, irrespective of the observation of MC type carbides. The carbide composed of M₆C and M₂₃C₆ with chain morphology endows grain boundary with a good plasticity which is reflected by numerous dimples in the fractographs. The initiation of cracks within the grains is associated with formation of slip bands. The activation of slip band can be delayed by dislocation pinning effect related to the interstitial elements, substituted elements and the γ′ strengthening precipitate phase. It should be noted that recrystallization occurred during tensile testing at 500 ℃ with a few carbides observed in the vicinity of fracture surface, while the intergranular fracture phenomenon was attenuated. However, the fractography of specimens tested at 300 ℃ exhibit both intergranular and transgranular fracture without recrystallization.
- GH4141 superalloy /
- high temperature tensile property /
- dynamic strain aging /
- damage /
- carbides

HTML全文

图 1 （a）不同温度下的工程应力-应变拉伸曲线；（b）试验前微观组织；（c）试验前碳化物形态及分布

Figure 1. (a) engineering stress-strain curves; (b) microstructure before testing; (c) carbides morphology and distribution before testing

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图 2 光学显微镜下的拉伸断口附近的微观组织及其放大

（a1）、（a2）室温；（b1）、(b2)300 ℃；（c1）、(c2)500 ℃

Figure 2. Optical microscope images of microstructure near fracture region and the corresponding magnified regions

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图 3 扫描电镜表征不同温度下拉伸断口附近的微小裂纹

（a）、（b）室温；（c）300 ℃；（d）500 ℃

Figure 3. SEM images of small cracks near fracture region after tensile tests at different temperatures

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图 4 室温环境下拉伸断口形貌及其局部放大

Figure 4. Fractography after tensile tests at ambient temperature

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图 5 300 ℃环境下拉伸断口形貌及其局部放大

Figure 5. Fractography after tensile tests at 300 ℃

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图 6 500 ℃环境下拉伸断口形貌及其局部放大

Figure 6. Fractography after tensile tests at 500 ℃

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表 1 GH4141合金化学成分

Table 1. Chemical composition of GH4141 superalloy %

C Cr Al Ti Co Mo B Mn Si S Fe Ni

0.06～0.12 18～20 1.4～1.8 3～3.5 10～12 9～10.5 0.003～0.01 <0.1 <0.5 <0.015 <5.0 Bal.

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