<strong>K417G</strong>合金的环境致脆磨损机理

doi:10.11901/1005.3093.2020.275

材料研究学报

2021, Vol. 35

Issue (7): 501-509 DOI: 10.11901/1005.3093.2020.275

研究论文

本期目录 | 过刊浏览

K417G合金的环境致脆磨损机理

王振生¹(

), 谢威¹, 彭真¹^,², 贺颖茜³, 曾阳根⁴

^1.湖南科技大学机械设备健康维护湖南省重点实验室湘潭 411201
^2.中国航发南方工业有限公司株洲 412002
^3.湖南南方通用航空发动机有限公司株洲 412002
^4.国网湖南省电力有限公司娄底供电分公司娄底 417000

Environment-induced Brittle Wear Mechanism of K417G Alloy

WANG Zhensheng¹(

), XIE Wei¹, PENG Zhen¹^,², HE Yingqian³, ZENG Yanggen⁴

^1.Hunan Provincial Key Laboratory of Mechanical Equipment Health Maintenance, Hunan University of Science and Technology, Xiangtan 411201, China
^2.China Aviation Development South Industry Co. Ltd. , Zhuzhou 412002, China
^3.Hunan South General Aviation Engine Co. Ltd. , Zhuzhou 412002, China
^4.State Grid Hunan Electric Power Co. Ltd. , Loudi Power Supply Branch, Loudi 417000, China

引用本文:

王振生, 谢威, 彭真, 贺颖茜, 曾阳根. K417G合金的环境致脆磨损机理[J]. 材料研究学报, 2021, 35(7): 501-509.
Zhensheng WANG, Wei XIE, Zhen PENG, Yingqian HE, Yanggen ZENG. Environment-induced Brittle Wear Mechanism of K417G Alloy[J]. Chinese Journal of Materials Research, 2021, 35(7): 501-509.

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摘要:

采用可控气氛磨损试验机测试含有Ni₃Al相的K417 G合金在不同相对湿度空气、真空、氧气、氮气、二氧化碳、氢气和氩气下的摩擦磨损性能，用SEM观察磨损表面形貌，基于线弹性力学计算表面裂纹应力强度因子K_I，依据能量学计算合金元素的环境敏感性，研究合金的环境致脆磨损机理。结果表明：磨损工况下，高相对湿度空气中的水蒸汽是导致K417G合金发生氢致脆性磨损的腐蚀介质，水蒸汽与合金中的γ′-Ni₃Al反应生成的原子态H导致环境脆性，环境脆性裂纹源在γ/γ′界面以及碳化物与合金基体界面形核，裂纹既沿着γ/γ′界面以及碳化物与合金基体界面扩展，又进入γ′晶粒；合金表面裂纹的应力强度因子K_I小于合金的断裂韧性K_IC，接触应力不导致磨损表面裂纹；能量学计算表明，空气下，磨损表面裂纹的产生与Al的含量有关，Al的临界含量为5.53%(原子分数)。

关键词 ：金属材料, K417G合金, 镍基合金, Ni₃Al, 摩擦磨损, 环境致脆

Abstract：

The friction and wear properties of K417G alloy in air, vacuum, oxygen, nitrogen, carbon dioxide, hydrogen, and argon environments with different relative humidity were assessed by means of a controlled atmosphere wear tester and SEM. Meanwhile, the stress intensity factor K_I of the alloy wear surface crack is calculated based on linear elastic mechanics. The environmental sensitivity of alloying elements is also calculated based on energetics. The results show that under wear conditions, water vapor in the air with high relative humidity is the corrosive medium that causes hydrogen-induced brittle wear of K417G alloy. The water vapor reacts with γ′-Ni₃Al in the alloy to form atomic H, which causes environmental embrittlement of the alloy. The environmental brittle crack may nucleate at the interfaces of γ/γ′and carbide/alloy matrix. The cracks not only extend along the interfaces of γ/γ′ and carbide/alloy matrix, but also enter the γ′ grains. The stress intensity factor K_I of the crack on the alloy surface is smaller than the fracture toughness K_IC of the alloy. Therefore, the contact stress on the worn surface of the alloy does not cause cracks wherein. Energetics calculations show that, in air, the occurrence of surface cracks on the wearing alloy is related to the Al content in the alloy, while the critical content of Al is 5.53% (atomic fraction).

Key words： metallic materials K417G alloy nickel based alloy Ni₃Al friction and wear environmental brittleness

收稿日期: 2020-07-06

ZTFLH:

TH117

基金资助:湖南省自然科学基金(2020JJ4312)

作者简介: 王振生，男，1978年生，博士

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https://www.cjmr.org/CN/10.11901/1005.3093.2020.275 或 https://www.cjmr.org/CN/Y2021/V35/I7/501

表1 K417G合金的化学成分

图1 K417G合金腐蚀后的组织形貌SEM图片

图2 K417G合金不同气氛下的摩擦系数和磨损率

图3 不同环境气氛下K417G合金磨损表面的SEM形貌

图4 K417G合金磨损截面SEM形貌

表2 K417G合金裂纹扩展区域的EDS分析结果

图5 K417G合金磨损表面腐蚀后的形貌

表3 K417G合金的接触面积、平均应力和力学性能[5]

表4 K417G合金主要组元的代表性氧化物的生成吉布斯自由能

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