时效时间对沉淀强化Fe-Ni基奥氏体合金亚稳点蚀性能的影响

doi:10.13251/j.issn.0254-6051.2025.04.023

金属热处理 ›› 2025, Vol. 50 ›› Issue (4): 162-167.DOI: 10.13251/j.issn.0254-6051.2025.04.023

时效时间对沉淀强化Fe-Ni基奥氏体合金亚稳点蚀性能的影响

闫英杰^1,2, 路鹏江^1,2, 张钰昆^1,2, 曹睿^1,2

1.兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室, 甘肃兰州 730050;
2.兰州理工大学材料科学与工程学院, 甘肃兰州 730050

收稿日期:2024-10-21 修回日期:2025-01-10 发布日期:2025-06-13
作者简介:闫英杰(1981—),男,副研究员,博士,主要研究方向为材料强韧化,E-mail: yjyan@lut.edu.cn
基金资助:
国家自然科学基金(51961024,52071170,52175325)

Effect of aging time on metastable pitting resistance of a precipitation-strengthened Fe-Ni based austenitic alloy

Yan Yingjie^1,2, Lu Pengjiang^1,2, Zhang Yukun^1,2, Cao Rui^1,2

1. State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou Gansu 730050, China;
2. School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou Gansu 730050, China

Received:2024-10-21 Revised:2025-01-10 Published:2025-06-13

摘要/Abstract

摘要： 对固溶态Fe-Ni基奥氏体合金在740 ℃进行不同时间的时效处理,通过动电位极化测试、恒电位极化测试对合金的耐亚稳点蚀性能进行表征,随后采用扫描电镜(SEM)、能量色散X射线光谱(EDS)对其点蚀形成原因进行分析。结果表明:固溶态(980 ℃保温1 h后空冷)合金耐亚稳点蚀性能最好;740 ℃时效不同时间(4、8、16、32 h)合金中,时效4 h合金点蚀产生于富Al析出物周围,时效8、16、32 h合金点蚀发生在富Ti析出物,两种析出物均贫Ni;随时效时间增加,析出物尺寸变大,贫Ni区域相应变大,贫Ni区发生亚稳点蚀。

关键词: 沉淀强化奥氏体合金, 时效时间, 亚稳点蚀, 腐蚀形貌

Abstract: A solution treated Fe-Ni based austenitic alloy was aged at 740 ℃ for different time, and the metastable pitting resistance of the alloy was characterized by potentiodynamic polarization test and potentiostatic polarization test. Then the causes of pitting were analyzed by scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDS). The results show that the alloy solution treated at 980 ℃ for 1 h then air cooling has the best metastable pitting resistance. In the alloy specimens aged at 740 ℃ for different time (4, 8, 16, 32 h), the pitting of specimen aged for 4 h occurs around the Al-rich precipitates, while that for 8, 16 and 32 h is on the Ti-rich precipitates. Both precipitates are deficient in Ni. As the aging time increases, the size of the precipitates increases, the Ni-poor region correspondingly increases, and metastable pitting occurs in the Ni-poor region.

Key words: precipitation strengthened austenitic alloy, aging time, metastable pitting, corrosion morphology

中图分类号:

闫英杰, 路鹏江, 张钰昆, 曹睿. 时效时间对沉淀强化Fe-Ni基奥氏体合金亚稳点蚀性能的影响[J]. 金属热处理, 2025, 50(4): 162-167.

Yan Yingjie, Lu Pengjiang, Zhang Yukun, Cao Rui. Effect of aging time on metastable pitting resistance of a precipitation-strengthened Fe-Ni based austenitic alloy[J]. Heat Treatment of Metals, 2025, 50(4): 162-167.

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时效时间对沉淀强化Fe-Ni基奥氏体合金亚稳点蚀性能的影响

Effect of aging time on metastable pitting resistance of a precipitation-strengthened Fe-Ni based austenitic alloy

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