Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第27卷    第5期    总第218期    2017年5月

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文章编号:1004-0609(2017)-05-0988-09
15-5PH不锈钢的时效硬化行为及耐蚀性能
彭新元1, 2,周贤良1, 2,华小珍1, 2

(1. 南昌航空大学 材料科学与工程学院,南昌 330063;
2. 南昌航空大学 江西省金属材料微结构调控重点实验室,南昌 330063
)

摘 要: 利用透射电镜(TEM)、X射线衍射(XRD)、洛氏硬度、动电位极化曲线和交流阻抗等方法对15-5PH不锈钢时效后的组织转变、时效硬化行为及其在Cl-溶液中的耐蚀性能进行研究。结果表明:时效温度较低(低于450 ℃) 时,析出的富Cu相与基体保持共格关系,其硬度和耐腐蚀性能都较高。当时效温度达到550 ℃时,富Cu相长大,出现了逆变奥氏体,且随时效时间的延长而增多,导致硬度下降,但耐蚀性能有所提高;当时效温度升高至620 ℃时,富Cu相呈短棒状,且失去与基体的共格关系,逆变奥氏体继续增多,强化效应完全消失,但耐蚀性能得到改善。

 

关键词: 15-5PH不锈钢;富Cu相;逆变奥氏体;硬化行为;耐蚀性

Aging hardening behavior and corrosion resistance of 15-5PH stainless steel
PENG Xin-yuan1, 2, ZHOU Xian-liang1, 2, HUA Xiao-zhen1, 2

1. School of Material Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China;
2. Key Laboratory for Microstructural Control of Metallic Materials of Jiangxi Province, Nanchang Hangkong University, Nanchang 330063, China

Abstract:The microstructure transformation, aging hardening behavior and corrosion resistance of 15-5PH stainless steel were studied by XRD, TEM, HRC, polarization curve and electrochemical impedance spectroscopy. The results show that the hardness and corrosion resistance due to Cu-rich phase have coherent orientation relationship with matrix when the aging temperature is lower than 450℃. The Cu-rich phases coarsening and the reversed austenite are observed in the specimen, when the aging temperature reaches to 550 ℃. Moreover, the amount of reversed austenite increases with the increase of aging time. So, the hardness decreases but the corrosion resistance increases. When the aging temperature reaches 620 ℃, the Cu-rich phases exhibit elliptical shape and destroy the coherent relation with the martensite matrix, meanwhile, the reversed austenite continues to increase. As a result, the precipitation hardening effect disappears, however, the corrosion resistance is improved.

 

Key words: 15-5 PH stainless steel; Cu-rich phase; reversed austenite; hardening behavior; corrosion resistance

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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