Microstructure, mechanical properties and corrosion behavior of commercial 7N01 alloys  

工业7N01合金的显微组织、力学性能及腐蚀性能

作　　者：Pei-hao ZHAO Xiao-lan WU Yang LIU Kun-yuan GAO Sheng-ping WEN Wu WEI Li RONG Hui HUANG Hong WU De-jing ZHOU Qian ZHANG Zuo-ren NIE 赵沛浩;吴晓蓝;刘阳;高坤元;文胜平;魏午;荣莉;黄晖;吴宏;周德敬;张倩;聂祚仁(北京工业大学材料与制造学部,北京100124;中南大学粉末冶金国家重点实验室,长沙410083;银邦金属复合材料股份有限公司江苏省复合材料重点实验室,无锡214145;中国铁道科学研究院集团有限公司金属及化学研究所,北京100081)

机构地区：[1]Faculty of Materials and Manufacturing,Beijing University of Technology,Beijing 100124,China [2]State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China [3]Jiangsu Key Laboratory for Clad Materials,Yin Bang Clad Material Co.,Ltd.,Wuxi 214145,China [4]Metal&Chemistry Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China

出　　处：《Transactions of Nonferrous Metals Society of China》2022年第3期778-789,共12页中国有色金属学报（英文版）

基　　金：the National Key Research and Development Program of China (Nos. 2021YFB3704204, 2021YFB3700902, 2021YFB3704205);Beijing Natural Science Foundation, China (No. 2202009);the National Natural Science Foundation of China (No. 51621003);Basic Research Program of Jiangsu Province (Natural Science Foundation), China (No. BK20191148);Beijing Lab Project for Modern Transportation Metallic Materials and Processing Technology and Jiangsu Key Laboratory for Clad Materials, China (No. BM2014006)。

摘　　要：The effect of grain morphology and precipitates on mechanical properties and corrosion behavior of two commercial 7 N01 alloys was studied using transmission electron microscopy(TEM) and scanning electron microscopy(SEM) equipped with electron backscatter diffraction(EBSD). Results showed that the recrystallization degree of the outer surface of 7 N01-I alloy was lower than that of 7 N01-II alloy. The main strengthening precipitates of two alloys were mainly η’ phases. The grain boundary precipitates(GBPs) of 7 N01-I alloy distributed discontinuously, while those of 7 N01-II alloy distributed continuously. The strength of two 7 N01 alloys was similar, but the maximum corrosion depth of 7 N01-I alloy was less than that of 7 N01-II alloy, because the discontinuous GBPs and the lower recrystallization degree of outer surface of 7 N01-I alloy were favorable for improving corrosion behavior. Different models of strengthening mechanism were discussed, and the corrosion behavior was correlated with microstructure.通过透射电子显微镜(TEM)和配备电子背散射衍射(EBSD)的扫描电子显微镜(SEM)研究晶粒形貌和析出相对两种工业7N01合金的力学性能和腐蚀行为的影响。7N01-I合金外表面再结晶度低于7N01-II合金。两种合金的强化相均为η’相。7N01-I合金的晶界析出相(GBPs)断续分布,而7N01-II合金的晶界析出相连续分布。两种合金的强度接近,但7N01-I合金的最大腐蚀深度小于7N01-II合金,这是因为7N01-I合金外表面的低再结晶度和断续的GBPs有利于提高耐蚀性。讨论不同的强化机制,并分析显微组织与腐蚀行为的相关性。

关 键 词：7N01 alloys MICROSTRUCTURE mechanical properties corrosion behavior 

分 类 号：TG146.21[一般工业技术—材料科学与工程]