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。
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)。
