|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals and Materials
||Formation of the Carbon-enriched Zone and its Evolution During the Long-term Aging Process for 9%Cr-CrMoV Dissimilar Welded Joint
||Kai Ding, Bingge Zhao, Yuanheng Zhang, Tao Wei, Guanzhi Wu, Yuanfang Wang, Yulai Gao
|On-Site Speaker (Planned)
The appearance of carbon migration in the 9%Cr-CrMoV dissimilar welded joint was resulted from the sharp content transition of the strong carbide forming element Cr between the weld (~2.3 wt. %) and the base metal (~10.6 wt. %). The width of the carbon-enriched zone (CEZ) under original state was about 46 μm, the width of CEZ increased and then kept in 65 μm during the 10,000h aging treatment. The microhardness test showed that the carbon-depleted zone (CDZ) exhibited low hardness value (~220 HV) compared with that (~340 HV) in CEZ. The significant difference in the content of the carbides was the crucial cause to result in the sharp change of hardness at the fusion line. Thus, there exists the necessity to evaluate and analyze the evolution of the CEZ to experience a long-term aging for avoiding its negative influence on the impact toughness and fatigue performance.