Year: 2021
Type: article
Abstract: The carbide transformation of Cr35Ni45Nb type alloy during service has been investigated in the present work. The primary carbide of the as-cast Cr35Ni45Nb type alloy is M 7 C 3 (M is mainly Cr element) and NbC, which transformed into M 23 C 6 type carbides (M is mainly Cr element) and G phase(Ni 16 Nb 6 Si 7 ) after service, respectively. The G phase and M 23 C 6 carbides mix together and grow up with each other during service. After carburization, the crystal structure of M 23 C 6 type carbide changes again and transforms into M 7 C 3 type carbide. The mechanism of M 23 C 6 → M 7 C 3 carbide reaction is an in situ transformation; the M 7 C 3 type carbide preferentially nucleates at the interface of M 23 C 6 / γ and grows toward the M 23 C 6 type carbide interior. With the diffusion of free carbon atoms into the M 23 C 6 type carbides, the M 23 C 6 type carbides are gradually surrounded by the M 7 C 3 type carbides until they are completely changed into M 7 C 3 type carbides.
Source: Materials Research Express
Authors: Jingfeng Guo, Tieshan Cao, Congqian Cheng, Jie Zhao
Institutions: Yichun University, Dalian University of Technology
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,530
OpenAlex ID: W3200417068