Control of the concentrated-precipitation behaviour of Cr23C6 and its effect on the microstructure and properties of S600E sorbitic stainless steel
Year: 2024
Type: article
Abstract: The influences of heat treatment on the microstructure, element distribution, precipitation behaviour , mechanical properties, and corrosion resistance of S600E sorbitic stainless steel were studied. The influence of heat treatment on the precipitation kinetics of Cr 23 C 6 was analysed through theoretical calculations. The results showed that the compositional nonuniformity of the hot-rolled experimental steel was eliminated with increasing solution temperature. The proportion of high-angle boundaries increased and the tempered sorbite structure coarsened with increasing tempering temperature. The main precipitated phases in the sorbitic stainless steel included large-sized Cr 23 C 6 distributed along the grain boundaries and Nb and Ti carbides uniformly distributed within the grains. The temperatures with the fastest precipitation of M 23 C 6 and MX phases were 870 °C and 950 °C, respectively, and the precipitation of MX could suppress the concentrated precipitation of Cr 23 C 6 at the grain boundaries. By regulating the heat treatment process , the grain boundary area in the tempered sorbite structure was increased, the dissolution of Cr 23 C 6 was promoted, and the precipitation kinetics of Cr 23 C 6 were reduced, which suppressed the concentrated precipitation of Cr 23 C 6 at the grain boundaries. Therefore, the mechanical properties and chloride pitting corrosion resistance of S600E sorbitic stainless steel were improved.
Authors: Chenglin Zhu, Xiuhua Gao, Changyou Zhu, Wang Li, Cairu Gao, Zhenguang Liu, Chi Yu
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,430
OpenAlex ID: W4404296688