Dynamic fracture behavior of SA508-3 steel for nuclear power equipment under medium-and low-loading rates
Author:
Yao Di1, Li Yilei1, Jiang Xiaosong1ORCID, Luo Jiacheng1, Yu Li1, Tang Peng1, Luo Juan1
Affiliation:
1. Nuclear Power Institute of China , Chengdu , Sichuan , China
Abstract
Abstract
The heat treatment of SA508-3 steel was carried out by means of quenching and manual aging. The microstructure and mechanical properties of the prepared SA508-3 steel were analyzed and tested. The results show that the main composition of the matrix of SA508-3 steel is bainite, and the main composition of the second phase is alloy cementite containing Fe, Mn and C. The second phase is distributed at both the matrix and grain boundaries. The second phase can prevent the dislocation from moving by fixing the dislocation, and the second phase at the grain boundary can strengthen the matrix by hindering the grain boundary movement. The stress-strain curves of SA508-3 steel under different loading rates show that when the strain rate is greater than 0.5 m s−1, the fracture mode of the steel is brittle fracture, and when the strain rate is less than 0.5 m s−1, the fracture mode of the steel is ductile-brittle bonding fracture. The second phase of the crack first diffuses to the grain boundary, reducing the strength of the grain boundary. When the loading rate is high, the second phase at the grain boundary cannot diffuse in time, and the material undergoes transgranular fracture and intergranular fracture.
Funder
China National Nuclear Corporation
Publisher
Walter de Gruyter GmbH
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
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