Microstructure, properties and microalloyed phase precipitation behavior of high-conductivity high-strength steel

doi:10.13251/j.issn.0254-6051.2024.06.025

Abstract

Abstract: In order to study the deformation-induced precipitation behavior and property changes of the second phase particles in high-conductivity high-strength steel, the stress relaxation experiment was carried out by using the Gleeble-3500 thermal simulation testing machine, and then the microstructure and properties of the tested steel were observed and analyzed by means of metallurgical microscope, inductively coupled plasma spectrometer (ICP), Vickers hardness tester, and four-probe resistivity meter. The test results show that the relaxation process can be divided into three stages according to the slope of the stress relaxation curve, the first stage is recrystallization, the second stage is deformation-induced precipitation, and the third stage is inhibited by recrystallization and precipitation grows. The PTT curve obtained from the stress relaxation curves is "S" type, and the nose tip temperature is 950 ℃. At higher deformation temperatures, the precipitated phase precipitates rapidly, and the dislocation is nailed, and the grain size decrease. The overall hardness of the tested steel is low and fluctuates greatly, and the overall change trend is irregular, and the hardness is the highest when deformed at 850 ℃. The resistivity decreases first and then increases with the increase of deformation temperature, and the resistivity is the lowest when deformed at 800 ℃.

Key words: high-conductivity high-strength steel, stress relaxation, PTT curve, precipitation

CLC Number:

TG142.1

Tang Xingchang, Zhou Weilian, Qi Dayang, Jia Zhihui, Zhang Zhijian, Cheng Ganghu, Hou Yuanyuan. Microstructure, properties and microalloyed phase precipitation behavior of high-conductivity high-strength steel[J]. Heat Treatment of Metals, 2024, 49(6): 150-158.

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