高导高强钢的组织性能及微合金相的析出行为

doi:10.13251/j.issn.0254-6051.2024.06.025

金属热处理 ›› 2024, Vol. 49 ›› Issue (6): 150-158.DOI: 10.13251/j.issn.0254-6051.2024.06.025

高导高强钢的组织性能及微合金相的析出行为

唐兴昌^1,2, 周维莲¹, 祁大洋³, 贾志晖³, 张志坚¹, 程刚虎¹, 侯园园¹

1.兰州理工大学材料科学与工程学院, 甘肃兰州 730050;
2.兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室, 甘肃兰州 730050;
3.江苏省镔鑫钢铁集团有限公司, 江苏连云港 222000

收稿日期:2023-03-03 修回日期:2024-05-02 出版日期:2024-06-25 发布日期:2024-07-29
作者简介:唐兴昌(1981—),男,副研究员,博士,主要研究方向为钢铁及有色金属材料,E-mail: tangxingchanglut@163.com
基金资助:
国家自然科学基金(52061022);嘉峪关市科技重大专项(22-02)

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

Tang Xingchang^1,2, Zhou Weilian¹, Qi Dayang³, Jia Zhihui³, Zhang Zhijian¹, Cheng Ganghu¹, Hou Yuanyuan¹

1. School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou Gansu 730050, China;
2. State Key Laboratory of Advanced Processing and Reuse of Non-Ferrous Metals, Lanzhou University of Technology, Lanzhou Gansu 730050, China;
3. Jiangsu Binxin Steel Group Co., Ltd., Lianyungang Jiangsu 222000, China

Received:2023-03-03 Revised:2024-05-02 Online:2024-06-25 Published:2024-07-29

摘要/Abstract

摘要： 为研究高导高强钢中第二相粒子形变诱导析出行为与性能变化,利用Gleeble-3500热模拟试验机,进行应力松弛试验,之后使用金相显微镜、电感耦合等离子光谱发生仪(ICP)、维氏硬度仪、四探针电阻率仪等对钢进行组织性能观察与分析。试验结果表明,弛豫过程可以根据应力松弛曲线的斜率分为3个阶段,第一阶段发生再结晶,第二阶段发生形变诱导析出,第三阶段再结晶被抑制,析出长大。根据应力松弛曲线得到的PTT曲线为“S”型,鼻尖温度为950 ℃。在较高变形温度下,析出相快速析出,对位错产生钉轧,晶粒尺寸在减小。试验钢整体硬度较低,且波动较大,整体变化趋势无规律,在850 ℃变形时硬度最高。电阻率呈现出随变形温度上升先降低后上升的趋势,在800 ℃变形时电阻率最低。

关键词: 高导高强钢, 应力松弛, PTT曲线, 析出

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

中图分类号:

TG142.1

唐兴昌, 周维莲, 祁大洋, 贾志晖, 张志坚, 程刚虎, 侯园园. 高导高强钢的组织性能及微合金相的析出行为[J]. 金属热处理, 2024, 49(6): 150-158.

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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高导高强钢的组织性能及微合金相的析出行为

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

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