GH3128合金的高温流变行为与组织演变规律

doi:10.13251/j.issn.0254-6051.2020.06.030

金属热处理 ›› 2020, Vol. 45 ›› Issue (6): 141-148.DOI: 10.13251/j.issn.0254-6051.2020.06.030

GH3128合金的高温流变行为与组织演变规律

刘庭耀¹, 赖宇¹, 付建辉¹, 魏育君², 何云华², 裴丙红²

1. 攀钢集团研究院有限公司, 四川成都 610000;
2. 攀钢集团江油长城特殊钢有限公司, 四川江油 621704

收稿日期:2019-12-09 出版日期:2020-06-25 发布日期:2020-09-02
作者简介:刘庭耀(1988—),男,工程师,硕士,主要研究方向为特殊钢冶炼工艺,E-mail:liutingyao8211371@163.com

High temperature rheological behavior and microstructure evolution of GH3128 alloy

Liu Tingyao¹, Lai Yu¹, Fu Jianhui¹, Wei Yujun², He Yunhua², Pei Binghong²

1. Pangang Group Research Institute Co., Ltd., Chengdu Sichuan 610000, China;
2. Pangang Group Jiangyou Changcheng Special Steel Co., Ltd., Jiangyou Sichuan 621704, China

Received:2019-12-09 Online:2020-06-25 Published:2020-09-02

摘要/Abstract

摘要： 通过对GH3128合金进行热模拟压缩试验,研究了该合金在变形温度950~1150 ℃、应变速率0.01~10 s^-1及应变量30%~70%条件下的流变特征。通过绘制合金流变应力曲线,并基于Arrhenius模型建立了GH3128合金的本构方程。在此基础上,获取了变形量30%~65%的材料加工图,并结合GH3128合金完全再结晶条件图,明确了合金在高温变形过程中组织演变同塑性变形参数之间关系。此外,通过对碳化物的金相分析,探明了合金在热变形过程中碳化物的演变规律。结果表明:GH3128合金热加工激活能约为305 kJ/mol,合理的加工区域为:变形温度1050~1100 ℃,应变速率0.1 s^-1左右。此时合金内碳化物基本回溶,组织再结晶充分,晶粒尺寸可控制在10 μm以下。

关键词: GH3128合金, 本构方程, 热加工图, 动态再结晶, 碳化物

Abstract: Rheological characteristics of the GH3128 alloy at deformation temperature of 950-1150 ℃, strain rate of 0.01-10 s^-1 and strain rate of 30%-70% were studied by means of thermal simulation compression test. The constitutive equation of the GH3128 alloy was established based on the flow stress curves of the alloy and the Arrhenius model, and the hot processing map with deformation of 30%-65% was obtained. The relationship between the microstructure evolution and the plastic deformation parameters of the alloy during high temperature deformation was determined by combining the complete recrystallization condition diagram. Through the metallographic analysis, the evolution of carbides during hot deformation was investigated. The results show that the activation energy for hot working of the alloy is about 305 kJ/mol, and the reasonable processing zone is: deformation temperature 1050-1100 ℃, strain rate about 0.1 s^-1, in which the carbide in the alloy is substantially dissolved back, the microstructure is recrystallized sufficiently, and the grain size can be controlled to be less than 10 μm.

Key words: GH3128 alloy, constitutive equation, hot processing map, dynamic recrystallization, carbide

中图分类号:

TG146

刘庭耀, 赖宇, 付建辉, 魏育君, 何云华, 裴丙红. GH3128合金的高温流变行为与组织演变规律[J]. 金属热处理, 2020, 45(6): 141-148.

Liu Tingyao, Lai Yu, Fu Jianhui, Wei Yujun, He Yunhua, Pei Binghong. High temperature rheological behavior and microstructure evolution of GH3128 alloy[J]. Heat Treatment of Metals, 2020, 45(6): 141-148.

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GH3128合金的高温流变行为与组织演变规律

High temperature rheological behavior and microstructure evolution of GH3128 alloy

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