| 含铝节镍型奥氏体耐热钢(AFA钢)的热变形行为与热加工图 |
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| 引用本文： | 张敬瑞,赵艳君,苏科.含铝节镍型奥氏体耐热钢(AFA钢)的热变形行为与热加工图[J].金属热处理,2023,48(3):166-173. |
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| 作者姓名： | 张敬瑞 赵艳君 苏科 |
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| 作者单位： | 1.广西大学 资源环境与材料学院, 广西 南宁 530004; 2.广西大学 省部共建特色金属材料与组合结构全寿命安全国家重点实验室, 广西 南宁 530004 |
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| 基金项目： | 国家自然科学基金(51661004);广西创新驱动项目(桂科AA18242003-3);省部共建特色金属材料与组合结构全寿命安全国家重点实验室项目(GXYSSF1809) |
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| 摘 要： | 为了预测含铝节镍型奥氏体耐热钢(AFA钢)的热变形行为，利用Gleeble-3500热力模拟试验机对AFA钢进行了温度950～1150℃、应变速率0.01～10 s-1、真应变为0.51～1.2的高温热压缩试验，构建了本构方程，并建立了热加工图。结果表明，在同一应变速率下，随着变形温度的升高，AFA钢的流变应力逐渐降低，在同一变形温度下，随着应变速率的增加，流变应力随之增加。在真应变为0.69(变形量为50%)下，预测应力与实际应力的线性相关系数R2为0.998 53,随着应变的增加，材料的失稳区域先减小后增大，集中于低温区；高效率区域变大，且高效率区域集中于变形温度为1100～1150℃、应变速率为0.01～0.1 s-1之间，说明AFA钢适合在高温低应变速率的情况下进行热加工。
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| 关 键 词： | 含铝奥氏体耐热钢(AFA钢) 本构方程 热加工图 热变形 |
| 收稿时间： | 2022-10-20 |
Hot deformation behavior and hot working diagram of alumina-forming austenitic (AFA) steel |
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| Zhang Jingrui,Zhao Yanjun,Su Ke.Hot deformation behavior and hot working diagram of alumina-forming austenitic (AFA) steel[J].Heat Treatment of Metals,2023,48(3):166-173. |
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| Authors: | Zhang Jingrui Zhao Yanjun Su Ke |
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| Affiliation: | 1. School of Resources Environment and Materials, Guangxi University, Nanning Guangxi 530004, China; 2. State Key Laboratory of Featured Metal Materials and Life-Cycle Safety for Composite Structures, Guangxi University, Nanning Guangxi 530004, China |
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| Abstract: | In order to predict the thermal deformation behaviour of AFA steel, high temperature hot compression experiments were carried out on the AFA steel at temperatures of 950-1150 ℃, strain rates of 0.01-10 s-1 and true strains of 0.51-1.2 using a Gleeble-3500 thermal simulation tester to construct the instantonal equations and build up a thermal processing map. The results show that the rheological stress of the AFA steel gradually decreases with increasing deformation temperature at the same strain rate, and increases with increasing strain rate at the same deformation temperature. The linear correlation coefficient R2 is 0.998 53 between predicted and actual stresses at a true strain of 0.69 (50% deformation). The thermal processing map shows that as the strain increases, the instability region of the AFA steel first decreases and then increases, concentrated in the low temperature region. The high-efficiency region becomes larger and the high efficiency region is concentrated at deformation temperatures between 1100 ℃ to 1150 ℃ with strain rates of 0.01 s-1 to 0.1 s-1, indicating that the AFA steel is suitable for thermal processing at high temperatures and low strain rates. |
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| Keywords: | Alumina-forming austenitic steel principal equation thermal processing map thermal deformation |
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