Hot workability characteristics of two A335 P92 steels for power plant application: A comparative study

Q2 Materials Science Engineering Solid Mechanics Pub Date : 2023-01-01 DOI:10.5267/j.esm.2023.2.001

J. Obiko, L. Chow, D. Whitefield, M. Bodunrin

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Abstract

The article reports on the workability of two P92 steels having a chromium content of 8.29 and 9.48 wt%. Constitutive equations were used to calculate material parameters describing the hot deformation flow stress. Hot deformation tests were conducted using the Gleeble® 3500 thermomechanical facility. Test conditions were: temperature of 850-1000°C and strain rate of 0.1-10s-1 to a strain of 0.5. The flow stress curve results show that dynamic recovery was the only softening mechanism. A comparative study of the two steels revealed that Cr content had a marginal significance on the flow stress behaviour. Constitutive analysis results of the material parameters were: a stress exponent of 9.0 (P92-A), and 11.0 (P92-B), while the activation energy was 369 kJmol-1 (P92-A), and 472 kJmol-1 (P92-B). A brief explanation of the material parameter results is in this article. A flow stress model was developed to predict the flow stress behaviour of the two P92 steels investigated. The results show that the model accurately predicts the flow stress at all the deformation conditions applied. The statistical parameters showed a good correlation between the predicted and the experimental data. Therefore, this model can be used to develop metal forming schedules for industrial applications.

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两种电厂用a335p92钢热加工性能的比较研究

本文报道了两种铬含量分别为8.29和9.48 wt%的P92钢的加工性。采用本构方程计算描述热变形流应力的材料参数。热变形试验使用Gleeble®3500热机械设备进行。试验条件为:温度850-1000℃，应变速率0.1-10s-1至应变0.5。流变应力曲线结果表明，动态恢复是唯一的软化机制。两种钢的对比研究表明，Cr含量对流动应力行为具有边际意义。材料参数的本构分析结果为:应力指数为9.0 (P92-A)和11.0 (P92-B)，活化能为369 kJmol-1 (P92-A)和472 kJmol-1 (P92-B)。本文对材料参数结果作了简要说明。建立了流动应力模型来预测所研究的两种P92钢的流动应力行为。结果表明，该模型能准确地预测各种变形条件下的流变应力。统计参数表明，预测值与实验值具有良好的相关性。因此，该模型可用于制定工业应用的金属成形时间表。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Engineering Solid Mechanics Materials Science-Metals and Alloys

CiteScore

3.00

自引率

0.00%

发文量

期刊介绍： Engineering Solid Mechanics (ESM) is an online international journal for publishing high quality peer reviewed papers in the field of theoretical and applied solid mechanics. The primary focus is to exchange ideas about investigating behavior and properties of engineering materials (such as metals, composites, ceramics, polymers, FGMs, rocks and concretes, asphalt mixtures, bio and nano materials) and their mechanical characterization (including strength and deformation behavior, fatigue and fracture, stress measurements, etc.) through experimental, theoretical and numerical research studies. Researchers and practitioners (from deferent areas such as mechanical and manufacturing, aerospace, railway, bio-mechanics, civil and mining, materials and metallurgy, oil, gas and petroleum industries, pipeline, marine and offshore sectors) are encouraged to submit their original, unpublished contributions.