Improvement of High Temperature Creep Strength of Conventional Grade 91 Steel by Thermomechanical Treatments

Volume 6B: Materials and Fabrication Pub Date : 2019-11-15 DOI:10.1115/pvp2019-93148

Rebeca Hernández, M. Serrano, A. García-Junceda, E. Oñorbe, J. Vivas

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引用次数: 2

Abstract

The study of the enhanced creep strength of conventional ferritic-martensitic (F/M) grade 91 steel by a thermomechanical treatment (TMT) to increase the precipitation of MX particles in the matrix was performed. Creep properties were evaluated by tests at constant load at temperatures that varied from 600 °C to 700 °C with different levels of stress for both steels: T91 and T91-TMT. The creep curves and main parameters for both steels in the different conditions were analysed. Results show a great improvement of creep strength of the T91 after the thermomechanical treatment in comparison with the conventional steel. T91-TMT presents a rupture life significantly higher than T91 and a decrease of the values of the minimum creep rate. An increase of the density of MX precipitates in the matrix of the T91-TMT due to the thermomechanical treatment in comparison with T91 can be also observed. A change in the fractography was also detected. T91-TMT specimens showed signs of brittle fracture instead of the ductile fracture, with the common necking effect detected in the T91.

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热处理提高91级钢高温蠕变强度的研究

本文研究了通过增加基体中MX颗粒析出的热处理(TMT)提高91级铁素体-马氏体(F/M)钢的蠕变强度。对T91和T91- tmt两种钢，在600°C至700°C的恒定载荷和不同的应力水平下，通过测试来评估蠕变性能。分析了两种钢在不同条件下的蠕变曲线和主要参数。结果表明，热处理后的T91合金的蠕变强度较普通钢有较大提高。T91- tmt的断裂寿命显著高于T91，最小蠕变速率值显著降低。与T91相比，热处理后的T91- tmt基体中MX析出相的密度有所增加。断口形貌也发生了变化。T91- tmt试样表现为脆性断裂而非韧性断裂，T91中存在常见的颈缩效应。

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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Volume 6B: Materials and Fabrication

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