Creep Resistance and Structure of 10% Cr–3% Сo–2% W–0.29% Cu–0.17% Re Steel with Low Nitrogen and High Boron Contents for Unit Components of Coal Power Plants

IF 1.8 4区材料科学 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Physical Mesomechanics Pub Date : 2024-02-08 DOI:10.1134/s1029959924010090

A. Fedoseeva

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Abstract

The creep resistance and structure of 10% Cr–3% Сo–2% W–0.29% Cu–0.17% Re steel with 0.1% carbon, low nitrogen content and high boron content were investigated by creep rupture testing at a temperature of 650°C and stresses from 200 to 100 MPa applied in 20-MPa increments. For comparison, 9% Cr steel with 0.1% carbon, 0.05% nitrogen, and 0.005% boron was considered. The steels were subjected to preliminary heat treatment including normalizing at 1050°C for 1 hour, tempering at 750–770°C for 3 hours, and cooling in air. The structures of both heat-treated steels exhibited martensite laths with boundaries pinned by М₂₃С₆ carbides, and the rearrangement of dislocations was retarded by MX particles. A significant difference between 10% Cr and 9% Cr steels was the presence of fine М₂₃С₆ carbide particles characterized by orientational relationships with the ferrite matrix and MX carbonitrides, whose volume fraction was 6 times lower. Short-term tensile tests at room temperature showed no differences between the steels, while the creep rupture strength of 10% Cr steel was 13% higher than for 9% Cr steel. The creep deformation mechanism of the steels was also different. Structural analysis of 10% Cr steel after creep tests revealed no substantial changes in its lath structure: the lath width increased by only 58% and the dislocation density was reduced by a factor of 2. Comparison with 9% Cr steel showed that the good structural stability of 10% Cr steel during creep is caused by the high coarsening resistance of second phase particles, whose coarsening rate is 1-2 orders of magnitude lower than that in 9% Cr steel.

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用于煤电厂机组部件的低氮高硼含量 10% Cr-3% Сo-2% W-0.29% Cu-0.17% Re 钢的抗蠕变性和组织结构

摘要通过蠕变断裂试验研究了含 0.1%碳、低氮和高硼的 10%Cr-3%Сo-2%W-0.29%Cu-0.17%Re钢的抗蠕变性和结构，试验温度为 650°C，应力从 200 兆帕到 100 兆帕，以 20 兆帕为增量。作为对比，还考虑了含 0.1% 碳、0.05% 氮和 0.005% 硼的 9% 铬钢。钢材经过初步热处理，包括在 1050°C 正火 1 小时，在 750-770°C 回火 3 小时，然后在空气中冷却。两种热处理钢的结构都呈现出马氏体板条，其边界由М23С6碳化物钉住，MX颗粒阻碍了位错的重新排列。10% 铬钢和 9% 铬钢之间的一个显著区别是存在细小的М23С6 碳化物颗粒，其特征是与铁素体基体和 MX 碳氮化物之间存在取向关系，其体积分数低 6 倍。室温下的短期拉伸试验显示，两种钢之间没有差异，而 10% Cr 钢的蠕变断裂强度比 9% Cr 钢高 13%。两种钢的蠕变变形机制也不同。蠕变试验后对 10% 铬钢的结构分析表明，其板条结构没有发生实质性变化：板条宽度仅增加了 58%，位错密度降低了 2 倍。与 9% 铬钢的比较表明，10% 铬钢在蠕变过程中具有良好的结构稳定性是由于第二相颗粒具有较高的抗粗化能力，其粗化率比 9% 铬钢低 1-2 个数量级。

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来源期刊

Physical Mesomechanics Materials Science-General Materials Science

CiteScore

3.50

自引率

18.80%

发文量

期刊介绍： The journal provides an international medium for the publication of theoretical and experimental studies and reviews related in the physical mesomechanics and also solid-state physics, mechanics, materials science, geodynamics, non-destructive testing and in a large number of other fields where the physical mesomechanics may be used extensively. Papers dealing with the processing, characterization, structure and physical properties and computational aspects of the mesomechanics of heterogeneous media, fracture mesomechanics, physical mesomechanics of materials, mesomechanics applications for geodynamics and tectonics, mesomechanics of smart materials and materials for electronics, non-destructive testing are viewed as suitable for publication.