国产TP310HCbN钢在高温应力下的组织结构

doi:10.11930/j.issn.1004-9649.2012.10.42.5

摘要/Abstract

摘要： 为探讨TP310HCbN的强化机理和失效原因,借助透射电镜和扫描电镜对国产TP310HCbN钢在高温应力作用下的组织结构进行研究。结果表明：经高温应力作用,晶内析出面心立方结构的M₂₃C₆碳化物和简单四方结构的NbCrN,晶界也析出M₂₃C₆碳化物,长时间试验条件下M₂₃C₆上析出σ相;高温应力下析出的M₂₃C₆和NbCrN提高了TP310HCbN钢持久断裂试样的硬度;晶内和晶界析出的M₂₃C₆碳化物的晶格常数均为基体的3倍,并与基体保持完全共格关系;随着试验时间延长,M₂₃C₆碳化物数量增多。对于国产TP310HCbN钢,在运行环境下需关注σ相和碳化物的分布、尺寸及其数量。

关键词: TP310HCbN钢, 组织结构, 高温应力, M23C6, σ, 相, NbCrN, 硬度

Abstract: In order to investigate the strengthening mechanism and failure of domestic TP310HCbN steel, the microstructure of domestically-made TP310HCbN steel under different stress at high temperature by means of transmission electron microscopy(TEM) and scanning electron microscopy(SEM) is studied. The results show that the precipitates after the creep-rupture test are M23C6 carbides with face centered cubic (FCC) structure located both inside grains and at grain boundaries and NbCrN nitride particles with tetragonal structure dispersed within grains. After long time creep-rupture testing, σ phase precipitated. The hardness of the creep-rupture samples is enhanced due to the dispersed M23C6 and NbCrN particles. M23C6 carbides with lattice parameter of three times of the austenite matrix grow in a cube to cube orientation relationship with the matrix. The amount of M23C6 carbide particles increases with the testing time extended. For the domestic TP310HCbN steel, more attention should be paid to the distribution, size and amount of σ phase and M23C6 during service.

中图分类号:

TM712

郭岩, 林琳, 侯淑芳, 王博涵. 国产TP310HCbN钢在高温应力下的组织结构[J]. 中国电力, 2012, 45(10): 42-47.

GUO Yan, LIN Lin, HOU Shu-fang WANG Bo-han. Microstructure of Domestic TP310HCbN Steel After High-Temperature Creep-Rupture Test[J]. Electric Power, 2012, 45(10): 42-47.

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https://www.electricpower.com.cn/CN/Y2012/V45/I10/42

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