THE CARBIDE CONTAINED IN HCM25(T23) STEEL AND EVOLUTION REGULARITY THEREOF

YU Zaisong1; NIE Ming2; HOU Shufang1; ZHOU Rongcan1; TANG Liying1; ZHANG Hongjun1 1.Xi'an Thermal Power Research Institute Co.Ltd.

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THE CARBIDE CONTAINED IN HCM25(T23) STEEL AND EVOLUTION REGULARITY THEREOF

Thermal Power Generation Vol. 41, Issue 9, Pages: 1-6(2012)

更新时间：2025-09-28

- THE CARBIDE CONTAINED IN HCM25(T23) STEEL AND EVOLUTION REGULARITY THEREOF
- 作者机构：
  
  1. 西安热工研究院有限公司
  2. 广东电网公司电力科学研究院
- 作者简介：
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- DOI：
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- Published：2012
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YU Zaisong1, NIE Ming2, HOU Shufang1, et al. THE CARBIDE CONTAINED IN HCM25(T23) STEEL AND EVOLUTION REGULARITY THEREOF[J]. Thermal Power Generation, 2012, 41(9): 1-6.
DOI：

YU Zaisong1, NIE Ming2, HOU Shufang1, et al. THE CARBIDE CONTAINED IN HCM25(T23) STEEL AND EVOLUTION REGULARITY THEREOF[J]. Thermal Power Generation, 2012, 41(9): 1-6. DOI：

摘要

通过TEM、SEM和EDS等方法对正火态、正火+回火态、高温服役老化和蠕变断裂T23钢试样的碳化物状态进行分析

探讨T23钢碳化物的演化规律及其对性能的影响。研究结果表明:(1)T23钢在热处理(正火+回火)及后来的高温运行蠕变过程中出现了M3C、M2C、M7C3、M23C6和M6C共5种碳化物;(2)正火态T23钢第二相主要为M3C

回火过程中M3C发生球化并回溶消失

析出亚稳相(Cr、Fe)7C3和Mo2C

最终大部分碳化物转变为M23C6型碳化物;(3)高温服役老化或高温蠕变后M23C6型碳化物发生Ostwald熟化

晶内小颗粒M23C6型碳化物逐渐消失

晶界上大颗粒碳化物聚集长大、粗化并呈链状分布。随着运行温度的升高和运行时间的延长

M23C6型碳化物逐渐转变为富W的M6C相。大颗粒碳化物沿晶界聚集长大

并呈链状分布

尤其是富W的M6C相的大量出现是T23性能发生退化的主要原因。

Abstract

By TEM

SEM and EDS etc analysis

the carbides contained in samples of T23 steel after aging in service and creep rupture under high temperature was analyzed

and an approach to the evolution regularity of carbides and its influence upon the performance degradation were made.Results show that:(1) during heat treatment and the subsequence high temperature service of the T23 steel

five kinds of carbide

i.e.M3C

M2C

M7C3

M23C6

and M6C appear;(2) the second-phase in T23 steel under normal condition is mainly composed of M3C

which spheroidized in the tempered process

and then disappeared in re-dissoluation

metastable phase compounds such as(Cr

Fe)7C3 and Mo2C are precipitated

and finally most carbides are transformed into carbide M23C6;(3) Ostwald ripening of M23C6 occurs during service aging or creep rupture under high temperature;particle of M 23 C with small size inside the lattice disappeares gradually

that with large size at grain boundary coagulates and grows

coarsening and forming chain-shaped distribution;as the temperature growing and the operation time prolonging

carbide M 23 C transforms gradually into W-riched M6C phase.Above is the major cause for performance degradation of the T23steel.

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