Microstructure investigation on S30432 steel used for heating surface tubes of a double-reheat boiler

LI Ji; CHEN Zhi; TANG Liying; HOU Shufang; WANG Bohan; ZHOU Rongcan

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Microstructure investigation on S30432 steel used for heating surface tubes of a double-reheat boiler

Thermal Power Generation Issue 7, (2017)

更新时间：2025-09-28

- Microstructure investigation on S30432 steel used for heating surface tubes of a double-reheat boiler
- 作者机构：
  
  1. 西安热工研究院有限公司,陕西,西安,710032
  2. 华能安源发电有限责任公司,江西,萍乡,337016
- 作者简介：
- 基金信息：
- DOI：
  CLC： TG113
- Published Online：02 August 2017，
  
  Published：2017
- 稿件说明：
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LI Ji, CHEN Zhi, TANG Liying, et al. Microstructure investigation on S30432 steel used for heating surface tubes of a double-reheat boiler[J]. Thermal Power Generation, 2017, (7).
DOI：

LI Ji, CHEN Zhi, TANG Liying, et al. Microstructure investigation on S30432 steel used for heating surface tubes of a double-reheat boiler[J]. Thermal Power Generation, 2017, (7). DOI：

摘要

针对某超超临界二次再热机组锅炉高温受热面用S30432奥氏体不锈钢（S30432钢）服役约6 200 h后组织性能变化，采用扫描电镜、X射线能谱分析仪、透射电镜等，观察该锅炉高压再热器、末级过热器和低压再热器管样运行后氧化层的表面形貌和元素分布特征，并对晶内、晶界析出相和位错组态进行分析对比。结果表明：运行后各部件组织稳定性较好，试样表面有致密的Cr2O3生成，厚度约200~400 nm；晶内有大量细小的ε-Cu相和NbC(N)颗粒析出，分别约为10~20 nm和50 nm，在晶内均匀分布，能有效钉扎位错；晶界及三叉晶界处有颗粒状的M23C6不连续分布，尺寸在100~400 nm；高压再热器管由于服役温度较高，析出相的平均尺寸略大于其他试样。

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