620℃超超临界二次再热机组用S31042钢力学性能及组织演化

doi:10.13334/j.0258-8013.pcsee.200347

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620℃超超临界二次再热机组用S31042钢力学性能及组织演化

更新时间：2025-07-03

- 620℃超超临界二次再热机组用S31042钢力学性能及组织演化
- Issue 17, Pages: 5583-5591(2020)
- 作者机构：
  
  1. 西安热工研究院有限公司
  2. 华能安源发电有限责任公司
- 作者简介：
- 基金信息：
- DOI：10.13334/j.0258-8013.pcsee.200347
  CLC： TM621
- Published：2020
- 稿件说明：
移动端阅览
[J]. 2020, (17): 5583-5591.
DOI：

[J]. 2020, (17): 5583-5591. DOI： 10.13334/j.0258-8013.pcsee.200347.

摘要

为评估S31042钢在620℃超超临界二次再热机组中的适用性

研究了华能安源电厂600℃/620℃/620℃超超临界二次再热机组高压高再S31042锅炉管在服役17367h过程中力学性能、断口形貌特征及微观组织演变。结果表明:服役后S31042钢力学性能良好

且随服役时间延长

室温屈服强度、650℃屈服强度、布氏硬度均呈上升趋势

与备品管相比服役17367h后各项指标分别上升25.5%、46.3%和20.46%。冲击韧性在服役初期迅速下降

之后趋于稳定。服役后显微组织未见明显老化

S31042的析出相包括固溶处理未溶解的一次MX相、一次Z相和新析出的M

型碳化物、二次Z相

服役后主要强化相为M23C6和二次Z相

M23C6主要分布于晶界及晶界附近晶内

Z相主要分布在晶内

服役17367h后

晶界M23C6长大至400～650 nm

细小的Z相均匀分布于晶内

并未发现σ相析出

讨论了微观组织演变对力学性能变化的影响。综上所述

S31042钢可满足620℃超超临界二次再热机组高压高再力学性能及微观组织的相关要求。

Abstract

The applicability of S31042 austenitic boiler tubes in the 620℃ double reheat ultra-supercritical（USC） power plant was evaluated. The mechanical properties

fracture characteristics and the microstructure evolution of S31042 steel were investigated after served for different time（0

3191

6219

14167

17367 h） in a 600℃/620℃/620℃ double reheat USC unit of Huaneng Anyuan power plant. Results indicated that the mechanical properties of S31042 steel were excellent after service. The room temperature yield strength

650℃ yield strength and Brinell hardness of the S31042 steel all increased with the extension of the service time. After served for 17367 h

each index increased by 25.5%

46.3% and 20.46% re

spectively. The impact toughness decreased rapidly at the beginning of the service

and then tended to be stable. Obvious aging was not observed in the microstructures after service. The precipitates of S31042 included primary MX

primary Z-phase

new M

carbides and secondary Z-phase. After service

the main strengthening phases were M

carbides and secondary Z-phase

the M

carbides were mainly distributed along the grain boundaries or nearby

the secondary Z-phases distributed in the matrix. After exposed for 17367 h

the grain boundary M

carbides grew to 400～650 nm. No σ phase has been found. The relationship between the microstructure evolution and mechanical properties was also discussed. In summary

the S31042 boiler tubes can meet mechanical and microstructural requirements of the 620℃ double reheat USC unit.

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