Microstructural evolution of 12%Cr martensite steel weld joint at high temperature for 45000hours service

CHEN Delong; WANG Hongzhe; HOU Shufang; LIANG Faguang; WANG Jungang

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Microstructural evolution of 12%Cr martensite steel weld joint at high temperature for 45000hours service

Thermal Power Generation Vol. 43, Issue 1, Pages: 69-73(2014)

更新时间：2025-09-28

- Microstructural evolution of 12%Cr martensite steel weld joint at high temperature for 45000hours service
- 作者机构：
  
  1. 国电泰州发电有限公司
  2. 西安热工研究院有限公司
- 作者简介：
- 基金信息：
- DOI：
  CLC： TG441
- Published：2014
- 稿件说明：
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CHEN Delong, WANG Hongzhe, HOU Shufang, et al. Microstructural evolution of 12%Cr martensite steel weld joint at high temperature for 45000hours service[J]. Thermal Power Generation, 2014, 43(1): 69-73.
DOI：

CHEN Delong, WANG Hongzhe, HOU Shufang, et al. Microstructural evolution of 12%Cr martensite steel weld joint at high temperature for 45000hours service[J]. Thermal Power Generation, 2014, 43(1): 69-73. DOI：

摘要

通过金相、碳复型萃取、投射电子显微镜(TEM)、扫描电子显微镜(SEM)、X射线能谱(EDS)等方法对600℃服役约45 000h的12%Cr马氏体钢焊缝金属的显微组织结构进行了分析

研究影响12%Cr马氏体钢高温服役退化的因素。结果表明

该12%Cr马氏体钢焊缝金属的组织结构较服役前发生很大变化:(1)大量Laves相在晶界和板条界沉淀析出呈链状分布;(2)M23C6型碳化物发生粗化;(3)Z相以消耗MX为代价在晶界和亚晶界沉淀析出。沉淀相粗化导致强化效果下降

阻止亚晶长大的能力下降。

Abstract

Aiming at finding out the relationship between microstructural evolution and degradation of creep rupture strength

the microstructural evolution of the weld joint metal 12%Cr martensite steel used for superheater header after 45 000hours service at 600℃ has been investigated

by means of carbon replica extraction method

transmission electron microscopy(TEM)and energy dispersive spectroscopy(EDS).The results show that

the microstructure of weld joint metal 12%Cr martensite steel after 45 000hours service at high temperature changed significantly:(1)the Laves phase precipitated along the martensite lath boundaries and the prior austenite grain boundaries;(2)the M23 C6 carbides coarsened;(3)the Z phase formatted around the prior austenite grain boundaries and the packet boundaries by consuming the MX carbonitrides.Coarsen of the precipitated phase resulted in decrease in strengthening effect and inhibiting ability for subgrain's growth.Furthermore

the precipitation of Z phase consumed large amount of MX carbonitrides

causing the tempering martensite recovered and the subgrain structure coarsened

which affected the high temperature creep rupture strength of the 12%Cr martensite steel seriously.

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