MICROSTRUCTURE ANALYSIS OF HIGH-TEMPERATURE BOLTS MADE FROM 12% Cr STEEL AFTER LONG-TERM OPERATION UNDER ELEVATED TEMPERATURE

OUYANG Jie1; ZHANG Xiaoyu1; KE Hao1; WU Nan1; YAN Guangzong1; ZHANG Jinli2 1.Hebei Provincial Electric Power Research Institute

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MICROSTRUCTURE ANALYSIS OF HIGH-TEMPERATURE BOLTS MADE FROM 12% Cr STEEL AFTER LONG-TERM OPERATION UNDER ELEVATED TEMPERATURE

更新时间：2025-09-28

- MICROSTRUCTURE ANALYSIS OF HIGH-TEMPERATURE BOLTS MADE FROM 12% Cr STEEL AFTER LONG-TERM OPERATION UNDER ELEVATED TEMPERATURE
- Thermal Power Generation Vol. 41, Issue 3, Pages: 48-50(2012)
- 作者机构：
  
  1. 河北省电力研究院
  2. 保定热电厂
- 作者简介：
- 基金信息：
- DOI：
  CLC： TG142.4
- Published：2012
- 稿件说明：
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OUYANG Jie1, ZHANG Xiaoyu1, KE Hao1, et al. MICROSTRUCTURE ANALYSIS OF HIGH-TEMPERATURE BOLTS MADE FROM 12% Cr STEEL AFTER LONG-TERM OPERATION UNDER ELEVATED TEMPERATURE[J]. Thermal power generation, 2012, 41(3): 48-50.
DOI：

OUYANG Jie1, ZHANG Xiaoyu1, KE Hao1, et al. MICROSTRUCTURE ANALYSIS OF HIGH-TEMPERATURE BOLTS MADE FROM 12% Cr STEEL AFTER LONG-TERM OPERATION UNDER ELEVATED TEMPERATURE[J]. Thermal power generation, 2012, 41(3): 48-50. DOI：

摘要

采用金相显微镜、扫描电镜、透射电镜等手段考察了不同运行阶段12%Cr钢高温螺栓的微观组织变化。经与新螺栓对比

结果表明受检螺栓的组织中

局部区域δ铁素体含量超过10%。螺栓运行6万h后

其金相组织逐渐老化

碳化物沿δ铁素体边界析出

合金元素开始向碳化物迁移

材料进入老化初期;运行35万h后

碳化物颗粒粗化更加明显

沿δ铁素体边界已形成粗大的碳化物链

合金元素向碳化物中迁移严重

材料进入老化后期。

Abstract

By adopting means

such as metallographic microscope

scanning electron microscope

and transmitting electron microscope etc.

the microstructure variation of high-temperature bolts made from 12%Cr steel has been investigated.Through comparison with that of the new bolts

the results show that the δferrite content in some localities of structure for the investigated bolts has been over 10%.After the bolt being in operation for 60-thousand hours

its metallographic structure has gradually aged

the carbides being separated out along the boundaries of δ ferrite

the alloy elements start migrating to the carbides

the material entered into initial period of aging;after being in operation for 350-thousand hours

the coarsening of carbide particles being more remarkable

chains of rough and large carbides have been formed along the boundaries of δ ferrite

the material has already entered into the final stage of aging.

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Related Author

ZHANG Hongjun1 1.Xi'an Thermal Power Research Institute Co.Ltd.

TANG Liying1

ZHOU Rongcan1

HOU Shufang1

NIE Ming2

YU Zaisong1

KE Hao

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Related Institution

Xi'an Thermal Power Research Institute Co., Ltd

Guangdong Power Grid Corporation Electric Power Science Research Institute

Department of Materials Science, School of Power and Machinery, Wuhan University

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