Analysis on high-cycle fatigue property of 25Cr2MoVA steel based on subsynchronous resonance risk

LIANG Jun; WANG Bin; DU Jinfeng; ZHANG Zheng; ZHAO Zihua

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Analysis on high-cycle fatigue property of 25Cr2MoVA steel based on subsynchronous resonance risk

Thermal Power Generation Vol. 45, Issue 5, Pages: 112-116(2016)

更新时间：2025-09-28

- Analysis on high-cycle fatigue property of 25Cr2MoVA steel based on subsynchronous resonance risk
- 作者机构：
  
  1. 神华国华(北京)电力研究院有限公司
  2. 北京航空航天大学材料科学与工程学院
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK263.61
- Published：2016
- 稿件说明：
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LIANG Jun, WANG Bin, DU Jinfeng, et al. Analysis on high-cycle fatigue property of 25Cr2MoVA steel based on subsynchronous resonance risk[J]. Thermal Power Generation, 2016, 45(5): 112-116.
DOI：

LIANG Jun, WANG Bin, DU Jinfeng, et al. Analysis on high-cycle fatigue property of 25Cr2MoVA steel based on subsynchronous resonance risk[J]. Thermal Power Generation, 2016, 45(5): 112-116. DOI：

摘要

超超临界机组汽轮机转子服役期所受的疲劳周次高于传统疲劳设计规范规定的循环周次

因此采用传统疲劳设计规范对汽轮机转子实际运行过程中超过108循环周次的部件进行疲劳寿命设计及分析是危险的。本文针对符合汽轮机转子材料要求的25Cr2MoVA钢进行了高周疲劳试验

基于无疲劳极限半对数曲线模型、有疲劳极限半对数曲线模型和有疲劳极限半对数双线性模型对疲劳试验数据拟合得到P-S-N曲线

并分析了疲劳断口形貌。结果表明:25Cr2MoVA钢108循环周次的条件疲劳强度极限为465 MPa;基于无疲劳极限模型拟合的P-S-N曲线分析超超临界百万机组汽轮机转子材料运行可靠性符合运行实际和材料本征特性要求;疲劳断口表明裂纹源均萌生于表面

裂纹扩展呈放射状;断裂试样经历过程为P-S-N曲线高应力短寿命阶段。

Abstract

The rotors of steam turbine in ultra supercritical units suffer more fatigue cycle times during operation than the required value in conventional design specification.So the design and analysis for the component fatigue life based on the conventional design specification has high risks when the fatigue cycle time the rotor suffered is higher than 108 cycles.Thus

the high-cycle fatigue experiments were carried out for25Cr2 MoVA steel

which complies with the rotors' manufacture technical specifications.Moreover

the P-SN curves were fitted based on the unlimited fatigue's semi-logarithmic model

the limited fatigue's semi-logarithmic model and the limited fatigue's semi-logarithmic bilinear model

and the fatigue fracture was analyzed.The results show that

the conditioned fatigue limits under the 108 times of cycles was 465 MPa.The analysis of the operational safety and reliability for the ultra supercritical units' rotor meet the practical requirements when the P-S-N curve was fitted based on the unlimited fatigue's semi-logarithmic model.The crack initiation came from the material surface and crack propagated radically and it was the short life stage of the P-S-N curve at high stress.

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