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清华大学学报(自然科学版)  2015, Vol. 55 Issue (10): 1056-1060,1066    DOI: 10.16511/j.cnki.qhdxxb.2015.22.003
  机械工程 本期目录 | 过刊浏览 | 高级检索 |
焊接接头低周疲劳性能薄弱区转移
李轶非1, 蔡志鹏1, 汤之南1, 潘际銮1, 刘霞1,2, 孙林根2
1. 清华大学 机械工程系, 北京 100084;
2. 上海电气电站设备有限公司 上海汽轮机厂, 上海 200240
Weak zone shift in welded joints for low cycle fatigue
LI Yifei1, CAI Zhipeng1, TANG Zhinan1, PAN Jiluan1, LIU Xia1,2, SUN Lingen2
1. Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China;
2. Process Department of Turbine Works, Shanghai Electric Power Generation Equipment Co., Ltd., Shanghai 200240, China
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摘要 研究汽轮机焊接转子接头低周疲劳性能薄弱区对转子的安全运行具有重要意义。该文测试了汽轮机低压焊接转子用25Cr2Ni2MoV耐热钢焊接接头低周疲劳性能, 统计分析焊接接头低周疲劳性能薄弱区与应变幅之间的关系, 采用显微硬度测试和有限元模拟分析薄弱区转移原因。结果表明: 低周疲劳试验中宏观裂纹出现于焊缝和热影响区的回火区, 当外加应变载荷由大变小时, 焊接接头低周疲劳性能薄弱区由焊缝中心区域转移至热影响区的回火区。在大应变外加载荷条件下, 热影响区的回火区塑性变形受较大约束, 焊接接头整体的塑性应变向焊缝区转移; 在小应变外加载荷条件下, 焊缝区域始终处于弹性状态, 热影响区的回火区大硬度梯度的软硬夹层结构加剧了应变集中程度。
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李轶非
蔡志鹏
汤之南
潘际銮
刘霞
孙林根
关键词 焊接转子低周疲劳NiCrMoV钢薄弱区转移应变集中    
Abstract:Weak zones in welded joints due to low cycle fatigue can affect the safety of welded steam turbine rotors. This study analyzes the low cycle fatigue strength of welded 25Cr2Ni2MoV refractory steel steam turbine rotor joints. The strains in the weak zones of the welded joints are modeled statistically. The reason for the weak zone shift is studied using hardness tests and finite element analyses. The experimental results show that cracks develop in the weld and in tempered regions of the heat affected zone. The weak zone shifts from the weld to tempered regions with decreasing strain. With large strains, the plastic strain concentrates in the weld while with low strains, the weld stays in the elastic range. The large hardness gradient in the tempered region with sandwich construction increases the strain concentration.
Key wordswelded rotor    low cycle fatigue    NiCrMoV refractory steel    weak zone shift    strain concentration
收稿日期: 2014-12-26      出版日期: 2015-11-16
ZTFLH:  TG407  
基金资助:上海市科学技术委员会科研计划项目(13DZ1101500)
通讯作者: 蔡志鹏,副研究员,E-mail:czpdme@tsinghua.edu.cn     E-mail: czpdme@tsinghua.edu.cn
作者简介: 李轶非(1989-),男(汉),河北,博士研究生。
引用本文:   
李轶非, 蔡志鹏, 汤之南, 潘际銮, 刘霞, 孙林根. 焊接接头低周疲劳性能薄弱区转移[J]. 清华大学学报(自然科学版), 2015, 55(10): 1056-1060,1066.
LI Yifei, CAI Zhipeng, TANG Zhinan, PAN Jiluan, LIU Xia, SUN Lingen. Weak zone shift in welded joints for low cycle fatigue. Journal of Tsinghua University(Science and Technology), 2015, 55(10): 1056-1060,1066.
链接本文:  
http://jst.tsinghuajournals.com/CN/10.16511/j.cnki.qhdxxb.2015.22.003  或          http://jst.tsinghuajournals.com/CN/Y2015/V55/I10/1056
  表1 25Cr2Ni2MoV 钢各化学成分的质量分数
  表2 焊接工艺参数
  图1 轴向等幅低循环疲劳试样实物图
  图2 应力应变迟滞回线
  图3 低周疲劳应变幅与疲劳失效反向数的关系
  图4 低周疲劳试验失效位置与塑性应变幅疲劳失效反向数曲线试验点的对应关系
  图5 NiCrMoV 钢焊接接头硬度分布
  表3 焊接接头区域硬度与屈服强度
  图6 焊接接头模型
  图7 大应变幅加载条件下焊接接头各区塑性应变大小分布
  图8 小应变幅加载条件下焊接接头各区塑性应变大小分布
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