• CN:11-2187/TH
  • ISSN:0577-6686

›› 2000, Vol. 36 ›› Issue (9): 29-32.

• 论文 • 上一篇    下一篇

异种耐热钢焊接接头低塑性蠕变失效力学因素的研究

史春元;杨德新;陈字刚;田锡唐   

  1. 大连铁道学院;哈尔滨工业大学
  • 发布日期:2000-09-15

INFLUENCE OF MECHANICAL FACTOR ON LOW-DUCTILE CREEP FAILURE FOR DISSIMILAR HEAT-RESISTANT STEEL WELDED JOINTS

Shi Chunyuan;Yang Dexin;Chen Zigang;Tian Xitang   

  1. Dalian Railway Institute Harbin Institute of Technology
  • Published:2000-09-15

摘要: 用有限元法计算了异种耐热钢接头邻近焊缝界面低强度材料区的蠕变应变分布,建立了蠕变拘束区(CRZ)应力三轴度(σ(av)/σ)与蠕变应变速率的比值(εw/εb)之间的数学关系模型,并通过蠕变断裂试验证明了数学模型的正确性。理论分析和试验结果表明,焊缝界面低强度材料蠕变拘束区的应力三轴度是接头发生低塑性蠕变失效的主要力学因素。

关键词: 低塑性蠕变失效, 异种钢焊接接头, 应力三轴度

Abstract: The creep strain distribution in the low strength material adjacent to weld interface of dissimilar heat-resistant steel welded joint is investigated by finite element method, and the mathematical model between the stress triaxiality (σav/σ) and the ratio of creep strain rate (εw/εb) is established. It was shown from the analytical result that the stress triaxiality in the creep restraint zone (CRZ) of low strength material adjacent to the interface is a major mechanical factor of low-ductile creep fracture for the welded joint. The theoreticl analysis agrees with the creep fracture test results.

Key words: Dissimilar steel welded joint, Low-ductile creep failure, Stress triaxiality

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