摘要
采用含有局部效应的蠕变损伤力学方法 ,计及材料不均匀性 ,建立母材和焊缝金属两材料有限元模型 ,分析了具有缺口的 HK40带焊缝试样以及实际 HK40炉管焊接接头的蠕变损伤发展与断裂。蠕变损伤模拟结果表明 ,虽然焊缝金属为蠕变硬焊缝 ,但在服役寿命的后期 ,焊缝损伤较母材严重 ,出现损伤局部化特征 ,最终的失效发生在焊缝中。服役 10年的 HK40炉管的金相剖析也表明焊缝比母材具有较高的损伤级别 ,这预示着焊缝在长期服役过程中是最薄弱的环节之一。
WT5BZ] Among the failure cases of high temperature components, premature failures of weldments have taken a large percentage that indicates the detrimental effect of welding on structural integrity In the present paper, a local damage mechanics approach is introduced to study the damage development and creep rupture of waisted cross weld specimens and HK 40 furnace tubes due to the presence of a weld It is illustrated that although the weldment belongs to a creep hard weld, damage is prone to the weld in the later period of service life, creep dmage localization occurs, and the final failure takes place in the weld Metallographical research also indicates that the weld may have a higher damage rank It is thus concluded that the weldments may become the weak link in HK 40 furnace tubes
出处
《材料工程》
EI
CAS
CSCD
北大核心
2000年第11期9-12,共4页
Journal of Materials Engineering
