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首页> 外文会议>ASME Pressure Vessels and Piping conference >ROLE OF LONG TERM AGEING ON THE CREEP LIFE OF TYPE 316H AUSTENITIC STAINLESS STEEL BIFURCATION WELDMENTS
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ROLE OF LONG TERM AGEING ON THE CREEP LIFE OF TYPE 316H AUSTENITIC STAINLESS STEEL BIFURCATION WELDMENTS

机译：长期老化对316H型奥氏体不锈钢分叉焊缝的蠕变寿命的作用

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摘要

Intergranular creep cracks have been observed in the heat affected zone of the 316H austenitic stainless steel superheater boiler tube bifurcation weldments after long term service at temperature of ～550°C. The cracking mechanism is believed to be creep dominated. Moreover, chemical composition of defective material compared with similar uncracked components suggests that composition influences susceptibility to creep cracking. A systematic characterization of ratios number of creep cavities/grain boundary length and inter-granular precipitation length/grain boundary length has been undertaken in HAZ of three samples extracted from plants with different specific compositions. Here, the role of precipitation on creep deformation and fracture is explored. Precipitates of both ferrite and M_(23)C_6 carbide arising from long term service and associated creep cavitation have been identified using transmission electron microscopy. The creep damage and cracking, and therefore overall service life creep, is discussed by consideration of susceptibility of creep cavity nucleation and subsequently growth arising from specific differences in the chemical composition of the three boiler tube bifurcations.
机译：在〜550°C的温度下长期使用后，在316H奥氏体不锈钢过热器锅炉管分叉焊件的热影响区中观察到晶间蠕变裂纹。据信裂纹机理是蠕变为主的。此外，与类似的未开裂部件相比，缺陷材料的化学成分表明该成分会影响蠕变开裂的敏感性。在热影响区中，从具有不同特定组成的植物中提取的三个样品中，对蠕变腔数/晶粒边界长度与颗粒间沉淀长度/晶粒边界长度之比的数量进行了系统表征。在这里，探讨了降水对蠕变变形和断裂的作用。使用透射电子显微镜已确定了长期使用和相关的蠕变空化引起的铁素体和M_（23）C_6碳化物的沉淀。通过考虑蠕变腔形核的敏感性以及随后由于三个锅炉管分叉的化学成分的特定差异而引起的增长，来讨论蠕变损伤和裂纹，进而讨论整个使用寿命的蠕变。

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