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OALib Journal期刊
ISSN: 2333-9721
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P92钢焊接接头IV型蠕变断裂特性
DOI: 10.3724/SP.J.1037.2011.00646, PP. 427-434
Keywords: 超超临界机组,P92钢,蠕变,IV型断裂,显微组织,孔洞
Abstract:
在600-650℃,100-240MPa对用埋弧自动焊工艺制备的P92钢焊接接头进行高温蠕变实验,采用OM,SEM和TEM等研究焊接接头的IV型蠕变断裂特性.结果表明,P92钢焊接接头的IV型断裂发生在高温和低应力条件下,存在一个临界Larson--Miller参数LMP和临界应力,它们的值分别约为35.5和120MPa;IV型断裂部位的变形很小,位于靠近临界热影响区的细晶区,即加热峰值温度在AC3附近,该部位显微结构退化为铁素体等轴晶及蠕变过程中Laves相在晶界析出和长大是影响IV型断裂的主要因素,M23C6粗化的影响较小;焊接接头IV型断裂是一种晶界孔洞聚集型蠕变断裂,孔洞在粗大Laves相附近形核,可用损伤晶界上孔洞面积分数f或孔洞面积分数a作为发生IV型断裂的微观判据,它们在650℃时的临界值分别约为0.5%和1.2%.
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