安全分析第35卷第9期 超超临界机组锅炉用12Cr1MaV合金 连接板处失效分析 武东森杨喜山2武东杰2 (1.华能沁北发电有限责任公司济源45400 (2.河南济源万洋冶炼集团有限公司济源454000 摘要:针对某1000wW超超临界锅炉运行约3600后,高温再热器再入口段管排与固定连接板处焊缝 拉裂泄漏失效情况进行分析。利用SM及金相检验观察分析了12CM合金高温断口失效形式。分析结果表明 原始及长周期运行后微观组织均为F+P+B,组织形貌完全相同老化程度不明显。电鏡扫描断口呈现为明显的 韧窝形貌塑性断裂,裂纹是在较大应力下扩展,段管排与固定连接板焊缝区堿拉裂、撕伤管子的现象,在 行过程中连接板处膨胀受阻导致拘柬应力过大焊缝拉裂。从分析管排膨胀杌理、释放拘柬应力、更换受损等 几个方面提出了预防、减少锅炉高温受热面管排拘柬应力的措施 关键词:超超临界机高温受热面拘柬应力膨胀断裂 Failure Analysis of 12Cr1MoV Alloy Connecting Plate for a-supercritical Unit boiler /u Dongsen Yang Xishan Wu Dongji (. Huaneng Qinbei Power Plant Jiyuan 454000) (2. Henan Jiyuan Wanyang Smelting Group Co, Ltd, Jiyuan 454000) Abstract After a certain 1000MW ultra-supercritical boiler has been in operation for about 36,000h, the failure of the weld crack at the inlet and outlet of the high-temperature reheater is analyzed. The failure modes of 12CrI MoV alloy high temperature fracture were analyzed by SEM and metallographic examination, The analysis results show that the microstructures of the original and long-period operations are F+P+B, and the morphological characteristics are not obvious. The SEM scanning fracture appears as a plastic fracture of the dimple shape. The crack is extended under large stress, and the weld zone of the section pipe and the fixed joint plate is cracked and the pipe is torn. The joint plate expands during the operation. Obstruction causes the restraint stress to be excessively cracked From the aspects of analyzing tube expansion mechanism, releasing restraint stress, replacing damage, etc, measures to prevent and reduce the restraint stress of boiler high temperature heating surface tube are proposed. Keywords High temperature heating surface Restraint stress Expansion 中图分类号:X933.2 文献标识码 文章编号:1673-257X(2019)09-0065-04 DOI:10.3969j.issn.1673-257X.2019.09.012 超临界锅炉的膨胀与锅炉运行工况、几何形状 流场温度分布、锅炉安装、受热面结构等多种因素有关 作者简介:武东森(1988~),男,硕士,工程师、从事锅许多电力企业在过热器、再热器等穿顶棚管处,梳形 炉四管泄露预防及治理工作 通讯作者:武东森,E-mal:wds648927589@163.cm 板密封焊缝多次发生过泄漏事件,因结构原因,在此 (收稿日期:2019-04-23 处无法使用射线、磁粉和超声检测方法,严重影响机 m|65