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高温过热器T91/TP347H异种钢焊接接头断裂失效分析 被引量:6
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作者 刘俊建 《理化检验(物理分册)》 CAS 2018年第1期67-70,共4页
某电厂超临界火电锅炉的高温过热器管在服役约4×10~4 h后,T91/TP347H异种钢焊接接头T91钢管侧出现环向断裂事故。通过宏观检查、结构分析、化学成分分析、金相检验及硬度测试等方法,对该焊接接头断裂失效的原因进行了分析。结果表... 某电厂超临界火电锅炉的高温过热器管在服役约4×10~4 h后,T91/TP347H异种钢焊接接头T91钢管侧出现环向断裂事故。通过宏观检查、结构分析、化学成分分析、金相检验及硬度测试等方法,对该焊接接头断裂失效的原因进行了分析。结果表明:焊接接头的T91钢管侧内壁车削后的厚度小于钢管的最小需要壁厚,该处钢管过量车削后的结构造成的工质流动变化引起了局部超温,材料加速老化,钢管强度下降;T91钢管侧热影响区由于强度不足而发生胀粗,产生蠕变裂纹,裂纹在轴向应力的作用下不断扩展,最终引起钢管环向断裂。 展开更多
关键词 异种钢 焊接接头 环向断裂 过量车削 热胀应力
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昌里水库输水洞裂缝成因浅析及处理
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作者 高洪光 孙明青 +1 位作者 蒋传华 翟桂虎 《山东水利》 2001年第3期44-45,共2页
1基本情况 昌里水库位于平邑县张里乡昌里村南,沂河水系浚河支流西皋河上,水库下游有岚兖公路和兖石铁路.水库控制面积160.75km2,总库容7060万m3,是一座以防洪、灌溉为主的中型水库.
关键词 水库 输水洞 裂缝 环向断裂 成因
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An Analysis on the Transmission Shaft Fracture of Screw Drill
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作者 Bin LUO Gaofei LIU Jian DU 《International Journal of Technology Management》 2015年第10期109-112,共4页
The transmission shaft of the underground screw drill fractured when milling-shoe and grinding bridge plug was applied to the coiled tubes in a horizontal well of Sichuan province, but the position of this transmissio... The transmission shaft of the underground screw drill fractured when milling-shoe and grinding bridge plug was applied to the coiled tubes in a horizontal well of Sichuan province, but the position of this transmission shaft fracture did not occur at the minor-diameter retracting position and reducing position that were easy to fracture. An analysis of the transverse planes of the fracture found that the cause of the transmission shaft fracture surface was that the defects of the initial surface were propagating to cracks and gave rise to the fracture under torque load. To specifically know well the strength of the transmission shaft under damaging fracture, a statics analysis was conducted on the transmission shaft through ANSYS finite element simulation software, and the finite element models under no cracks, different-depth circumferential cracks, and similar situation of the transverse planes of fracture were established respectively. An analysis of the crack-free finite element model found that the fracture of the transmission shaft was really not caused by the self-structure of the transmission shaft; an analysis of circumferential crack finite element model found that strong stress concentration would appear in the tip of cracks, and the value of the stress would increase along with the increase of the circumferential crack depth, the stress of the entire crack top tended to fluctuate like waves, and also the strength of the transmission shaft was greatly impacted by the presence of cracks; an analysis of the similar crack finite element model found that stress concentration would appear in the tip of cracks, and the initial cracks always started to propagate from the tip of the external surface of the transmission shaft and would propagate inward until the propagating areas of two cracks overlapped, and finally reached the position of transient interruption, and then the transmission shaft fractured completely and the fracture strength was onlv 1/5 of that under no cracks. 展开更多
关键词 Screw Drill Transmission Shaft Fracture Analysis CRACK ANSYS
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