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ASM Failure Analysis Case Histories: Improper Maintenance, Repair, and Operating Conditions最新文献

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Failure of a Nickel-Base Alloy Incinerator Liner 镍基合金焚烧炉内衬失效
ASM Failure Analysis Case Histories: Improper Maintenance, Repair, and Operating Conditions Pub Date : 2019-06-01 DOI: 10.31399/asm.fach.usage.c0091756
{"title":"Failure of a Nickel-Base Alloy Incinerator Liner","authors":"","doi":"10.31399/asm.fach.usage.c0091756","DOIUrl":"https://doi.org/10.31399/asm.fach.usage.c0091756","url":null,"abstract":"\u0000 An alloy IN-690 (N06690) incinerator liner approximately 0.8 mm (0.031 in.) thick failed after only 250 h of service burning solid waste. Investigation supported the conclusion that the root cause of the failure was overfiring during startup and sulfidation of the nickel-base alloy. No recommendations were made.","PeriodicalId":194756,"journal":{"name":"ASM Failure Analysis Case Histories: Improper Maintenance, Repair, and Operating Conditions","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123592529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Failure Analysis of Gas Turbine Engine Fuel Nozzle Heat Shields 燃气轮机燃油喷嘴防热罩失效分析
ASM Failure Analysis Case Histories: Improper Maintenance, Repair, and Operating Conditions Pub Date : 2019-06-01 DOI: 10.31399/asm.fach.usage.c9001508
S. Binard
{"title":"Failure Analysis of Gas Turbine Engine Fuel Nozzle Heat Shields","authors":"S. Binard","doi":"10.31399/asm.fach.usage.c9001508","DOIUrl":"https://doi.org/10.31399/asm.fach.usage.c9001508","url":null,"abstract":"\u0000 New type 321 corrosion-resistant steel heat shields were cracking during welding operations. A failure analysis was performed. The cause was found to be chloride induced stress-corrosion cracking. Packaging was suspected and confirmed to be the cause of the chloride contamination. A contributing factor was the length of time spent in the packaging, 21 years.","PeriodicalId":194756,"journal":{"name":"ASM Failure Analysis Case Histories: Improper Maintenance, Repair, and Operating Conditions","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131643351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Failure of High-Temperature Rotary Valve Due to Expansion and Distortion Caused by the Effects of Excessive Operating Temperature 高温旋转阀在工作温度过高的影响下发生膨胀和变形而失效
ASM Failure Analysis Case Histories: Improper Maintenance, Repair, and Operating Conditions Pub Date : 2019-06-01 DOI: 10.31399/asm.fach.usage.c0047343
{"title":"Failure of High-Temperature Rotary Valve Due to Expansion and Distortion Caused by the Effects of Excessive Operating Temperature","authors":"","doi":"10.31399/asm.fach.usage.c0047343","DOIUrl":"https://doi.org/10.31399/asm.fach.usage.c0047343","url":null,"abstract":"\u0000 An experimental high-temperature rotary valve was found stuck due to growth and distortion after approximately 100 h. Gas temperatures were suspected to have been high due to overfueled conditions. Both the rotor and housing in which it was stuck were annealed ferritic ductile iron similar to ASTM A395. Visual examination of the rotor revealed unusually heavy oxidation and thermal fatigue cracking along the edge of the gas passage. Material properties, including microstructure, composition, and hardness, of both the rotor and housing were evaluated to determine the cause of failure. The microstructure of the rotor was examined in three regions. The shaft material, the heavy section next to the gas passage and the thin edge of the rotor adjacent to the gas passage. The excessive gas temperatures were responsible for the expansion and distortion that prevented rotation of the rotor. Actual operating temperatures exceeded those intended for this application. The presence of transformation products in the brake-rotor edge indicated that the lower critical temperature had been exceeded during operation.","PeriodicalId":194756,"journal":{"name":"ASM Failure Analysis Case Histories: Improper Maintenance, Repair, and Operating Conditions","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132179289","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Failure of a Flange from a High Pressure Feeder Plant 高压给料装置法兰失效
ASM Failure Analysis Case Histories: Improper Maintenance, Repair, and Operating Conditions Pub Date : 2019-06-01 DOI: 10.31399/asm.fach.usage.c9001249
L. Kosec, F. Vodopivec, B. Wolf
{"title":"Failure of a Flange from a High Pressure Feeder Plant","authors":"L. Kosec, F. Vodopivec, B. Wolf","doi":"10.31399/asm.fach.usage.c9001249","DOIUrl":"https://doi.org/10.31399/asm.fach.usage.c9001249","url":null,"abstract":"\u0000 The flanged bearing bush carrying the drive shaft of a feed pump suddenly fractured after about two years of service. The chemical composition was normal for high chromium ledeburitic cast steel, which was corrosion and wear resistant as well as refractory. For unknown reasons the rotating shaft came into direct contact with the flange. Mechanical friction caused a rise in temperature on both contact surfaces. This mutual contact lasted long enough for the temperature in the contact zone to exceed 1200 deg C, at which the flange material became softened or molten. As a result, considerable structural changes took place on the inner wall of the flange. Thermal stresses and excessive mechanical loads due to smearing of the flange material then led to fracture of the flange.","PeriodicalId":194756,"journal":{"name":"ASM Failure Analysis Case Histories: Improper Maintenance, Repair, and Operating Conditions","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116919803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Fatigue Failure of a Metal-Sprayed Crankshaft 金属喷涂曲轴的疲劳失效
ASM Failure Analysis Case Histories: Improper Maintenance, Repair, and Operating Conditions Pub Date : 2019-06-01 DOI: 10.31399/asm.fach.usage.c9001415
{"title":"Fatigue Failure of a Metal-Sprayed Crankshaft","authors":"","doi":"10.31399/asm.fach.usage.c9001415","DOIUrl":"https://doi.org/10.31399/asm.fach.usage.c9001415","url":null,"abstract":"\u0000 In the course of a general overhaul, the crankpins and main journals (3 in. diam) of the crankshaft of a four-cylinder oil engine were built up by metal spraying. Four weeks later, the shaft broke through the pin remote from the flywheel (driving) end. The fracture was of the fatigue type. A creeping crack originated in the fillet at the inside surface of the pin and extended parallel to the plane of the web across practically the entire section before complete rupture occurred. The sprayed metal on the fractured pin had very poor adhesion. The surfaces of the main journals had not been grooved but appeared to have been roughened by shot or grit-blasting prior to spraying and the deposit was more firmly adherent to these surfaces than in the case of the pins. It is doubtful, however, whether the adhesion of sprayed metal to a surface prepared even in this manner would always be satisfactory under severe loading conditions, such as those to which a crankpin is subjected in service.","PeriodicalId":194756,"journal":{"name":"ASM Failure Analysis Case Histories: Improper Maintenance, Repair, and Operating Conditions","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126906794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Ultrasonic Inspection of an Upset-Forged 4118 Steel Shaft 镦锻4118钢轴的超声检测
ASM Failure Analysis Case Histories: Improper Maintenance, Repair, and Operating Conditions Pub Date : 2019-06-01 DOI: 10.31399/asm.fach.usage.c0059932
{"title":"Ultrasonic Inspection of an Upset-Forged 4118 Steel Shaft","authors":"","doi":"10.31399/asm.fach.usage.c0059932","DOIUrl":"https://doi.org/10.31399/asm.fach.usage.c0059932","url":null,"abstract":"\u0000 Field failures, traced to internal cracks that were initiated from gross nonmetallics, were encountered in the upset portion of forged 4118 steel shafts. Ultrasonic inspection was thought to be the best method for detection from the location of these cracks, their orientation, and the size of the shaft. A longitudinal beam was sent in from the end of the shaft. The shaft was observed to have a radially drilled oil hole 9 mm in diam. Since there was a variation in flaw orientation, testing of the shaft was desired from both the long and short end. The rejection level was set at 20% of full screen and was based on the size of flaws observed when the shafts were cut up. The inclusions were considered to be rejectable if the size was larger than 20 mm diam. Similar flaws were observed in larger shafts, but no flaws were observed once the shafts were sectioned. It was interpreted that the flaw signals were false and had happened when a portion of the beam struck the oily surface of the longitudinal oil hole. The problem was solved by removing the oil film from the longitudinal oil hole.","PeriodicalId":194756,"journal":{"name":"ASM Failure Analysis Case Histories: Improper Maintenance, Repair, and Operating Conditions","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115154522","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Failure of a Press 印刷机的失败
ASM Failure Analysis Case Histories: Improper Maintenance, Repair, and Operating Conditions Pub Date : 2019-06-01 DOI: 10.31399/asm.fach.usage.c9001016
C. Craft
{"title":"Failure of a Press","authors":"C. Craft","doi":"10.31399/asm.fach.usage.c9001016","DOIUrl":"https://doi.org/10.31399/asm.fach.usage.c9001016","url":null,"abstract":"\u0000 An automatic press for making burlap bags had been used for several years. The press failed after being shipped by truck for a distance of about 400 mi. The objective was to determine whether failure occurred during or before shipment. The large piece which broke off the press included a section of the ways and a heavy adjustable mechanism which normally rides on these ways. The weight of the broken section was estimated at several hundred pounds. There was no support for the broken piece beyond the point of breakage. The material was a commercial cast iron, and the largest proportion of the fracture area was fresh and bright. It was concluded that this was a fresh fracture which occurred during shipment, and the crack itself was not present prior to shipment. The fact that a material defect of some sort was present and probably determined the location of the crack was apparently not significant as far as its usage was concerned. The failure could have been avoided by providing support underneath the overhanging member.","PeriodicalId":194756,"journal":{"name":"ASM Failure Analysis Case Histories: Improper Maintenance, Repair, and Operating Conditions","volume":"108 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113945631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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