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chemical spot testing

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0048620
EISBN: 978-1-62708-225-9
..., including the threads, and extended into the material as deep as 0.25 mm (0.010 in.). Chemical spot tests indicated that the nut had been zinc plated. Microscopic examination of the fracture surfaces of the cold-water nut indicated that considerable intergranular corrosion had also occurred at both...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001530
EISBN: 978-1-62708-225-9
... at a stress of a few MPa. The linear sliding velocity of the cast iron roller rotating against the bearing was about 1 m s −1 . Samples from both good bearings and failed bearing were collected and tested in laboratory. 4. Results 4.1 Characterization of Collected Samples Chemical analysis...
Image
Published: 01 June 2019
Fig. 11 Contamination by Acid: In this shipment from Europe, a survey prior to loading revealed seepage and a positive result for a chloride spot test. Note that these coils had been descaled. When the coils arrived in Malaysia six weeks later, there was unusually severe corrosion in the same More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.rail.c0089716
EISBN: 978-1-62708-231-0
... identified but were generally classified as semi-killed carbon steels. Investigation (visual inspection, hardness testing, chemical analysis, Charpy V-notch testing, and drop-weight testing) supported the conclusions that the fracture was initiated by weld imperfections and propagated in a brittle manner...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003529
EISBN: 978-1-62708-180-1
..., consideration of potential subsequent analyses of a surface should be considered before routinely jumping directly to SEM examination. Fig. 9 SEM image showing carbon residue buildup from the electron beam scan area in the SEM References References 1. Lessard R. , Chemical Spot Testing...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001117
EISBN: 978-1-62708-214-3
.... Chemical analysis and mechanical testing of the failed couplings showed that they had been manufactured to the API specification for Q-125, more stringent specification than P-110, and met all requirements of the application. Fractographic examination showed that the point of initiation was an embrittled...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.petrol.c9001148
EISBN: 978-1-62708-228-0
... Abstract A natural gas pipeline explosion and subsequent fire significantly altered the pipeline steel microstructure, obscuring in part the primary cause of failure, namely, coating breakdown at a local hard spot in the steel. Chemical analysis was made on pieces cut from the portion...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001298
EISBN: 978-1-62708-215-0
... by acid etching. Post-plating baking operations subsequently reduced the fatigue strength of the spar. Chemical etching Fatigue strength Mechanical properties Rotor blades 7075-T7351 UNS A97075 Pitting corrosion Fatigue fracture Surface treatment related failures Background...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001130
EISBN: 978-1-62708-214-3
... the failed seat were examined using SEM fractography, tensile and ductility tests, and spectrographic chemical analysis. The test results showed that the steel used did not meet the manufacturer's specifications for ductility (elongation). In addition, the small-diameter punched holes caused a stress...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001381
EISBN: 978-1-62708-215-0
... treatments. Fig. 1 As-received failed rotor bolt Fig. 2 Closeup view of failure area Fig. 3 Macrograph of mating fracture surfaces Testing Procedure and Results Surface Examination Optical Microstructure The bolt had been heated to obtain a tempered martensitic...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c0048795
EISBN: 978-1-62708-220-4
... suggested that during stress relief the vessel had not actually attained the specified temperature. To check this, specimens from the HAZ were accordingly heated to a variety of tempering temperatures to observe at what point softening would occur. Vickers hardness tests (1-kg load) on hard-spot specimens...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001096
EISBN: 978-1-62708-214-3
... Abstract A stud that was part of a man hole cover on an old steam boiler broke when it was dropped. The boiler was more than 100 years old, but still performed satisfactorily when fired up at regular intervals. Chemical analysis showed the steel to be a low-carbon EN2 type. Microstructural...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001124
EISBN: 978-1-62708-214-3
... to 75 mm (2 to 3 in.) on either side of the fracture. These were attributed to trimming that followed the wire joining. Fig. 1 Aluminum alloy conductor strands composed of 19 wires, with fracture and crack locations identified. All of the fractures and cracks were at the wire joints. Testing...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001754
EISBN: 978-1-62708-241-9
...″. Cage material: AMS 6415 (4340 steel), 28–35 HRC, Silver plated per AMS 2412. During the investigation, segments from each bearing component were excised for general material characterization involving hardness and chemical analysis. Hardness was tested with a microhardness tester using...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001047
EISBN: 978-1-62708-214-3
... the tube sheet to the floating skirt. Cracks penetrated deep into the tube sheet, and occasionally into the tube walls. The microstructures of both alloys and of the weld appeared normal. Intergranular corrosion characteristic of end-grain attack was apparent. A low dead spot at the skirt / tube sheet...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001029
EISBN: 978-1-62708-214-3
... load. Circumstances Leading to Failure The actuator castings were being torque tested to a torque of 365 N . m (3240 lbf . in.) during static quality control testing. Two castings failed prematurely at 180 and 200 N . m (1600 and 1800 lbf . in.), respectively. Pertinent Specifications...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001656
EISBN: 978-1-62708-219-8
... is attributable to the highly alkaline chemical environment in which the steel resides. The integrity and protective quality of the oxide film formed on reinforcing steel due to the alkaline condition may be reduced under unfavorable circumstances, in particular due to carbonation of the concrete...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0059924
EISBN: 978-1-62708-235-8
... from the inside surface. A much more severe condition was revealed after the test. The indications were classified as areas of chemical segregation and nonmetallic inclusions. The ring was considered unsatisfactory for the application and replacement of the defective ring from an acceptable billet...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001068
EISBN: 978-1-62708-214-3
... approximately 12 months earlier. The broken nozzle was repaired by welding, and hydrostatic testing was again performed. A leak in a dished end near the weld deposit was detected. Gamma radiography was performed and revealed dark spots near this region. To investigate these defects, a manhole was made...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001352
EISBN: 978-1-62708-215-0
... of the crack during operation. Proper weld heat treatment was recommended, along with avoidance of abrupt change in cross section near the weld. Due penetrant testing at the ball stem junction before and after heat treatment was also suggested. Austenitic stainless steels Chemical processing equipment...