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Field Metallography

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001661
EISBN: 978-1-62708-229-7
... Abstract An evaluation of indications in the main turbine building column horizontal plate welds was conducted by the joint efforts of field metallography and nondestructive examinations. The turbine building main column horizontal plate welds were selected at random and were inspected to find...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001666
EISBN: 978-1-62708-229-7
... related to chloride or sulphate ion steam contaminants. Subsequent sectioning and conventional metallography confirmed both the validity of the conclusions and the replication techniques. Corrosion products Field metallography Intergranular corrosion Turbine discs 2.5Ni-Cr-Mo-V Stress-corrosion...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001059
EISBN: 978-1-62708-214-3
... Abstract Field metallography and replication were performed on a type 316 stainless steel column in diglycol amine vacuum service to determine the cause of visible OD pitting on the column in several areas above the insulation support rings. The examination revealed transgranular stress...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001039
EISBN: 978-1-62708-214-3
... Abstract The 4140 steel steering spindle on a tricycle agricultural field chemical applicator failed, causing the loss of the front wheel and overturn of the vehicle. The spindle was a solid 120 mm (4.75 in.) diam forging. It had been machined to 115 mm (4.5 in.) in diameter to fit tightly...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006758
EISBN: 978-1-62708-295-2
... representative calibration standards, or difficulties with field inspections. During a failure analysis there is no predetermined NDE method as there is during manufacturing part acceptance. It is important for the failure analyst to communicate with the NDE practitioner to determine to what degree the NDE...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001041
EISBN: 978-1-62708-214-3
... fillet weld. On sample 9, which was tested at a significantly higher number of cycles, cracking was evident along both of the fillet weld toes, as well as through the torque rod mounting holes ( Fig. 4 ). The field-returned failures were cracked at the same locations as sample 9. It was significant that...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006763
EISBN: 978-1-62708-295-2
... analysis process is image based, the accurate recording of the fracture feature information is essential. In addition, the photographic image record transcends field documentation, laboratory documentation, microscopic documentation, scanning electron microscopic documentation, optical metallography...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0048850
EISBN: 978-1-62708-229-7
... chloride contents. The material was basic and had sufficiently low leachable impurities that intergranular stress-assisted corrosion was eliminated as a cause of failure. Field metallographic techniques were developed, using a repeated polish-and-etch technique, to examine the remainder of the piping. A...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006756
EISBN: 978-1-62708-295-2
... including nondestructive evaluation techniques such as penetrant testing, boroscopic examination, ultrasonic testing, and radiography as well as field metallography including replication and sample removal can identify if characteristics associated with damage are present. (These techniques are discussed in...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001536
EISBN: 978-1-62708-229-7
... fixed. Loose contamination is that which can be readily transferred to a cloth or other material wiped across the surface of the contaminated component, whereas fixed contamination cannot be readily removed in this manner. Fixed contamination generally produces most of the radiation field, and therefore...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001116
EISBN: 978-1-62708-214-3
... suggested that chemical segregation contributed to the hard areas. Postweld normalized heat treatment apparently did not sufficiently reduce the hardness of these areas. Oil field equipment, corrosion Pipe, corrosion Sour gas, environment Sulfide stress cracking Sulfides, environment Welded...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001561
EISBN: 978-1-62708-229-7
... cracked-field weld), and SF 261 (uncracked-shop weld), as well as three uncracked longitudinal seam shop welds ( Figure 1 ). (Note: Six of the seven through wall cracks were from material of this heat number 334165.) Fig. 1 Location of welds and crack on 30 1 4 ″ piece of 8″ stainless steel...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006754
EISBN: 978-1-62708-295-2
... response to disastrous failures. It is also being used by medical administrators and many other fields. Commercial software tools These exist for a variety of functions, including tracking the course of an investigation and suggesting a course of action for the background data collection. In...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001695
EISBN: 978-1-62708-229-7
... and aggressive impurity concentrations, is believed to be primarily responsible for the improvement in fuel storage performance between 1994–1996. We have seen no new pitting initiation in these basins since the water conductivity has been below about 125 µS/cm. This field observation is supported by...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001084
EISBN: 978-1-62708-214-3
... observed farther away from the fracture initiation site and out of the field of view of Fig. 3(b) . Fig. 3 SEM micrographs of surface defects on sample SEM 1. (a) Over view of defect that intersects surface A. The dendritic structure is typical of shrinkage porosity. Note tear Edges and beach marks...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001030
EISBN: 978-1-62708-214-3
... the cracks probably propagated by SCC. The presence of a sustained residual stress field in the D6ac steel frame, caused by the application of interference-fit fasteners while in the presence of moisture, produces the necessary conditions for SCC. Many other factors were present, each of which had a...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006762
EISBN: 978-1-62708-295-2
... acceptable and whether there is a distribution list for the report or it restricted to the requestor. Also, for instances of unique or noteworthy failures that might generate interest in the failure analysis or another specific technical field, it must be determined whether the information can be shared or...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001609
EISBN: 978-1-62708-229-7
... modules were assembled in the field, three across and five deep in the direction of gas flow. The last modules contained the feedwater economizer that included one in-line alloy 430 harp assembly in each of the three-abreast modules. These harps were positioned immediately before the exhaust stack. Each...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006765
EISBN: 978-1-62708-295-2
... only recourse in the field. If this is done, the torch-cut area must be well away from the area to be examined, because the heat from this operation severely alters the original microstructure for some distance from the cut. Subsequent cutting can be performed with laboratory devices that are much less...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006764
EISBN: 978-1-62708-295-2
... discontinuities in the translucent material and any variations in material thickness. Magnetic-particle inspection (MPI) uses magnetic fields to locate surface and subsurface discontinuities in ferromagnetic materials. When the material or part to be tested is magnetized, discontinuities that generally...