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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0090463
EISBN: 978-1-62708-234-1
...Abstract Abstract A housing used in conjunction with an electrical switch failed shortly after being placed into service. A relatively high failure rate had been encountered, corresponding to a recent production lot of the housings, and the failed part was representative of the problem...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0048139
EISBN: 978-1-62708-225-9
... Abstract The conical helical spring sealed, within each switch enclosure, fractured to lead to the failure of several electrical toggle switches. The spring was fabricated from 0.43 mm diam AISI type 302 stainless steel wires. Appreciable amount of scale was observed on the fracture surface...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0048120
EISBN: 978-1-62708-225-9
... Abstract The pawl spring which was part of a selector switch used in telephone equipment failed. The springs were blanked from 0.4 mm (0.014 in.) thick tempered 1095 steel and then nickel plated. Numerous pits around the rivet holes were revealed by microscopic examination of longitudinal...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001243
EISBN: 978-1-62708-225-9
... lubrication. The machine manufacturer therefore switched to bearings with shells of a complex bronze. Bearing steel Cracking (fracturing) Food packaging Needle bearings Ball bearing steel Corrosion fatigue Pitting corrosion A needle bearing from a filling- and seating machine for milk cartons...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001484
EISBN: 978-1-62708-229-7
... material. (×150). Fig. 6 Microstructure at “x” in Figure 2 . (×150). Fig. 3 Microstructure adjacent to rubbed surface. (×150). Abstract Abstract Fusing of the switch contacts of a boiler feed pump drive motor led to the failure of a turbine. After rubbing of most of the Ni-Cr...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001521
EISBN: 978-1-62708-229-7
...-corrosion cracking. The main corrosion product was cupric hydroxychloride. In addition to switching to a more corrosion-resistant alloy, extreme care should be taken in the manufacturing of the replacement tube bundles to avoid imparting any residual tensile stresses in the tubing. Analyses of city...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001642
EISBN: 978-1-62708-235-8
... Abstract A plant had manufactured and heat treated their product in house for years. As time went on, the special steel that they had been using became more expensive, and a switch was made to a more common and less highly alloyed material. However, no change in hardness specifications were...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001786
EISBN: 978-1-62708-241-9
... Nomenclature of variables i. First Case—Without Reversing the Spindle ii. Second Case—With Sudden Reversing of the Spindle Case 1 Case 2 Modification in the control circuit by providing a timer device between forward and reverse switch. Practicing safe operating procedure of lathe...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001813
EISBN: 978-1-62708-180-1
.... Because both failures were similar, the analysis of only one will be discussed. The pawl spring shown in Fig. 4(a) was part of a selector switch used in telephone equipment. Three of these springs that broke and strip specimens of the raw material used to fabricate similar springs were...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0006424
EISBN: 978-1-62708-217-4
... air at 448 kPa (65 psig) shifts the dual-position valve (part B, Fig. 1b ). Fig. 1 Overall view (a) of external tank pressure/vent valve. (b) Partially disassembled valve. A, solenoid switch; B, dual-position valve; C, valve housing. (c) Segment of air line showing residue on check valve...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001547
EISBN: 978-1-62708-225-9
... UNS S45500 Fatigue fracture Stress-corrosion cracking Mechanical springs go into a variety of aerospace systems where both efficiency and reliability are required. Typical applications range from the control of switching characteristics of miniature switches to the deployment of missile fairing...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c0046505
EISBN: 978-1-62708-219-8
...). During a fire emergency, heat detectors activated a switch, releasing a weight that pivoted the lip of the latch away from the clapper. Water pressure forced the clapper plate upward. allowing water to flow through the system. Selected Reference • Forms of Corrosion , Failure Analysis...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001273
EISBN: 978-1-62708-215-0
...-nickel alloys such as these have a good resistance to general corrosion and stress-corrosion cracking. Switching to a nonmetallic material might also solve the problem. While the above-mentioned materials would resist stress-corrosion cracking much better than a 300-series stainless steel, issues...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001721
EISBN: 978-1-62708-225-9
.... The valves employ a soft iron gasket between the bonnet and the main body. The gasket is a fire proof refinery gasket and requires a large clamping force to ensure proper compression and sealing. It was noted that in 1988 the valve manufacturer switched the material for the bonnet screws from SAE grade 8...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c0065826
EISBN: 978-1-62708-233-4
... the fractured wire face inside the ferrule Seven days after the more expensive type 304 wires were installed, the first failed. Thus, switching from inexpensive 1008 carbon steel wire to a much more expensive type 304 austenitic stainless steel wire changed the time to first failure from one year to one...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001641
EISBN: 978-1-62708-235-8
... development issues are apparent from the porosity analysis. First of all, defining a task to simply categorize observations generally restricts thinking and minimizes the input from those involved in the categorization. This type of black and white thinking has a place: “A light switch is either on or off...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003566
EISBN: 978-1-62708-180-1
... in the cylinder is released, the tool is pivoted upward in the grip assembly until an electrical trigger switch is engaged. Air pressure then is put into the cylinder as the driving force for the test, and the striking tool is pivoted downward onto the anvil, which is held rigidly in a fixture. A digital counter...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001348
EISBN: 978-1-62708-215-0
... microscope (SEM); typical micrographs are shown in Fig. 2 . The fracture path near the fusion line was transgranular ( Fig. 2 ), then changed to intergranular in the HAZ ( Fig. 2 ), and switched back to the transgranular mode in the unaffected base metal ( Fig. 2 ). The regions that had been fractured...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c9001714
EISBN: 978-1-62708-232-7
... and 35 % of Cr. The metal dusting attack can be easily seen by x-ray radiography method. The inspections were carried out after the plant was switched off and the radiation heat exchanger box temperature cooled down to room temperature. Formerly, the metal dusting attacked the inner surface of D and C...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0009222
EISBN: 978-1-62708-180-1
.... A switch to an air-hardening steel or differential hardening could have eliminated the difficulty. Fig. 4 A properly heat treated tool of manganese oil-hardening steel has a martensitic structure (left) containing fine tempered martensite and carbides. An overheated tool material has an acicular...