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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0051292
EISBN: 978-1-62708-225-9
... Abstract Type 302 stainless steel springs used in a printing operation failed by breaking into several pieces after two months in service. The springs were operating over a very small deflection and were regulating the flow of ink, in which they were constantly immersed. Fatigue fractures...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0051293
EISBN: 978-1-62708-225-9
... Abstract Majority of the water feeders in a new chicken house had stopped working. The water feeders were found to be operated on the principle that when the chickens pecked a plastic bowl, a compressed spring released a squirt of water. The small compression springs were made from type 302...
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Published: 01 June 2019
Fig. 1 Micrograph showing the equiaxed grains of the Type 302 stainless steel used in the failed retaining band. This grain structure is typical of the annealed condition. (400× magnification) More
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Published: 01 December 1992
Fig. 9 Fatigue curves for notched and unnotched type 302 austenitic steel in the annealed condition. No notch sensitivity is apparent. Source:Adapted from Ref 4 . More
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Published: 01 June 2019
Fig. 4 Middle Right — Tool mark found on end hook of failed type 302 spring. More
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Published: 30 August 2021
Fig. 25 Field failure of burner fan impeller due to sensitizing of type 302 austenitic stainless steel near weld zone More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c0048052
EISBN: 978-1-62708-224-2
... occurred in links having hardness values in the range of 375 to 444 HRB. It was revealed by the supplier that the previous hardness level of 302 to 375 HRB was increased to minimize wear which made the links were made notch sensitive and resulted in fractures that initiated at the butt-weld flash...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001905
EISBN: 978-1-62708-217-4
... Abstract A bomb retaining ring fabricated from type 302 stainless steel unwrapped during a practice flight, causing the bomb fins to deploy. The retaining ring was able to unwrap itself because it was thinner and softer than required. Hardness testing, metallography, and tensile testing...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c0048077
EISBN: 978-1-62708-221-1
... and tempered to a hardness of 302 to 352 HRB and all machining discontinuities were removed. Brinell hardness Fatigue strength Magnetic particle testing Radii 1040 UNS G10400 Fatigue fracture The 14-cm (5 1 2 -in.) diam main hoist shaft of a mobile shovel was found to have multiple...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c0048082
EISBN: 978-1-62708-221-1
... Abstract The horizontal cross-travel shaft on a derrick failed after two years of service. The shaft was required to be made of 4140 steel quenched to a hardness of 302 to 352 HRB. The shaft was found to have fractured approximately 13 mm from the change in section between the splined end...
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.c9001547
EISBN: 978-1-62708-225-9
... Abstract Life testing of cyclic loaded, miniature extension springs made of 17-7 PH stainless steel wire and AISI 302 Condition B stainless steel wire has shown end hook configuration to be a major source of weakness. To avoid cracking and subsequent fatigue failure, it was found that stress...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c0047406
EISBN: 978-1-62708-232-7
... of the tooth surfaces. Contributing factors included uneven loading because of misalignment and stress concentrations in the tooth roots caused by tool marks. Greater strength was provided by oil quenching and tempering the replacement pinions to a hardness of 255 to 302 HRB. Machining of the tooth roots...
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Published: 01 June 2019
Fig. 5 Right — Surface roughness associated with origin of fatigue crack failure of some type 302 springs. More
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Published: 01 June 2019
Fig. 3 Middle Left — Typical appearance of fracture surface of end hooks of cyclic loaded miniature extension springs made from 0.01 in. (0.25 mm) diameter type 302 wire. More
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Published: 01 June 2019
Fig. 4 Plot of contact temperature versus pinion roll angle for gear tooth geometry that was optimized for maximum scuffing resistance. Maximum T f, 150 °C (302 °F); scuffing probability, <5% More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0009190
EISBN: 978-1-62708-225-9
... of wear is reduced to 94%. Figure 4 shows that the optimized gear geometry reduced the maximum contact temperature to a T c of 150 °C (302 °F). The combination of reduced contact temperature and the increased scuffing resistance provided by the higher viscosity mineral oil with antiscuff additives...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001118
EISBN: 978-1-62708-214-3
... power unit and a pump in a commercial aircraft secondary unit, which began leaking oil heavily. Removal and inspection of the seals showed that the internal springs had fractured. Pertinent Specifications The springs were made from AISI type 302 stainless steel, work hardened by drawing to 2140...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0046247
EISBN: 978-1-62708-235-8
... steel within the ranges given in ASTM A 186. Hardness of the tread was 302 HB and of the web was 255 HB. Visual examination of the broken wheel revealed that cracking had extended circumferentially around the web before complete failure occurred ( Fig. 1a ). The cracks ran parallel with the base...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006836
EISBN: 978-1-62708-329-4
... were made from AISI type 302 stainless steel, work hardened by drawing to 2140 to 2240 MPa (310 to 325 ksi). The two ends of a single length of spring were wound together to make a loop used in the lip seal. Therefore, mating fracture faces were located on opposite ends of each broken spring ( Fig. 5...