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Valve springs

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0048117
EISBN: 978-1-62708-235-8
... Abstract Two outer valve springs made from air-melted 6150 pretempered steel wire broke during production engine testing. The springs were 50 mm in OD and 64 mm in free length, had five coils and squared-and-ground ends, and were made of 5.5 mm diam wire. It was revealed that fracture...
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Published: 01 June 2019
Fig. 1 Valve springs made from patented and drawn high-carbon steel wire. Distorted outer spring (left) exhibited about 25% set because of proeutectoid ferrite in the microstructure and high operating temperature. Outer spring (right) is satisfactory. More
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Published: 01 January 2002
Fig. 6 Valve springs made from patented and drawn high-carbon steel wire. Distorted outer spring (left) exhibited about 25% set because of proeutectoid ferrite in the microstructure and high operating temperature. Outer spring (right) is satisfactory. More
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Published: 15 January 2021
Fig. 6 Valve springs made from patented and drawn high-carbon steel wire. Distorted outer spring (a) exhibited approximately 25% set because of proeutectoid ferrite in the microstructure and high operating temperature. Outer spring (b) is satisfactory More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001158
EISBN: 978-1-62708-225-9
... Abstract A steel valve spring meeting Steel-Iron-Test 1570 fractured during the high-stress condition of the operation of its valve. Metallographic examination of a transverse section adjacent to the fracture and a longitudinal section through the crack showed the steel was free of major...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001153
EISBN: 978-1-62708-225-9
... Abstract A valve spring made of 4.1 mm diam wire, designed to withstand 10,000,000 stress cycles, fractured after only 2,000,000 cycles. The surface displayed impressions which indicated it had been treated by shot blasting. The spring has broken in two places. Fracture 1 was a torsional...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0092131
EISBN: 978-1-62708-234-1
... Abstract The engine of an automobile lost power and compression and emitted an uneven exhaust sound after several thousand miles of operation. When the engine was dismantled, it was found that the outer spring on one of the exhaust valves was too short to function properly. The short steel...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0048124
EISBN: 978-1-62708-235-8
... Abstract Presence of transverse marks which were remnant of grinding was indicated in a failed valve spring made from ground rod. The shot-peening pattern was light at this location. A transverse crack was found to grow from one such mark under the influence of local stress fields until...
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Published: 01 January 2002
Fig. 5 Valve spring that failed due to fatigue. Fractographs of similar valve springs are shown in Fig. 6 , 7 , 8 , 9 , 10 , and 11 . 0.8× More
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Published: 01 June 2019
Fig. 1 Valve-spring failure due to residual shrinkage pipe. (a) Macrograph showing fracture, as indicated by arrow. (b) Fracture surface; pipe is indicated by arrow. More
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Published: 01 June 2019
Fig. 1 Transverse failure origin in a valve spring made from ground rod. The transverse marks (arrow) are remnants of the grinding operation. 8× More
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Published: 01 June 2019
Fig. 1 Valve spring with fractures. 1 × More
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Published: 01 June 2019
Fig. 1 H21 tool steel safety-valve spring that fractured from corrosion fatigue in moist air. (a) Photograph of two of the 12 pieces into which the spring shattered. 0.3×. (b) Light fractograph showing typical corrosion-fatigue origin (arrow) and brittle final fracture. 0.7× More
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Published: 01 January 2002
Fig. 37 Fracture surface of a hardened steel valve spring that failed in torsional fatigue. Arrow indicates fracture origin at a subsurface nonmetallic inclusion. More
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Published: 01 January 2002
Fig. 13 Valve-spring failure due to residual shrinkage pipe. (a) Macrograph showing fracture, as indicated by arrow. (b) Fracture surface; pipe is indicated by arrow. More
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Published: 01 January 2002
Fig. 3 Valve-spring failure due to residual shrinkage pipe. (a) Macrograph showing fracture as indicated by arrow. (b) Fracture surface; pipe is indicated by arrow. More
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Published: 01 January 2002
Fig. 6 Transverse failure origin in a valve spring made from ground rod. The transverse marks (arrow) are remnants of the grinding operation. 8× More
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Published: 15 January 2021
Fig. 44 Fracture surface of a hardened - steel valve spring that failed in torsional fatigue. Arrow indicates fracture origin at a subsurface nonmetallic inclusion . More
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Published: 30 August 2021
Fig. 1 Valve-spring failure due to residual shrinkage during solidification. (a) Macrograph showing fracture, as indicated by arrow. (b) Fracture surface; pipe is indicated by arrow. Source: Ref 4 More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0046874
EISBN: 978-1-62708-229-7
... Abstract The safety valve on a steam turbogenerator was set to open when the steam pressure reaches 2400 kPa (348 psi). The pressure had not exceeded 1790 kPa (260 psi) when the safety-valve spring shattered into 12 pieces. The steam temperature in the line varied from about 330 to 400 deg C...