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4340 low-alloy steel

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0049797
EISBN: 978-1-62708-235-8
... Abstract An AISI 4340 threaded steel connecting rod that was part of a connecting linkage used between a parachute and an instrumented drop test assembly fractured under high dynamic loading when the assembly was dropped from an airplane. A large flaw that originated from the root of a machined...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0046870
EISBN: 978-1-62708-217-4
... Abstract A hollow, splined alloy steel aircraft shaft (machined from an AMS 6415 steel forging – approximately the same composition as 4340 steel – then quenched and tempered to a hardness of 44.5 to 49 HRC) cracked in service after more than 10,000 h of flight time. The inner surface of the...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001145
EISBN: 978-1-62708-217-4
.... The darker bands are heavily tempered martensite. The observed alloy segregation must have been present in the manufactured part. Microhardness measurements vary from as low as 350 KHN (35 HRC) in the dark areas to as high as 690 KHN (58 HRC) in the light areas. Fig. 19 Overheating of the Steel...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001752
EISBN: 978-1-62708-241-9
... Abstract Results of failure analyses of two aircraft crankshafts are described. These crankshafts were forged from AMS 6414 (similar composition to AISI 4340) vacuum arc remelted steels with sulfur contents of 0.003% (low sulfur) and 0.0005% (ultra-low sulfur). A grain boundary sulfide...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001619
EISBN: 978-1-62708-225-9
... approximately 140 mm (5.5 in.) in the unsplined section and was made of 4340 Ni-Cr-Mo alloy steel heat treated to a uniform hardness of HRC 31. Cracks from at least seven different origins had coalesced to produce the single large crack that resulted in failure. The origins of these cracks were on the flanks of...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001620
EISBN: 978-1-62708-229-7
... Abstract Two vertical coal-pulverizer shafts at a coal-fired generation station failed after four to five years in service. One shaft was completely broken, and the other was unbroken but cracked at both ends. shaft material was AISI type 4340 Ni-Cr- Mo alloy steel, with a uniform hardness of...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001299
EISBN: 978-1-62708-215-0
... zone of a fatigue crack. 1.11× The crankshaft was manufactured from SAE 4340 steel. Similar crankshafts were reported to have completed their predicted service life satisfactorily. The undamaged portion of the crankshaft was selected for detailed fracture analysis under a low-power...
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
... variety of steels and followed their performance over a period of time. The steels tested included plain carbon and low-alloy steels, and the hardness of each hammer complied with the hardness limits required by BS 876 (520 to 640 HV; 50.5 to 57.5 HRC). Although this type of testing yields useful...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001794
EISBN: 978-1-62708-241-9
... steel insufficient fillet radius fractography hardness 4340 (low-alloy steel) UNS G43400 References 1. Shigley J.E. , Mischke C.R. , Budynas R.G. : Mechanical Engineering Design , 7th edn. , p. 80 . McGraw-Hill , New York ( 2004 ) 2. Heat Treater’s...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001792
EISBN: 978-1-62708-241-9
... shafts fracture rotary-bending fatigue steel ratchet marks beach marks star-shaped fracture pattern SEM/EDX analysis fatigue strength SAE 4340 (nickel-chromium-molybdenum alloy steel) UNS G43400 SAE 5046H (low-alloy chromium steel) UNS H50460 References 1. Jing...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001780
EISBN: 978-1-62708-241-9
.... , Influence of nonmetallic inclusion characteristics on the mechanical properties of rail steel . J. Mater. Eng. Perform. 9 ( 6 ), 700 – 709 ( 2000 ) 10.1361/105994900770345584 21. Pearce R. , Mazhar A.A. , Fatigue behaviour of certain high-strength, low-alloy steel sheets . Met...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001504
EISBN: 978-1-62708-217-4
... Wheels 2014 UNS A92014 7079 UNS A97079 H11 UNS T20811 4340 UNS G43400 300M UNS K44220 Corrosion fatigue Pitting corrosion Stress-corrosion cracking References 1. “Metals Handbook Ninth Edition, Vol. 1, Properties and Selection: Irons and Steels” , p. 426...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003552
EISBN: 978-1-62708-180-1
... and welding; it has been termed flaking or fisheyes. Atomic hydrogen can also react with a foreign element in the matrix to form a gas. A principal example is the reaction with carbon in low-alloy steels to form methane (CH 4 ) bubbles. Another example is the reaction of atomic hydrogen with oxygen in...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001495
EISBN: 978-1-62708-221-1
... Abstract An axle shaft in an open-pit mining truck hauling overburden failed after operating for 27,000 h. Previous failures had resulted from longitudinal shear, but this had not, bringing material quality into question. Chemical analysis verified that the part was SAE4340 Ni-Cr-Mo alloy steel...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003540
EISBN: 978-1-62708-180-1
... surface. It can also appear in the stress-relief cracking of chromium-molybdenum steels ( Ref 5 ). Fig. 3 SEM image of fracture surface of nickel-base alloy (Inconel 751, annealed and aged) after stress rupture (730 °C, or 1350 °F; 380 MPa, or 55 ksi; 125 h). (a) Low-magnification view, with...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006784
EISBN: 978-1-62708-295-2
... hydrogen damage, and many are susceptible to more than one type of hydrogen damage. Carbon and low-alloy steels can fail by several types of hydrogen damage. Failure by hydrogen embrittlement is often encountered with high-strength steels, especially when the tensile strength is above 1034 MPa (150 ksi...
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
... The EDS results revealed that two of the larger fragments were consistent with low alloy steel with patches of silver, apparently remnant segments of cage material. The very thin and rippled fragment was found to be Titanium based, the spectral results being most similar to a Ti–6Al–2Sn–4Zr–2Mo as...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001379
EISBN: 978-1-62708-215-0
... Zone 3 (top) and Zone 4 (shear). 500× Fig. 7 shows the microstructure of the failed bolts, which consisted of tempered martensite, typical of a quenched and tempered low-alloy steel. This microstructure compared favorably to the microstructure of bolts from inventory and in the field. The...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001026
EISBN: 978-1-62708-214-3
... stress-corrosion cracking in quenched and tempered steels such as 4340. The apparent grain-boundary surfaces were serrated and stepped, and the valleys, or grooves, that separated the apparent grains in the plane of the fracture showed no signs of fissuring or cracking into the surface, as would be...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001822
EISBN: 978-1-62708-180-1
... steels, such as AISI 4340 and 4140, and type 304 stainless steel were found to be extremely sensitive to copper penetration. In comparison, the penetration depths of AISI 1340, 1050, Armco iron, and carburized Armco iron were only about one-third those of the heat-treated alloy steels. A ferritic...