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maraging steels

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Published: 01 January 2002
Fig. 15 Fatigue fracture in 18% Ni, grade 250, maraging steel tested at room temperature. (a) Extensive secondary cracking can be seen in a lower-magnification fractograph. 126×. (b) The cracking is clearly evident in a higher 1440× magnification fractograph. Secondary cracks formed at the roots More
Image
Published: 01 January 2002
Fig. 30 Tensile fracture of maraging steel showing transition from cup feature from one half of the fracture to the other half, that is, not a complete cup-and-cone More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001910
EISBN: 978-1-62708-217-4
...Abstract Abstract Breech bolt assemblies from the Gatling guns used on fighter aircraft failed during firing tests. Metallography of the failed components revealed considerable decarburization which resulted in a loss of surface hardness. It was also determined that the maraging steel...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0047010
EISBN: 978-1-62708-234-1
... alloys including a maraging steel (18% Ni, grade 250), a vanadium-modified 4337 gun steel (4337V), H19 tool steel, and high-temperature alloys Rene 41, Inconel 718, and Udimet 630. All the alloys evaluated had been used in mortar tubes previously or were known to meet the estimated minimum yield strength...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001717
EISBN: 978-1-62708-217-4
..., the pilot had to perform a low hover maneuver to the maintenance facility, where ground crews assembled concrete blocks at the appropriate height to allow the aircraft to safely touch down. The failed part was fabricated from maraging 300 grade steel (2,068 MPa [300 ksi] ultimate tensile strength...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001904
EISBN: 978-1-62708-217-4
... about 10,000 h. Cumulative damage resulting from a previous accident could have occurred too. Because of this accident, inspectors were instructed to examine threaded zones of eyebolts by magnetic particle inspection after every 100 h in service. A maraging steel drive shaft of a helicopter also failed...
Image
Published: 01 January 2002
Fig. 20 Beach marks on (a) quenched-and-tempered alloy steel pin fractured in low-cycle fatigue ( Ref 4 ), and on (b) maraging steel stud fractured in the laboratory by stress-corrosion cracking under steady load ( Ref 16 ). The presence of beach marks is indicative of progressive cracking More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001670
EISBN: 978-1-62708-217-4
... hardness profile; and, (3) X-ray phase definition. Material and Fabrication/Thermal History The TOW flight missile case, Figure 1 , was made from 300 grade 18% Ni-maraging steel. The overal length is approximately 15.5 inches with a wall thickness of 0.071 inches ± 0.003 inches. The open end...
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
... cases of IG fracture are described as follows ( Ref 4 ): Precipitation of AlN phase on the prior-austenite grain boundaries when steel is slowly cooled after austentization at temperatures above 1300 °C (2370 °F), or slowly cooled after casting Thermal embrittlement of maraging steels...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006777
EISBN: 978-1-62708-295-2
... are described as ( Ref 4 ): Precipitation of AlN phase on the prior-austenite grain boundaries when steel is slowly cooled after austenitization at temperatures above 1300 °C (2370 °F), or slowly cooled after casting Thermal embrittlement of maraging steels by titanium carbonitrides Overheating...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003553
EISBN: 978-1-62708-180-1
... steel chemical analysis copper alloys crack initiation crack propagation duplex stainless steel ferritic stainless steel fracture surface characteristics low alloy steel macroscopic examination magnesium alloys maraging steel martensitic stainless steel metallographic analysis metalworking...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006785
EISBN: 978-1-62708-295-2
... Engineering Experiment Station concluded, “The results which have been obtained justify the opinion which has prevailed in the United States that mild steel is embrittled by sodium hydroxide… Stress and chemical attack now appear to be the predominating factors, neither of which can produce embrittlement...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001707
EISBN: 978-1-62708-217-4
... specified for the investigated components, it is most likely that embrittlement resulted from the hydrogen generated during electroplating. Low alloy steels, martensitic stainless steels, maraging steels, PHSS are known to be susceptible to hydrogen embrittlement when heat treated to high strength...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006769
EISBN: 978-1-62708-295-2
... of the crack front with each stress cycle. This is illustrated in Fig. 13 for an aluminum alloy, Fig. 14 for a type 304 stainless steel, and Fig. 15 for a grade 250 maraging steel. Fig. 13 Ductile fatigue striations in aluminum alloy 2024-T3. (a) The uniformity of the crack-propagation process...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003533
EISBN: 978-1-62708-180-1
... for a Type 304 stainless steel, and Fig. 15 for a Grade 250 maraging steel. Fig. 13 Ductile fatigue striations in aluminum alloy 2024-T3. (a) The uniformity of the crack-propagation process is well illustrated. There was little or no interaction of the fracture process with the inclusion within...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003539
EISBN: 978-1-62708-180-1
... ( Ref 4 ), and on (b) maraging steel stud fractured in the laboratory by stress-corrosion cracking under steady load ( Ref 16 ). The presence of beach marks is indicative of progressive cracking but not necessarily fatigue. The stress-intensity factor (particularly its cyclic range) characterizes...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006776
EISBN: 978-1-62708-295-2
... by corrosion product (rust, appears dark in this photograph), but the last bands of fatigue fracture remained clean. Arrows mark the fatigue crack boundaries. Fig. 20 (a) Beach marks on quenched-and-tempered alloy steel pin fractured in low-cycle fatigue ( Ref 4 ), and (b) arrest lines on a maraging...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006775
EISBN: 978-1-62708-295-2
... set of circumstances that can cause specimen-scale shear banding is the combination of minimum strain hardening and negative strain-rate hardening. A second case in which the central fibrous zone is (apparently) absent has been reported in an HY-100 steel. Both cases are discussed in this article...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003538
EISBN: 978-1-62708-180-1
... that can cause specimen-scale shear banding is the combination of minimum strain hardening and negative strain rate hardening. A second case in which the central fibrous zone is (apparently) absent has been reported in an HY-100 steel. Both cases are discussed in this article. When edge- or center...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003536
EISBN: 978-1-62708-180-1
... surface of a tensile test specimen of a metal-matrix composite (MMC) containing unidirectionally aligned alumina fibers in the matrix of an aluminum alloy. Figures 2(b) and 2(c) show a fracture profile from the tensile fracture surface of a low-alloy steel specimen. These fracture surfaces were...