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rupture time

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Published: 30 August 2021
Fig. 4 Rupture time versus minimum creep rate for service-exposed 9Cr-1Mo steel heater tubes of different vintage and operating conditions More
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Published: 01 June 2019
Fig. 6 Results of the accelerated creep testing. The itme to rupture and the time to 5% additional strain is plotted as a funciton of temperature. More
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Published: 15 May 2022
Fig. 8 Stress rupture test showing regression of strength with time and stress in a particular environment More
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006934
EISBN: 978-1-62708-395-9
... method, one of the most common to describe the material deformation and rupture time, is also discussed. Burgers power-law model creep failure Findley power-law model Larson-Miller parametric method material deformation polymers rupture time service life stress relaxation time-stress...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001669
EISBN: 978-1-62708-229-7
... of approximately 4 for the 621 C test, and a factor of 19 for the 650 C test. The creep-rupture data is given in Table 2 , and the “time to a given creep strain” data in Table 3 for the base and weld metal specimens. Failure of the longitudinal seam-weld specimens occurred outside the gage length...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006807
EISBN: 978-1-62708-329-4
... that generally takes the form shown schematically in Fig. 1(a) . Rupture data: The measurement of the time that rupture occurs, which is essentially the last data point on the abscissa in Fig. 1 . Generally, rupture data are presented in graphic form portraying variations in rupture time with stress...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003545
EISBN: 978-1-62708-180-1
...-operating conditions with available data on creep, stress-rupture, tension, elevated-temperature fatigue, and thermal fatigue properties. Such an analysis is usually sufficient for most failure investigations, but a more thorough analysis may be required when stress, time, temperature, and environment have...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0060154
EISBN: 978-1-62708-234-1
... by metallurgical examination that it had failed as a result of intergranular fissuring and oxidation (creep rupture). The ruptured area revealed that the header had failed by conventional long-time creep rupture as a result of exposure to operating temperatures probably between 900 and 955 deg C. Three samples...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001814
EISBN: 978-1-62708-241-9
... (syngas), a mixture of hydrogen, carbon monoxide, carbon dioxide, water vapor, and minor components. At the time of the incident, the coke feed rate was 900 tons/day. Fig. 1 Gasifiers no. 1 and no. 2. The gasifier no. 1 rupture occurred on the seventh story of the nine-story gasifier During...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006780
EISBN: 978-1-62708-295-2
... with available data on creep, stress-rupture, tension, elevated-temperature fatigue, and thermal fatigue properties. Such an analysis is usually sufficient for most failure investigations, but a more thorough analysis can be required when stress, time, temperature, and environment have changed the metallurgical...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001479
EISBN: 978-1-62708-229-7
..., the material being drawn out to a feather edge at the time of rupture. Other ruptures in the same and other tubes were of a more brittle type, this being associated with penetration of material by molten copper derived from scale. Boiler tubes Copper Scale (corrosion) Steel tube Mixed-mode fracture...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001425
EISBN: 978-1-62708-235-8
... Abstract An 850 ft. long steam main working at a pressure of 120 psi ruptured. Two lengths of pipe were submitted for examination, one containing the rupture and the other from an unaffected part removed to facilitate repair. The rupture surfaces were smooth, suggesting that the failure had...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001726
EISBN: 978-1-62708-234-1
... or no loss in wall thickness due to corrosion or scaling, and the tube wall was thinned to a knife edge at the rupture. Metallographic examination showed the condition of the material was satisfactory. The failure was mechanical in nature, typical of short time creep rupture. The localized oxidation...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0060144
EISBN: 978-1-62708-234-1
... Abstract Two steam-methane reformer furnaces were subjected to short-time heat excursions because of a power outage, which resulted in creep bulging in the Incoloy 800 outlet pigtails, requiring complete replacement. Each furnace had three cells, consisting of 112 vertical tubes per cell, each...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0090277
EISBN: 978-1-62708-229-7
.... These cracks can then propagate with time under constant stress until a critical size is reached, at which point rupture occurs. Considerable research has since shown that Inconel 600 can be susceptible to IGSCC from the environment in a steam generator. It is therefore important to assure that the stress...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0048289
EISBN: 978-1-62708-234-1
... sufficient water in the boiler 2 h before start-up. Six hours after start-up, the center portions of two adjacent tubes in the boiling surface ruptured. The pressure and temperature of the steam at the time of failure were reported to be 8.6 MPa (1.25 ksi) and 399 °C or 750 °F (boiling temperature: 300 °C...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001758
EISBN: 978-1-62708-241-9
... and stress. Extrapolation of stress-rupture curves can be used to estimate longer failure times; however, caution should be exercised as alloy instability (structure changes and precipitation of detrimental phases) occurring at longer testing times can influence stress-rupture lives [ 3 , 4 ]. Fig. 4...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001054
EISBN: 978-1-62708-214-3
... that the specimens tested in dry laboratory air failed predominantly by ductile rupture in the silver. These specimens included those that ruptured immediately in the torque-to-failure test and in the time-to-rupture test. The fractures usually propagated along the silver/silver interface. Figure 3...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001178
EISBN: 978-1-62708-235-8
... a galvanic surface treatment. Such parts will rupture below the elastic limit during continuous stressing. This often occurs only after the expiration of a certain time period, and preferably at locations of stress concentrations such as changes in cross section or threads. As a rule, the hydrogen cannot...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0048331
EISBN: 978-1-62708-229-7
... time at temperatures close to the Ac 1 temperature. Conclusions Rupture of the tube was attributed to thinning of the wall by coal-ash corrosion to the point at which the steam pressure in the tube constituted an overload of the remaining wall. The attack was accelerated by the increase...