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quantitative microstructural measurement

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001605
EISBN: 978-1-62708-217-4
... and origin position, topology, and details of interactions with microstructural features. The aim of this investigation was to use quantitative fractography as a tool to extract information, including striation spacing and size of the stretched zone, in order to make a direct correlation with fracture...
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
...Abstract Abstract The quantitative characterization of fracture surface geometry, that is, quantitative fractography, can provide useful information regarding the microstructural features and failure mechanisms that govern material fracture. This article is devoted to the fractographic...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c9001535
EISBN: 978-1-62708-232-7
.... The polished samples were etched with Villela's reagent (4 g picric acid, 100 mL ethanol, 5 mL hydrochloric acid) for observing the general microstructure comprising alloy carbides, tempered martensite, and retained austenite. Vickers microhardness measurements were carried out parallel with a pneumatic-type...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c9001532
EISBN: 978-1-62708-232-7
..., carbide, and retained austenite from 100%. For ensuring measurement authenticity and accuracy, QIA was carried out over a large number (at least 50) of microscopic fields at 200├Ś magnification to determine the average volume fractions of various microstructural constituents. Fractographic observations...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c9001645
EISBN: 978-1-62708-232-7
... was lower than the desirable minimum hardness. The core hardness of carburizing grades of bearing steel is typically in the range of 25 to 45 HRC 5 and thus consistent with the measured core hardness for both the samples. Characteristics of Nonmetallic Inclusions Microstructural investigation...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.med.c9001664
EISBN: 978-1-62708-226-6
... implants, F138-71. The strength, estimated from the hardness measurements, also met this specification. The hardness and microstructure of the broken plate were similar to those observed on an unused plate obtained from the manufacturer. The plate fractured across the eighth screw hole by fatigue...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001081
EISBN: 978-1-62708-214-3
...,using constant-amplitude loading. A typical result is shown in Fig. 17 , where crack length values measured by liquid penetrant inspection are superimposed for comparison. Again, quantitative fractography results of spin-pit cracks indicated that the fatigue crack growth rates were nearly...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001365
EISBN: 978-1-62708-215-0
.... 2 indicate impeller surface areas containing apparent repair welds. Metallography Microstructural Analysis A section was removed from an area of the impeller that did not exhibit apparent damage. This sample was mounted, ground, polished, and etched for metallographic examination...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001757
EISBN: 978-1-62708-241-9
... that the blade material is consistent with 403 stainless steel. Quantitative chemical compositions of compressor rotor blades are summarized in Table 2 for comparison with the nominal chemical composition of STS403. The measured composition seems to be in agreement with the nominal composition of STS403...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001774
EISBN: 978-1-62708-241-9
... of stainless steels and these are pH of solution, stress level, microstructure, and the presence of chemical species such as elemental sulfur [ 2 ]. In view of their excellent corrosion resistance at moderate temperatures in combination with good mechanical properties, austenitic grades of stainless steels...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001120
EISBN: 978-1-62708-214-3
... to a laboratory for verification of the chemical composition, measurement of hardness, and analysis of the heat-treated microstructure and surface conditions. Testing Procedure and Results Surface Examination The segment was examined visually and with a stereoscopic microscope at magnifications up to 45...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001571
EISBN: 978-1-62708-229-7
...). Conclusions A more precise definition of the thermal history of the TMI-2 lower head can be obtained by the use of selective etching and quantitative microscopy. Although more work needs to be done, and some measurements need to be repeated, it is clear that the cladding in all but one of the TMI-2 boat...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c0089676
EISBN: 978-1-62708-224-2
... of 455 to 595 deg C (850 to 1100 deg F). Examination included visual inspection, macrograph of a nital-etched specimen from an as-received chain link 1.85x, micrographs of a nital-etched specimen from an as-received chain link 100x/600x, normal microstructure of as-cast standard austenitic manganese...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006761
EISBN: 978-1-62708-295-2
... is accomplished by gripping opposite ends of a test specimen within the load frame of a test machine. A tensile force is applied by the machine, resulting in the gradual elongation and eventual fracture of the test specimen. During this process, force-extension data, a quantitative measure of how the test item...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.rail.c9001531
EISBN: 978-1-62708-231-0
... the rim part of real wheels at the same position. The failure specimens were analyzed with a Hitachi S-2700 type scanning electron microscope (SEM). The microstructure parameters were determined by quantitative metallography technology. The composition of inclusions in crack initiation sites was analyzed...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001787
EISBN: 978-1-62708-241-9
... of 18CrNi3Mo steel. The analysis has combined visual observation of fracture surface, inclusions, prior austenitic grain size, hardness measurements, microstructure, and scanning electron microscopy. Experimental Procedure The failed drill bit investigated is shown in Fig. 1 and has a chemical...
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
... quantitative measures of strength and susceptibility to failure. Tensile test and Charpy test were conducted to measure the yield strength, percentage of elongation, and the impact energies of the gearbox shaft and clutch shaft materials, and the results are shown in Table 3 . Mechanical properties...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001833
EISBN: 978-1-62708-241-9
...), THERMO-CALC thermodynamic software, and other techniques to analyze the failure. Experimental Methods The chemical composition of the steam chest material is shown in Table 1 . The mechanical properties of samples machined from the steam chest were measured at room and elevated temperatures...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003537
EISBN: 978-1-62708-180-1
...Abstract Abstract This article provides an overview of fractography and explains how it is used in failure analysis. It reviews the basic types of fracture processes, namely, ductile, brittle, fatigue, and creep, principally in terms of fracture appearances, such as microstructure. The article...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001329
EISBN: 978-1-62708-215-0
... with a leak-detection solution. No leakage was noted. As a second cheek, the valve assembly was immersed in room-temperature water and again pressurized to 2.8 MPa (400 psig). No evidence of leakage (bubble formation) was observed. Testing Procedure and Results Metallography Microstructural...