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microhardness measurements

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Published: 01 December 1992
Fig. 12 Grid pattern of microhardness measurements used to determine plastic zone size. More
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Published: 01 December 1992
Fig. 13 Typical results of microhardness measurements at crack tip of compressor disk bolt hole crack. More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001616
EISBN: 978-1-62708-229-7
... Stage 2 (where corrosion was low) and Stage 3 (severe corrosion) were taken and subjected to visual inspection, SEM, x-ray diffraction, microhardness measurement, and chemical and microstructural analysis. It was determined that extended non-operation of the plant resulted in the settlement of corrosive...
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
... tempered martensite. Microhardness measurements revealed that. Although the core hardness of the roller and the inner-race samples were similar, the surface hardness of the roller was approximately 8.5 HRC units harder than that of the inner-race. SEM observations of the roller fracture surface revealed...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001351
EISBN: 978-1-62708-215-0
... on the order of 1 x 10−7 cu cm/s (6 x 10−8 cu in./s). Optical metallography revealed numerous pits and cracks on the surfaces of the bellow convolutes, which had been welded to one another using an autogenous gas tungsten arc welding process. Microhardness measurements indicated that the bellows had not been...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001307
EISBN: 978-1-62708-215-0
... 95.8 0.6 1.1 3 Base metal 95.9 0.4 3.7 Microhardness Measurements Microhardness measurements were carried out on the specimen shown in Fig. 4 using a Vickers rnicrohardness tester with a 200 gm (7 oz) load. The results are shown in Table 2 . Standard deviations are not given...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001267
EISBN: 978-1-62708-215-0
...% C, 0.20 to 0.60% Mn, 0.10 to 0.30% Si, 0.025% max P, and 0.030% max S. Mechanical Properties Hardness Microhardness measurements were obtained on the longitudinally cross-sectioned wires ( Table 1 ). The longitudinal indentations were obtained in the center of the wire, indicating...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.rail.c9001659
EISBN: 978-1-62708-231-0
... revealed patches of white layers along the shell fracture surface ( Figure 13 ). Microhardness measurements in the white layer with a 25 g load indicated very high hardness compared to material just below the layer. The measurements are presented in Table 1 . Based on the microhardness measurements...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001118
EISBN: 978-1-62708-214-3
... spectrum obtained on the wire base metal using a 20kV beam voltage. Fig. 12 EDX microprobe spectrum obtained on a typical inclusion in spring 2 using a 20kV beam voltage. Mechanical Properties Hardness Knoop microhardness measurements obtained on the cross section of spring 1 showed...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001837
EISBN: 978-1-62708-241-9
... no cracks were found when the welds were visually inspected, X-ray radiography showed small discontinuous surface cracks adjacent to the weld bead in the heat affected zone. Further investigation, including optical microscopy, microhardness testing, and residual stress measurements, revealed that the cracks...
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
... was removed for metallographic examination, on which microhardness measurements were made in order to estimate the strength of the material. For purposes of comparison, a similar examination was made of an unused, unbroken device obtained from the manufacturer of the broken device. The results of the entire...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001051
EISBN: 978-1-62708-214-3
... A specimen was cut perpendicular to the long axis of sample B. This section was mounted in epoxy, metallurgically ground and polished, and then etched in a 10% nital solution. A series of knoop microhardness measurements was performed. The base material, heat-affected zone (HM), and weld metal had average...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001830
EISBN: 978-1-62708-241-9
... 0.2–0.35 0–0.04 0–0.04 0.45–0.7 0.8–1.15 0.5–0.65 0.25–0.35 Hardness and Microhardness Measurement To determine the hardness of the alloy, Vickers hardness measurements were carried out on several points from the outer surface to the central zone of the polished surface of the bolt...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0046252
EISBN: 978-1-62708-229-7
... did not affect material properties. Microhardness Measurements Microhardness measurements were taken on three sections of pipe and on two weld samples. Hardness readings taken within the carburized zone at the inner surface of the pipe wall averaged 36 HRC; near the center of the wall, 90 HRB...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001381
EISBN: 978-1-62708-215-0
... 1.87 1.65–2 Chromium 0.75 0.70–0.90 Molybdenum 0.25 0.20–0.30 Aluminum 0.034 NR Calcium 0.0012 NR (a) NR, no requirement Mechanical Properties Hardness Knoop microhardness measurements were conducted using a 500 g load. Longitudinal specimens had an average...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001125
EISBN: 978-1-62708-214-3
.... Mechanical Properties Hardness Because there was no indication of the involvement of mechanical factors in the failure, microhardness measurements were performed only as a check. Table 1 presents the results, which indicated a softening of the HAZ. Results of microhardness testing Table 1...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c0048596
EISBN: 978-1-62708-221-1
... of the outer surface of the bolts, to a depth of about 6.4 mm ( 1 4 in.), was tempered martensite. The structure of the interior of the bolts was pearlitic. Microhardness measurements on the polished surfaces of the metallographic specimens showed the hardness of the surface layer to correspond...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001534
EISBN: 978-1-62708-220-4
... of cracking. Fig. 8 Crack joining inclusions Fig. 9 Cracks emanating from inclusion sites Fig. 10 Blisters around inclusions Fig. 11 Decohesion of inclusion/matrix interface 3.5 Microhardness Measurements Microhardness measurements (using a 50 g load) carried...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001352
EISBN: 978-1-62708-215-0
... Properties Hardness Microhardness measurements (25 g load) were taken on the weldment/heat-affected zone (HAZ)/base metal interface at location B ( Fig. 2 ). Atypical microhardness profile obtained in this region is shown in Fig. 11 . Fig. 11 Microhardness profile across weld/HAZ/base metal...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001671
EISBN: 978-1-62708-234-1
...” that is apparent after etching in picral or nital along the bore surface of a gun ( Figure 6 ). The white-etching layer is generally a few thousandths of a millimetre thick. Several investigators reported as many as four separate layers in the white-etching layer. These layers were differentiated by microhardness...