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microhardness measurements

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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
... contained high-carbon 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...
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
... from 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...
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
... rate 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...
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
.... Although 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...
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
... orange. The owner of the tractor had just purchased it in a used condition, and the repair may have been made just before it was purchased. Metallography EDAX Measurements Microhardness Measurements The spring hanger was made from ferritic malleable cast iron. This is, of course, produced...
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
... nital etch. 63×. The chemical analysis met the requirements of music wire per ASTM B 228, that is, 0.70 to 1.00% C, 0.20 to 0.60% Mn, 0.10 to 0.30% Si, 0.025% max P, and 0.030% max S. Hardness Microhardness measurements were obtained on the longitudinally cross-sectioned wires ( Table 1...
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
... 10.31399/asm.hb.v11.a0003543 • Ahmed R. , Rolling Contact Fatigue , Failure Analysis and Prevention , Vol 11 , ASM Handbook , ASM International , 2002 , p 941 – 956 10.31399/asm.hb.v11.a0003563 Fractography and Metallography Microhardness Measurements and Relative Shell...
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
... 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. Hardness Knoop microhardness measurements obtained on the cross section of spring 1 showed an average hardness of 58 HRC...
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
... electron microscopy. A section 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...
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
... 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 Knoop readings of 207, 271, and 270 HK respectively (where 207 HK ≅ 8.7 HRC...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001122
EISBN: 978-1-62708-214-3
... of the head was conducted using optical microscope. Chemical composition of the hammerhead was determined by emission spectrometry. The chemical compositions of the chip and hammer head were compared using energy-dispersive analysis. Microhardness versus distance from the striking face was also determined...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001761
EISBN: 978-1-62708-241-9
... by scanning electron microscope (SEM) equipped with electron-dispersive X-ray analysis (EDAX). Microhardness gradient through the nitrided layer close to fracture, surface hardness, and macrohardness at the journals were all measured. Fractographic analysis indicated that fatigue was the dominant mechanism...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001842
EISBN: 978-1-62708-241-9
... analysis, microhardness and tensile testing, stress calculations, and vibration measurements. Based on the results, the roll fracture was attributed to high-cycle fatigue associated with a plug weld over one of the five threaded fasteners added to secure a balance weight inside the roll. The balance weight...
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
... to a laboratory for failure analysis. Visual Examination Chemical Analyses Microhardness Measurements Metallographic Examination Weld Metal Conclusions Recommendations Selected References Selected References • Fatigue Failures , Failure Analysis and Prevention , Vol 11 , ASM...
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
... and Microhardness Measurement To determine the grade of the alloy, one piece was cut from the failed marriage bolt and tested using atomic absorption spectrometry. According to manufacturer’s documents the bolt was made from ASTM A193 B16 (Cr-Mo-V) steel. This material is considered as the most suitable...
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
...–1.06 Sulfur 0.06 max 0.06 max Phosphorus 0.05 max 0.05 max 3.1 Visual Examination 3.2 X-Radiographic Examination 3.3 Fractographic Examination 3.4 Metallographic Examination 3.5 Microhardness Measurements 3.6 Impact Testing 3.7 Chemical Analysis The failed...
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
... penetration of corrosion attack. 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...
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
... in Table 1 . The chemical composition of the stem conformed to the specified composition, whereas the chemical composition of the sleeve material suggested that it was an austenitic stainless steel. Hardness Microhardness measurements (25 g load) were taken on the weldment/heat-affected zone (HAZ...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001770
EISBN: 978-1-62708-241-9
... showing various zones with cracks: ( a ) “lightning” cracks in base metal, and (b) cracks in weld bead and HAZ (magnification: 5×) The transverse and capping face samples were prepared for microhardness measurements and microstructural examination by conventional grinding and polishing technique...
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...