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microhardness measurements

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430107
EISBN: 978-1-62708-253-2
... of carburization/decarburization, scale thickness, pearlite banding, microhardness, and hardness profiles. The chapter concludes with a brief discussion on the effect of scaling and deposition and how to measure it. References References 5.1 Wikibooks , “ Material Science/Material Characterization...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.pht2.t51440027
EISBN: 978-1-62708-262-4
... components of a typical microhardness tester are shown in Fig. 11 , which demonstrates how the indentation is made on the specimen, as well as the repositioning of the specimen for measurement by a special type of microscope. Programmable, digital, and direct-reading microhardness testing equipment...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270191
EISBN: 978-1-62708-301-0
... of the blades with differential etching and microhardness measurements in the suspected regions did not reveal any delta ferrite. Fig. CH53.5 Hardness profile and microstructures along the longitudinal section of the airfoil region of a blade Fig. CH53.6 Hardness profile and microstructures...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2020
DOI: 10.31399/asm.tb.bpapp.t59290193
EISBN: 978-1-62708-319-5
... and the indentation diameter measured. A hard material produces a small indentation. The Vickers test relies on small indents measured through a microscope; it is a microhardness test. The indenter is placed on microscopic targets, such as individual phases. Evaluation of hardness versus position using small movement...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130417
EISBN: 978-1-62708-284-6
... of the crankshaft and on sample C on the extreme left side. Source: Ref 15 , 20 , 44 Fig. 51 Microhardness and residual-stress profiles at various heating times, t H1 – t H4 . Source: Ref 15 , 54 Fig. 56 Residual-stress profiles for six measurements on four bearing locations after...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.htcma.t52080359
EISBN: 978-1-62708-304-1
... locations of the tube. Cracking occurred at the bottom half of the opening (right-hand side of the tube). Rockwell C hardness values (converted from Vickers microhardness values) were reported in a range at different locations of the tube as well as the hardness at 0.25 mm (0.01 in.) from the cladding...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1984
DOI: 10.31399/asm.tb.mpp.t67850334
EISBN: 978-1-62708-260-0
... appreciated but not readily measured for one would hope to express it in terms of fundamental units” [ 1 ]. This statement accurately reflects the fundamental foible of hardness; i.e., although it is an intuitively simple concept and hardness tests are widely used in the metals industry because of their low...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130241
EISBN: 978-1-62708-284-6
... on micrographs and microhardness measurements. An analysis of static test results delivers new data. The tensile plot for the carbonitrided material is characteristic of brittle materials. There is no necking and no elongation of the specimen. Similar behavior was noted when the bending strength test...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430409
EISBN: 978-1-62708-253-2
..., radiography, magnetic particle inspection, dye penetrant testing, in situ replication and metallography, eddy current testing, fibroscopy, acoustic emission, positive material identification, hardness and microhardness measurement, flattening testing, microstructural evaluation, and accelerated creep tests...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 April 2013
DOI: 10.31399/asm.tb.imub.t53720085
EISBN: 978-1-62708-305-8
.... Microhardness testing is recognized as a valuable method for controlling numerous production operations in addition to its use in research applications. Specific fields of application of microhardness testing include: Measuring hardness of precision workpieces that are too small to be measured by the more...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.mgppis.t60400149
EISBN: 978-1-62708-258-7
.... These measurements cannot be performed by a conventional Brinell, Vickers, or Rockwell hardness tester, because the indentation size far exceeds the dimensions of an individual constituent. In fact, the conventional hardness tester obtains an average or bulk hardness of a particular microstructure. A microhardness...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900245
EISBN: 978-1-62708-350-8
... method of measuring case depth is by a microhardness traverse from the surface through the case of a sectioned, preground, and polished sample. Optical examination via light microscopy will show the case metallurgy, from which an assessment of the case depth can be made, but this method is not completely...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430325
EISBN: 978-1-62708-253-2
... of the tube consisted of grains of ferrite and bainite ( Fig. 6.139b ). The results of hardness and microhardness measurements as well as a tensile test were satisfactory. The metallurgical integrity of the superheater tube appeared to be sound. Fatigue as the cause of crack initiation was revealed...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900167
EISBN: 978-1-62708-350-8
... of the sample after microhardness testing and provides practices that contribute to the safe preparation of specimens. Examples of nitrided case microstructures, using optical light microscopy, are also presented. hardness testing microstructure nitrided case optical light microscopy sample...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130285
EISBN: 978-1-62708-284-6
..., Pb, Cd, Zn, Na Copper alloys Hg, Ga, Bi, Zn, Li, Sn, Pb, In Zirconium alloys Hg, Cd, Cd-Cs, Zn Nickel alloys Hg, In, Li, Zn, Ag Magnesium alloys Na, K, Rb, Cs, Zn Source: Ref 45 Microhardness values of the worn cam shaft cross section Table 7 Microhardness values...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050245
EISBN: 978-1-62708-311-9
... of indentations made, with obvious low readings discarded and the other readings averaged. Microhardness testing is necessary for accurate testing of the cast irons that have graphite, such as ductile cast iron, and microhardness is also used for the measure of case depths on automotive parts such as wheel hubs...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.tb.hpcspa.t54460121
EISBN: 978-1-62708-285-3
... electron microscopy, transmission electron microscopy, electron backscatter diffraction, and electron probe microanalysis are integral to understanding the highly nonequilibrium process that enables the formation of thick adherent coatings via severe plastic deformation of metal powders. Microhardness...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250227
EISBN: 978-1-62708-345-4
.... For these steels, effective case depth at 40 HRC works very well ( Ref 1 ). In the case of some gear materials with core hardness approaching 40 HRC, a higher hardness, such as 45 HRC, may be considered for an effective case depth measurement. Effective case depth is determined by a properly calibrated...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2000
DOI: 10.31399/asm.tb.htgpge.t67320159
EISBN: 978-1-62708-347-8
... and solid solution hardening. This zone is detected as a dark etching region below the surface, varying in hardness from the surface to the core. This region is measured as case and may be as deep as 0.9 mm (0.035 in.), depending on the type of steel, nitriding cycle time, and temperature. On the other hand...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.9781627083119
EISBN: 978-1-62708-311-9