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microhardness testing

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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
... Abstract This chapter discusses the operating mechanism, applications, advantages, and limitations of Brinell hardness testing, Rockwell hardness testing, Vickers hardness testing, Scleroscope hardness testing, and microhardness testing. In addition, the general precautions and selection...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060149
EISBN: 978-1-62708-261-7
... clues to the structure and properties of metals and their alloys. Micrographs provide a permanent record of the structure of a material and are published extensively in all types of documents. When used in conjunction with a microhardness test, a micrograph can be useful in relating microstructure to...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2020
DOI: 10.31399/asm.tb.bpapp.t59290085
EISBN: 978-1-62708-319-5
... Abstract This chapter is a detailed account of various attributes related to mixing and testing of powder-binder feedstocks. Mixing parameters and their effects on feedstock properties is discussed. The attributes reviewed include mixture homogeneity, wetting, powder-binder ratio, feedstock...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.mgppis.t60400149
EISBN: 978-1-62708-258-7
... microscopes, x-ray diffractometers, microhardness testers, and hot microhardness testers. A list of other instruments that are usually located in a research laboratory or specialized testing laboratory is also provided. electron probe microanalyzers image analyzers metallographic laboratory...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.pht2.t51440027
EISBN: 978-1-62708-262-4
... commonly used hardness testing systems: the Brinell, Rockwell, Vickers, Scleroscope, and various microhardness testers that employ Vickers or Knoop indenters. The effect of carbon content on annealed steels and hardened steels is then discussed. A brief discussion on the concept of the ideal critical...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430107
EISBN: 978-1-62708-253-2
... ). During Vickers hardness testing of a sample, measurement of diagonal lengths of the impression using microscope eyepiece rulers becomes difficult, particularly when indentation is made at lower loads of 10 to 200 g. Image analysis software can be used to measure the microhardness of a sample, provided a...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 April 2013
DOI: 10.31399/asm.tb.imub.t53720393
EISBN: 978-1-62708-305-8
... encounters hidden pores. Microhardness testing and measurement of case depth are covered by Metal Powder Industries Federation standard MPIF 37. Metal Powder Industries Federation standard 10 describes specimens for tensile testing. Specimens include flat unmachined test bars or machined rounds...
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
... Hardness Testing Instruments, ” J. Iron Steel Inst. , vol. 169 , 1951 , pp. 376 – 388 . 46. Bückle H. : “ Investigations of the Effect of Load on the Vickers Microhardness, ” Z. Metallkund. , vol. 45 , no. 11 , 1954 , pp. 623 – 632 (ATS no. 37G5G). 47. Bückle H...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 April 2013
DOI: 10.31399/asm.tb.imub.t53720001
EISBN: 978-1-62708-305-8
... Microhardness 136° diamond indenter or a Knoop indenter 40 μm (0.16 μin.) 1–4 μm (0.004–0.016 μin.) 1 gf–1 kgf Measure indentation with low-power microscope; read hardness from tables Polished surface Up to 60 Surface layers, thin stock, down to 200 μm Laboratory test used on brittle materials or...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.pht2.t51440283
EISBN: 978-1-62708-262-4
... center of that mark was made using a Brinell glass. The reading was then recorded as effective case depth in thousandths of an inch. The referee method for checking effective case depth was by Knoop 500 g microhardness testing to a depth of 50 HRC equivalent. At least one of every ten checks and/or...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.smnm.t52140039
EISBN: 978-1-62708-264-8
... microhardness test available. The test uses very light loads and makes indent diameters small enough to fit into microsized regions. It uses a microscope that allows the indent to be positioned at desired locations on a microstructure, and the size of the indent is measured with the same microscope. There are...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910475
EISBN: 978-1-62708-250-1
... carbon or nitrogen pickup. Hardness testing is also essentially nondestructive, except when preparation of a special hardness-test specimen is required, as in microhardness testing. Other mechanical tests are useful in confirming that the failed component conforms to specification or in evaluating...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610025
EISBN: 978-1-62708-303-4
... test for large steel parts, such as crankshafts, where a minimum of depth of penetration is needed. Microhardness tests can be made on individual constituents of a microstructure, with the hardness of particles as small as 0.18 mm (0.007 in.) being determined. Fig. 28 Hardness tests. Source...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130043
EISBN: 978-1-62708-284-6
... and hardening or softening from localized thermal events such as grinding. For the most part, it is a nondestructive test. For microhardness testing, it is necessary to use a metallographic specimen. Tensile testing is used more to establish conformance to specification. It is not necessary to...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 April 2013
DOI: 10.31399/asm.tb.imub.t53720293
EISBN: 978-1-62708-305-8
.... Portable hardness testers or ultrasonic microhardness testers can be used on large castings that cannot be placed on the platform of a bench type machine. The hardness of ferrous castings can be determined from the sonic velocity of the metal if all other test conditions remain constant. This has been...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050245
EISBN: 978-1-62708-311-9
... hardness testing is the current version for Rockwell testing, ASTM E18-88, and for microhardness testing, ASTM 384. Rockwell testers are most commonly used, while microhardness testers are used for specific applications. SAE J423 applies to the destructive method of determining case depth, whereas ASTM E3...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2020
DOI: 10.31399/asm.tb.bpapp.t59290193
EISBN: 978-1-62708-319-5
... 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 between indents allows mapping of property gradients. Soft materials result in large indents, corresponding to a lower hardness...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270177
EISBN: 978-1-62708-301-0
... Abstract A driven gear in the gear box of an aircraft engine fractured after a 40 h test run. The driving gear and gear shaft were also damaged. Based on the results of fractography, chemical analysis, metallography, and hardness testing, the fracture was caused by a fatigue crack initiating at...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240201
EISBN: 978-1-62708-251-8
... by the penetrator. The Brinell hardness tester is another widely used test for large steel parts, such as crankshafts, where a minimum of depth of penetration is needed. Microhardness tests (Vickers and Knoop) can be made on individual constituents of a microstructure, and it is possible to determine...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050263
EISBN: 978-1-62708-311-9
... microhardness test may be the only test that can determine that the decarb layer exists. Determine if further machining will be done. If so the decarb may not be detrimental to the use of the workpiece. Check the hardness below the decarb, and if the workpiece is in specification, note on the inspection record...