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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 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...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.mgppis.t60400149
EISBN: 978-1-62708-258-7
... about hot-stage microscopy can be found in the references at the end of the chapter. Generally, a good metallographically prepared specimen is required for microhardness testing. The surfaces of the specimen must be flat and parallel to avoid erroneous readings. For uneven samples, a leveling device...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.pht2.t51440027
EISBN: 978-1-62708-262-4
..., and disadvantages of 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...
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
... of the impression is a finely polished surface required. As is shown in a later section, the quality of the polished surface affects the microhardness values substantially as the test load decreases. 5-3 Static Hardness Tests Many different hardness tests and evaluation procedures have been developed...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050245
EISBN: 978-1-62708-311-9
... Testing Microhardness Testing Microstructures Magnetic Particle Inspection Spray-on and Liquid Penetrants Ultrasonic Inspection Eddy-Current Instruments Radiographic Inspection Workpiece Preparation for Surface Testing Decarburization as a Source of Error Minimum Case-Depth...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.pht2.t51440283
EISBN: 978-1-62708-262-4
... 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 any check of effective case depth not within the specified limits...
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...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1999
DOI: 10.31399/asm.tb.cmp.t66770037
EISBN: 978-1-62708-337-9
... for this is similar to the upper curve of Fig. 2.12(b) . Hardness reductions are obtained when low-carbon martensites or bainites are produced from a carbon gradient such as Fig. 2.12(a) . If the reduced hardness resembles a “skin” effect, it might not be detected by macrohardness testing. Microhardness testing...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060149
EISBN: 978-1-62708-261-7
... Hardness Macrohardness Testing Microhardness Testing Nanohardness Testing Hardness Conversion Vickers Indenter Knoop Indenter Brinell Test Rockwell Hardness Test Superficial Rockwell Hardness Test In microhardness testing , loads are less than 1 kgf, and indentations can...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.9781627083119
EISBN: 978-1-62708-311-9
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2000
DOI: 10.31399/asm.tb.htgpge.t67320133
EISBN: 978-1-62708-347-8
... measurement. Effective case depth is determined by a properly calibrated microhardness tester using a 500 g load and Knoop indenter. The microhardness impressions should be spaced so that they are not disturbed by adjacent impressions. There should be positive assurance that the surface being tested...
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
... of hardnesses where the various tests are not applicable are shown either with blanks or by using parentheses. Notice that the Vickers test is the only one that applies at all hardness levels. Microhardness: Diamond Pyramid and Knoop As shown in the second row from the bottom of Table 5.2...
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
... that they are not disturbed by adjacent impressions. There should be positive assurance that the surface being tested is normal to the indenter. Surfaces to be microhardness tested should be properly polished (scratch-free) and lightly etched in 4% nital solution. When microhardness tests indicate unacceptable results, two...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2006
DOI: 10.31399/asm.tb.cw.t51820077
EISBN: 978-1-62708-339-3
... corrosion resistance in boiling 50% ferric sulfate-50% sulfuric acid solution. (b) No cracking as determined by slow bending around a 5 mm (0.2 in.) mandrel Results of ASTM A 763, practice Z, tests on as-welded ferritic stainless steels with titanium or niobium Table 8 Results of ASTM A 763...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 April 2013
DOI: 10.31399/asm.tb.imub.t53720393
EISBN: 978-1-62708-305-8
... manufacturing for part acceptance and process control. The various types of tests included are: Dimensional evaluation Density measurements Hardness testing Mechanical testing NDT Dimensional Evaluation Density Measurement Apparent Hardness and Microhardness Mechanical Testing...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.pht2.t51440207
EISBN: 978-1-62708-262-4
... as discussed for tool steels in Chapter 11, “Heat Treating of Tool Steels,” except that extremely hard microconstituents were involved; for cast irons, soft constituents cause inaccuracies in hardness testing. In either case, microhardness testing is the only approach for determining true hardness...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.pht2.t51440191
EISBN: 978-1-62708-262-4
.... The general principles of hardness and hardness measurement are discussed in Chapter 3 (“Hardness and Hardenability” ), where it is indicated that microhardness testing is often required to reveal true conditions. For most carbon and alloy steels, the apparent, or measured, hardness as indicated by test...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.tb.hpcspa.t54460121
EISBN: 978-1-62708-285-3
... 14 Oxygen analysis Feedstock powder characterization 15 Surface roughness As-sprayed coating, distinguishing between process parameters, gas type 16 Microhardness Screening tool for coating 17 Nanoindentation Coating characterization, deformation 18 Bond adhesion test Evaluating...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1999
DOI: 10.31399/asm.tb.cmp.t66770011
EISBN: 978-1-62708-337-9
... gears Steel Process (a) Case depth, mm Macrohardness, HRC Depth of nonmartensitic Layer, μm Microhardness in tooth roots, HV 0.2 Residual stress at a depth of 10 μm Bending fatigue limit Surface Core kg/mm 2 MPa kg/mm 2 MPa 25KhGM CN 1.0 59/61 39/44 6 560/720...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130241
EISBN: 978-1-62708-284-6
... of atmosphere, that is, NH 3 -NH3(diss) and NH 3 -N 2 . In the nitriding processes, the atmosphere gas composition was varied, as were the time of nitriding (4 and 16 h) and the nitriding potential, K N (from 1.65 to 4.8). Fatigue resistance tests were carried out on the PUNZ machine (manufactured...