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Knoop hardness test

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Published: 01 January 2000
Fig. 2 Knoop hardness test. (a) Schematic of the rhombohedral-shaped diamond indenter used for the Knoop test and an example of the indentation it produces. (b) Knoop indents made in ferrite in a ferritic-martensitic high-carbon version of 430 stainless steel using (left to right) 500, 300 More
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003272
EISBN: 978-1-62708-176-4
... Abstract This article provides a discussion on the equipment used and specimen preparation for microindentation hardness testing (MHT) such as the Vickers hardness test and the Knoop hardness test. It describes the important test considerations to be considered during MHT. The article also...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003274
EISBN: 978-1-62708-176-4
... of the Knoop and the Vickers hardness in ceramics. It explicates how to estimate fracture toughness from Vickers indentation cracking. The article also provides information on instrumented hardness testing and the Meyer law. indentation hardness testing microindentation hardness ceramics deformation...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0009224
EISBN: 978-1-62708-176-4
... surface area, while the Knoop hardness is the load divided by the projected area, and hence corresponds to the Meyer value. The hardness test is very easily conducted, but not so easily interpreted. Action beneath the indenter is complex, and must be understood if full use is to be made of hardness...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003276
EISBN: 978-1-62708-176-4
... Abstract This article reviews the factors that have a significant effect on the selection and interpretation of results of different hardness tests, namely, Brinell, Rockwell, Vickers, and Knoop tests. The factors concerned include hardness level (and scale limitations), specimen thickness...
Image
Published: 01 January 2000
Fig. 17 Minimum thickness of test specimens for the Knoop test as a function of applied force (load) and Knoop hardness More
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006761
EISBN: 978-1-62708-295-2
... Microindentation hardness testing Vickers hardness Hardness Result does not always correlate to bulk material hardness Values vary with applied loads Requires a polished surface Knoop hardness Hardness Result does not always correlate to bulk material hardness Values vary with applied loads Requires...
Image
Published: 31 December 2017
Fig. 38 Microhardness surveys on case-hardened steels. (Upper two rows of graphs) Results of hardness traverses made with Knoop indenter (100 g load) on cross sections of the steels after they were nitrided for 48 h at 525 °C (975 °F). White layer was removed by polishing before hardness More
Image
Published: 01 December 2004
Fig. 7 Midheight of the thread flank (arrows). This is the standard test location for evaluating decarburization or carburization by Knoop or Vickers microindentation hardness methods. More
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003270
EISBN: 978-1-62708-176-4
... in deforming the test surface. Since the indenter is pressed into the material during testing, hardness is also viewed as the ability of a material to resist compressive loads. The indenter may be spherical (Brinell test), pyramidal (Vickers and Knoop tests), or conical (Rockwell test). In the Brinell, Vickers...
Series: ASM Handbook
Volume: 4A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v04a.a0005795
EISBN: 978-1-62708-165-8
... to convert Knoop or Vickers measurements directly into Rockwell values, the chance for error is reduced. However, it must be remembered that any conversion of hardness values from one hardness measurement system to another introduces some error. See Table 4 and Fig. 14 for Vickers, Brinell, Knoop...
Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.a0005184
EISBN: 978-1-62708-186-3
... for nonaustenitic steels, according to ASTM E 140 Table 3 Approximate Rockwell C hardness conversion numbers for nonaustenitic steels, according to ASTM E 140 C, 150 kgf, diamond A, 60 kgf, diamond D, 100 kgf, diamond 15 N, 15 kgf, diamond 30 N, 30 kgf, diamond 45 N, 45 kgf, diamond Vickers Knoop...
Series: ASM Handbook
Volume: 4D
Publisher: ASM International
Published: 01 October 2014
DOI: 10.31399/asm.hb.v04d.a0006001
EISBN: 978-1-62708-168-9
..., according to ASTM E140 Table 3 Approximate Rockwell C hardness conversion numbers for nonaustenitic steels, according to ASTM E140 C, 150 kgf, diamond A, 60 kgf, diamond D, 100 kgf, diamond 15 N, 15 kgf, diamond 30 N, 30 kgf, diamond 45 N, 45 kgf, diamond Vickers Knoop, 500 gf and over...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004043
EISBN: 978-1-62708-185-6
... for nonaustenitic steels Table 2 Approximate Rockwell B hardness conversion numbers for nonaustenitic steels Rockwell Superficial Rockwell Vickers Knoop, 500 gf and over Brinell, 3000 kgf, 10 mm ball Tensile strength MPa (ksi) Brinell, 500 kgf, 10 mm ball B, 100 kgf, 1 16 in. ball...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003278
EISBN: 978-1-62708-176-4
... Rockwell B hardness conversion numbers for nonaustenitic steels Rockwell Superficial Rockwell Vickers Knoop, 500 gf and over Brinell, 3000 kgf, 10mm ball Tensile strength, MPa (ksi) Brinell, 500 kgf, 10mm ball B, 100 kgf, 1 16 in. ball A, 60 kgf, diamond E, 100 kgf, 1...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003241
EISBN: 978-1-62708-199-3
... of the indentation when using a Vickers indenter, and at least 1 2 times the long diagonal when using a Knoop indenter. (a) No minimum hardness for metal of equal or greater thickness. To use the values in Table 4 , assume that it is necessary to check the hardness of a strip of steel 0.014...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.9781627082952
EISBN: 978-1-62708-295-2
Series: ASM Handbook
Volume: 5A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v05a.a0005730
EISBN: 978-1-62708-171-9
... the tests for the measurement of the hardness of coatings. The Vickers hardness test is the standard microhardness test employed for thermal spray coatings (Knoop microindentation hardness testing is less widely used). As shown in Fig. 1 , the Vickers hardness test uses a square-based diamond pyramid...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0005689
EISBN: 978-1-62708-176-4
... tests of unnotched specimens. ther roughening of the rubbing surfaces of Rockwell, Vickers, Knoop, and Scleroscope one or both of two mating parts. (2) A severe hardness tests. fracture test. A test in which a specimen is bro- form of scuffing associated with gross dam- ken and its fracture surface...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.9781627081764
EISBN: 978-1-62708-176-4