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microhardness testing

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Published: 30 August 2021
Fig. 19 Microhardness test results. (a) Arrangement and serial numbers of test positions. (b) Comparison of test results More
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
... methods of measuring case depth in steels, including chemical methods such as the combustion analysis and spectrographic analysis, microhardness test method, macroscopic and microscopic visual methods, and nondestructive methods. It contains a table that provides approximate equivalent hardness numbers...
Series: ASM Handbook
Volume: 4A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v04a.a0005798
EISBN: 978-1-62708-165-8
... Abstract This article presents the different hardness test methods used to measure the effectiveness of surface carbon control in carburized parts of steel. Common test methods include Rockwell hardness measurements, superficial Rockwell 15N testing, and microhardness testing. The article...
Image
Published: 31 October 2011
Fig. 27 Cross section of a DP780 steel weld with indentations from microhardness testing. Source: Ref 23 More
Image
Published: 01 January 1990
Fig. 17 Hardness versus depth for surface-hardened pearlitic malleable irons. Curves labeled “Matrix” show hardness of the matrix, converted from microhardness tests. O, oil quenched and tempered to 207 HB before surface hardening; A, air cooled and tempered to 207 HB before surface hardening More
Image
Published: 01 December 2008
Fig. 20 Hardness versus depth for surface-hardened pearlitic malleable irons. Curves labeled “Matrix” show hardness of the matrix, converted from microhardness tests. O, oil-quenched and tempered to 207 HB before surface hardening; A, air-cooled and tempered to 207 HB before surface hardening More
Image
Published: 31 August 2017
Fig. 13 Hardness versus depth for surface-hardened pearlitic malleable irons. Curves labeled “Matrix” show hardness of the matrix, converted from microhardness tests. O, oil quenched and tempered to 207 HB before surface hardening; A, air cooled and tempered to 207 HB before surface hardening More
Image
Published: 31 August 2017
Fig. 20 Hardness versus depth for surface-hardened pearlitic malleable irons. Curves labeled “Matrix” show hardness of the matrix, converted from microhardness tests. O, oil-quenched and tempered to 207 HB before surface hardening; A, air-cooled and tempered to 207 HB before surface hardening More
Image
Published: 01 October 2014
Fig. 2 Microhardness profile of 16 mm (0.63 in.) test bar of 8620 steel after gas carburization at 925 °C (1700 °F). Source: Ref 12 More
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003275
EISBN: 978-1-62708-176-4
..., such as pressure, speed, angle of contact, and surface roughness, influence the results of the test. Consequently, its ability to give reproducible hardness values is rather limited, and reasonable accuracy is obtained only at the highest hardness levels. Ultrasonic Microhardness Testing Ultrasonic...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001237
EISBN: 978-1-62708-170-2
... any significant changes in the material microstructure. Microhardness Testing Microhardness testing is a useful tool for the microstructural analysis of a finished surface. Information such as phase identification and fracture toughness data can be determined. Hardness is defined...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001343
EISBN: 978-1-62708-173-3
... are tension tests (transverse and all-weld-metal), Charpy impact tests, fracture toughness tests, and a microhardness traverse. A transverse tensile test is primarily used to ensure that the welded joint is not the weak link in the final structure. In this case, a 305 × 32 mm (12.0 × 1.25 in.) specimen...
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
... Superficial hardness E384 Microhardness E1920 Metallographic preparation E2109 Microstructural evaluation G59 Microstructural evaluation G106 Microstructural evaluation B117 Microstructural evaluation Hardness Testing Hardness measurement of thermal spray coatings...
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
..., and conventional microhardness testers, the surface being tested should be at least within 2 or 3° of flatness—that is, close to 90° of the direction of travel of the indenter. For example, when odd-shaped workpieces do not have any surfaces parallel to the surface to be tested, it is often possible to provide...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005605
EISBN: 978-1-62708-174-0
.... These methods include peel testing, push-pin testing, and microhardness/nanohardness testing. The article also reviews the issues to be addressed in maintaining UAM fabrication quality. fabrication quality machining mechanical properties metal tape metallurgical properties microhardness testing...
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005863
EISBN: 978-1-62708-167-2
... and power for induction hardening, and describes common methods for measuring case depth, such as optical and microhardness, and surface hardness. It provides information on some complications and ambiguities associated with these measurements. The article also discusses the commonly used non-destructive...
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
... (a) (a) (a) (a) (a) (a) (a) (a) 20 (a) 20 22 These values are approximate only and are intended primarily as a guide: see test for example of use. Materials thinner than shown may be tested on a Tukon microhardness tester. The thickness of the workpiece should be at least 1 1 2 times the diagonal...
Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.a0009000
EISBN: 978-1-62708-186-3
... surfaces using a microhardness tester Figure 2 illustrates the sheet metal samples after drawing in the wear tests, where the sheet metal is HD-GA dual-phase (DP) 500 (DP500) without any stamping lubricant. Figure 3 depicts the dies and draw beads used in the wear tests. Figure 4 shows the 3-D...
Image
Published: 31 December 2017
Fig. 18 Microhardness profiles in eroded samples for three different metallic alloys: aluminum alloy 7075, nickel-aluminum-bronze alloy C95400, and duplex stainless steel A2205. Mass loss tests were conducted in the LEGI cavitation erosion tunnel ( Fig. 9 ). Upstream pressure 40 bar More
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