Hardness Test

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Hardness conversion relationships • Hardness conversions are empirical relationships for Brinell, Rockwell and Vickers hardness values. • This hardness conversions are applicable to heat-treated carbon and alloy steels in many heat treatment conditions. (or alloys with similar elastic moduli). • For soft metals, indentation of hardness depends on the strain hardening behaviour of the materials. • Special hardness-conversion tables for cold-worked aluminium, copper, and 18-8 stainless steel are given in the ASM Metals Handbook. Suranaree University of Technology May-Aug 2007 Tapany Udomphol
Hardness at elevated temperatures • Hot hardness gives a good indication of potential usefulness of an alloy for high-temperature strength applications. • Hot hardness testers use a Vickers indenter made of sapphire and with provisions for testing in either vacuum or an inert atmosphere. • The temperature dependence of hardness could be expressed as follows; H = Ae −BT Eq.10 Where H = hardness, kgf.mm -2 T = test temperature, K A,B = constants Suranaree University of Technology May-Aug 2007 Tapany Udomphol
Page 1 and 2: Hardness Test Subjects of interest
Page 3 and 4: Introduction Definition Hardness is
Page 5 and 6: Introductions • Hardness tests ca
Page 7 and 8: Advantages and disadvantages of Bri
Page 9 and 10: Meyer hardness • Meyer suggested
Page 11 and 12: Vickers hardness • Vickers hardne
Page 13 and 14: Vickers hardness values of material
Page 15 and 16: Rockwell hardness test Principal of
Page 17 and 18: Rockwell hardness instruction • C
Page 19 and 20: Plastic zone underneath an indenter
Page 21: Relationship between hardness and t
Page 25: References • Dieter, G.E., Mechan

Hardness Test

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