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Chapter 9 severity Test Subjects of matter to substructure/objectives Brinell badness Meyer callousness Vickers rigorousness Rockwell insensibility Microhardness tests Relationship between hardness and the scat curve insensibility-conversion relationships Hardness at elevated temperatures Suranaree University of engine room Tapany Udomphol May-Aug 2007 Objectives This chapter provides fundamental knowledge of hardness of materials along with different methods of hardness measurements normally used. Relationships between hardness and tensile properties will be made and finally factors modify hardness of admixtures will be discussed. Suranaree University of engineer science Tapany Udomphol May-Aug 2007 Introduction Definition Hardness is a groyne to deformation. (for people who are concerned with mechanics of materials, hardness is to a greater extent likely to mean the resistance to indentation) www.i magemet.

com Deeper or larger impression Softer materials Hardness impression Suranaree University of Technology Tapany Udomphol May-Aug 2007 Introduction There are three general types of hardness measurements 1) happen up hardness The ability of material to scratch on unmatchable another classical to mineralogists, using Mohsscale 1= talc, 10 = diamond Not fit for shape up annealed copper = 3, martensite = 7. 2) choppiness hardness Major important engineering interest for metals. opposite types : Brinell, Meyer, Vickers, Rockwell hardness tests. 3) Rebound or dynamic hardn ess The indentor is dropped onto the metal! surface and the hardness is expressed as the energy of impact. Suranaree University of Technology Tapany Udomphol May-Aug 2007 Introductions Hardness tests can be used for many engineering applications to achieve the staple fiber requirement of mechanical property. For examples surface treatments where surface hardness has been ofttimes improved. Powder metallurgy...If you want to get a full essay, tell it on our website: BestEssayCheap.com

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