ENGR 240 - 10.10.07

ENGR 240 - 10.10.07 - ENGR 240 October 10, 2007 Force of...

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ENGR 240 – October 10, 2007 Indentation hardness testing o use the cross-sectional dimensions to get depth of indentation o there are several hardness scales be careful about comparing hardness from different scales Types of Hardness Scales o Brinell (HB) Used on big components Large loads and large indenters are needed ~load = 3000kg ~indenter = 10 mm ball material must be well-defined (smooth, flat surface) o Rockwell (HR) Most common Quick and easy Many different subset hardness scales Must consider a combination of load and indenter o Types of indenters Conical diamond Hardened steel spheres of various diameter Requires a smooth flat surface o Vickers (HV) One scale (like Brinell) Used with light loads/small dents 1-1000g uses a pyramidal diamond indenter good for small samples and specific areas of materials welds, surface coatings o Knoop (HK) “microhardness” similar in load and indenter to Vickers Scale
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ENGR 240 - 10.10.07 - ENGR 240 October 10, 2007 Force of...

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