How hardness and microstructure determine abrasive resistant?

During my career, a lot of my customers put hardness as priority condition to value the abrasive resistant characteristics of wear plate.
 Here i hope to declare some points with you as below:
* High hardness does not mean good wear resistance;
* The materials microstructure and not its hardness determines abrasive resistance wear characteristics;
* Chemical composition, microstructure & bulk hardness influence abrasion resistance;
* Abrasion resistance is not apparent in a hardness test but in a actual wear test such as ASTM G65.


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