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Rather, they increase the bulk hardness of the cast iron simply by virtue of their own very high hardness and their substantial volume fraction, such that the bulk hardness can be approximated by a rule of mixtures. In any case, they offer hardness at the expense of toughness.
The Rockwell hardness test is a hardness test based on indentation hardness of a material. The Rockwell test measures the depth of penetration of an indenter under a large load (major load) compared to the penetration made by a preload (minor load). [ 1 ]
Bulk moduli was the first major test of hardness and originally shown to be correlated with the molar volume (V m) and cohesive energy (E c) as B ~ E c /V m. Bulk modulus was believed to be a direct measure of a material's hardness but this no longer remains the dominant school of thought.
The primary phase of low-carbon or mild steel and most cast irons at room temperature is ferromagnetic α-Fe. [8] [9] It has a hardness of approximately 80 Brinell. [10] [11] The maximum solubility of carbon is about 0.02 wt% at 727 °C (1,341 °F) and 0.001% at 0 °C (32 °F). [12] When it dissolves in iron, carbon atoms occupy interstitial ...
Bulk modulus : 170 GPa : Speed of ... increase in the hardness and tensile strength of iron. Maximum hardness of 65 R c is achieved ... of a white cast iron is full ...
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Brittleness: Ability of a material to break or shatter without significant deformation when under stress; opposite of plasticity, examples: glass, concrete, cast iron, ceramics etc. Bulk modulus: Ratio of pressure to volumetric compression (GPa) or ratio of the infinitesimal pressure increase to the resulting relative decrease of the volume
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