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The following alloys 8660,8640,4140,4340 and 5140. A substance that combines more than one metal or mixes a metal with other non-metallic elements is known as a metal alloy.
A cylindrical piece of steel is to be quenched in moderately agitated water. Surface and center hardnesses must be at least:
[tex]H_{sur}=50[/tex] HRC
[tex]H_{c}[/tex]=40HRC
D=50 mm
Given alloys: 1040, 5140, 4340, 4140, 8620, 8630, 8640, and 8660.
Cylindrical bars are quenched in mildly agitated water:
8660,8640,4140,4340 and 5140 qualifies because its center hardness is above 40 HRC and surface harness is above 50HRC.
A chemical element mixture called an alloy must contain at least one metal. The properties of a metal, such as electrical conductivity, ductility, opacity, and lustre, will all be retained in the alloy's final product, unlike chemical compounds with metallic bases, but an alloy may also have additional properties that aren't present in pure metals, such as increased strength or hardness. In some circumstances, an alloy may keep vital qualities while lowering the material's overall cost. In other instances, the mixture endows the constituent metal elements with synergistic qualities like corrosion resistance or mechanical strength.
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