Please help im lost.. Briefly explain: (a) why the presence of alloying elements

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Please help im lost..

Briefly explain: (a) why the presence of alloying elements other than carbon can improve the hardenability of the alloy; and (b) why a reduction in the austenite grain size will decrease the hardenability of the alloy. Case hardening is a technique whereby both surface hardness and fatigue life are enhanced for steel alloys. Explain why these two properties can be improved by case hardening. Cu-rich Cu-Sn alloys are precipitation hardenable. After consulting the binary phase diagram shown below, do the following: Specify the range of compositions over which these alloys may be precipitation hardened. Determine the composition (in both wt.% and at.%) of the second phase that can harden the alloy Briefly describe the heat-treatment procedures (in terms of temperatures) that would be used to precipitation harden an alloy having a composition that lies in the middle of the range given for Part (a). Phase Diagram of the Sn-Cu System

Explanation / Answer

The improvement of fatigue properties results from inceaesed hardness within the case as wellas the desired residual compressive stress , the formation of of whch attends the carburizing or nitriding process.


During carburisation, the component is heated in a carbon-releasing medium to a temperature where the steel is completely austenitic. Carbon

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