Briefly explain: why the presence of alloying elements other than carbon can imp

Question

Briefly explain: why the presence of alloying elements other than carbon can improve the hardenability of the alloy; and 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.percentage and at.percentage) 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). Sn Mass percentage Cu Cu 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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