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Describe the following two surface hardening processes and explain why they might be used on the journal surfaces and fillets in order to extend the

Describe the following two surface hardening processes and explain why they might be used on the journal surfaces and fillets in order to extend the lifetime of the crankshaft. Include an explanation of the changes in microstructure that would occur in each case.

(i) Induction hardening. [5 marks]

(ii) Nitridation.

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