Secondary hardening in steels arises out of the _____________________?

Secondary hardening in steels arises out of the _____________________?

(A) Precipitation of fine alloy carbides at high temperatures

(B) Refinement of ferrite grain size by working

(C) Decomposition of retained austenite upon heat treatment

(D) Precipitation of complex inter-metallic upon heat treatment

Submitted By :Ali Uppal

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