Q
Secondary hardening in steels arises out of the _____________________?
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A
A. Precipitation of fine alloy carbides at high temperatures
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B
B. Refinement of ferrite grain size by working
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C
C. Decomposition of retained austenite upon heat treatment
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D
D. Precipitation of complex inter-metallic upon heat treatment
Correct Answer:
C. C. Decomposition of retained austenite upon heat treatment
