Chemical Engineering Basics
Cold cracking in the heat affected zone of a high strength steel weld can take place because of the

Retained austenite
Martensite formation
Relatively high sulphur content in the base metal
Sufficient hydrogen present in the welding arc

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Chemical Engineering Basics
Maraging steels derive their strength from the following mechanism:

Fine dispersions of Fe₃ C nucleated on dislocations in austenite
A fine, highly dislocated and strong martensite
Fine dispersions of intermetallics of Fe, Ni, Ti etc
Fine dispersions of alloy carbides in a ferrite matrix

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