Process for producing crack-free nitride-hardened surface on tit

Details Process for producing crack-free nitride-hardened surface on tit Process for producing crack-free nitride-hardened surface on tit

1992-02-28

1994-03-01

Roy, Upendra

Metal treatment

Process of modifying or maintaining internal physical...

Carburizing or nitriding using externally supplied carbon or...

148525, 427554, 427596, 437190, C22C 1400

Patent

active

052903680

ABSTRACT:
A process for producing a crack-free, laser nitride-hardened layer on a titanium substrate, the process including preheating the substrate, melting a small area of substrate with a laser, and shrouding the melted area with a gas mixture having a maximum critical amount of nitrogen not greater than 85%. A crack-free pump shaft so hardened to Rockwell 52 C is produced.

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Akgon et al. Journ. Mat. Science 27 (1992) 1404.
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