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1. (WO2012146254) METHOD FOR SOLUTION HARDENING OF A COLD DEFORMED WORKPIECE OF A PASSIVE ALLOY, AND A MEMBER SOLUTION HARDENED BY THE METHOD

Pub. No.:    WO/2012/146254    International Application No.:    PCT/DK2012/050139
Publication Date: Fri Nov 02 00:59:59 CET 2012 International Filing Date: Sat Apr 28 01:59:59 CEST 2012
IPC: C23C 8/26
C23C 8/34
Applicants: EXPANITE A/S
CHRISTIANSEN, Thomas Lundin
HUMMELSHOJ, Thomas Strabo
SOMERS, Marcel A.J.
Inventors: CHRISTIANSEN, Thomas Lundin
HUMMELSHOJ, Thomas Strabo
SOMERS, Marcel A.J.
Title: METHOD FOR SOLUTION HARDENING OF A COLD DEFORMED WORKPIECE OF A PASSIVE ALLOY, AND A MEMBER SOLUTION HARDENED BY THE METHOD
Abstract:
The invention relates to a method for method for formation of expanded austenite and/or expanded martensite by solution hardening of a cold deformed workpiece of a passive alloy, which method comprises a first step of dissolving at least nitrogen in the workpiece at a temperature T1, which is higher than the solubility temperature for carbide and/or nitride and lower than the melting point of the passive alloy, and a subsequent second step of dissolving nitrogen and/or carbon in the work piece at a temperature T2, which is lower than the temperature at which carbides and/or nitrides form in the passive alloy. The invention further relates to a member, such as a lock washer for securing bolts or nuts prepared using the method.