EP 0297004 B1 19910508 - USE OF A PROCESS FOR IMPROVING THE DUCTILITY OF A PRODUCT MADE FROM A MARTENSITIC TRANSFORMATION ALLOY
Title (en)
USE OF A PROCESS FOR IMPROVING THE DUCTILITY OF A PRODUCT MADE FROM A MARTENSITIC TRANSFORMATION ALLOY
Publication
Application
Priority
FR 8709272 A 19870624
Abstract (en)
[origin: US4878954A] A process is disclosed for improving the ductility of shape-memory alloy products based on Ti-Ni involving martensitic transformation. The process comprises at least one thermal treatment cycle of alternating hot and cold treatment, wherein the first thermal treatment cycle comprises a cold treatment at a temperature both lower than -50 DEG C. and lower than Ms-50 DEG C., where Ms is the temperature at which martensitic transformation of the product begins, and a hot treatment of the product at a temperature of 700 DEG to 900 DEG C. Each optional subsequent thermal treatment cycle comprises a cold treatment of the product at a temperature both lower than -50 DEG C. and lower than Ms-30 DEG C., and a hot treatment of the product at a temperature of 600 DEG to 900 DEG C.
IPC 1-7
IPC 8 full level
C21D 6/00 (2006.01); C21D 8/00 (2006.01); C22F 1/00 (2006.01); C22F 1/08 (2006.01); C22F 1/10 (2006.01)
CPC (source: EP US)
C22F 1/006 (2013.01 - EP US)
Designated contracting state (EPC)
BE CH DE FR GB IT LI NL
DOCDB simple family (publication)
EP 0297004 A2 19881228; EP 0297004 A3 19890628; EP 0297004 B1 19910508; DE 3862691 D1 19910613; FR 2617187 A1 19881230; FR 2617187 B1 19891020; JP H036986 B2 19910131; JP S6421042 A 19890124; US 4878954 A 19891107
DOCDB simple family (application)
EP 88420216 A 19880622; DE 3862691 T 19880622; FR 8709272 A 19870624; JP 15454088 A 19880622; US 20803588 A 19880617