Martensitic transformation and physical properties of 'steel-TiNi' bimetal composite, produced by explosion welding

• Published in: Phase transitions Vol. 83; no. 4; pp. 276 - 283
• Main Authors: Belyaev, S., Rubanik, V., Resnina, N., Rubanik, O., Borisov, V.
• Format: Journal Article
• Language: English
• Published: Abingdon Taylor & Francis Group 01-04-2010; Taylor & Francis Ltd
• Subjects: Annealing; explosion welding; Explosive welding; Intermetallics; Intervals; Kinetics; martensitic transformation; micro-hardness; Nickel base alloys; Nickel compounds; Nickel titanides; Phase transitions; Shape memory alloys; Stainless steel; Temperature; TiNi shape memory alloy; Titanium compounds
• ISSN: 0141-1594; 1029-0338
• DOI: 10.1080/01411591003656757

The aim of this work is an investigation of structure and martensitic transformation in bimetal composite 'TiNi-stainless steel' produced by explosion welding. The results have shown that the mixture of chemical elements is observed in very narrow intervals of 6 µm close to the joint - 2 µm from the TiNi side and 4 µm from the steel one. Micro-hardness distribution in the vicinity of the joint is non-monotonic in the interval of 60 µm. Connection of stainless steel and TiNi plates by explosion welding leads to a dramatic change of martensitic transformation kinetics. Temperatures and the temperature interval of phase transformation increase strongly and heat transformation decreases. Annealing at 500°C for 2 h of bimetal composite decreases the interval of micro-hardness variation and partially recovers kinetics of phase transitions.