Martensitic transformation and physical properties of ‘steel–TiNi’ bimetal composite,produced by explosion welding |
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| Authors: | S Belyaev V Rubanik V Rubanik Jr O Rubanik V Borisov |
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| Institution: | 1. Faculty of Mathematics and Mechanics , Institute of Mathematics and Mechanics, Saint Petersburg State University , Saint Petersburg, Russia;2. Department of Physics , Vitebsk State Technological University , Vitebsk, Belarus |
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| Abstract: | 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. |
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| Keywords: | martensitic transformation explosion welding micro-hardness TiNi shape memory alloy |
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