Effect by Heat Treatment on Microstructure and Tensile Property of 15-15Ti Stainless Steel Cladding Tube

Studied here in the article are the effects by the heat treatment temperature and the holding duration on the microstructure and the tensile property of the 15-15Ti cladding tube. As a result the facts as follows are revealed. The grain size of the 15-15Ti stainless steel is getting larger and larger along with the rising of the heat treatment temperature and the extending of the holding duration;in case of the holding duration as 5~60 min,the grain enlargement apparent activation energy is 419.03~502.17 kJ/mol;the relation between the average grain size and the holding duration is the parabolic relation,and following the rising of the temperature,the changing trend of the dynamic time exponential η is remaining the same firstly,and then getting increased;under different holding durations,the tensile strength changes as following the temperature and holding duration with a same trend basically,while gets decreased gradually along with rising of the temperature and extending of the holding duration;and under different heat treatment conditions,relation between the specified plasticity elongation strength and the average grain size is in compliance with the Hall-Petch relation.