Effect by Heat Treatment on Microstructure and Hardness of GH2747 Alloy Seamless Tube

Analyzed here in the paper is the effect by the heat treatment temperature and holding duration on microstructure and hardness of the cold-rolled GH2747 alloy seamless tube. As a result it is revealed that the grain size of the GH2747 alloy is enlarged along with rising up of the heat treatment temperature and extension of the holding duration;the apparent activation energy for the grain enlargement of the alloy is 234.9 kJ/mol;that the said grain size enlargement as per the holding duration is in compliance with the Baker Formula,and the dynamic time index η shows a trend of being invariable at first,and then decreasing along with the increase of the temperature;and the Vickers hardness HV and average grain size of the GH2747 alloy under the condition of different heat treatment process parameters are in accordance with the Hall-Petch Relationship.