Transactions of Materials and Heat Treatment

Title：Study on hot deformation behavior and microstructure characteristics of extruded Ni-base powder metallurgy superalloy

Authors： Wang Chaoyuan Dong Yunpeng Wang Shuyun Song Xiaojun

Unit： Beijing Institute of Aeronautical Materials

KeyWords： Ni-base P/M superalloy hot compression deformation constitutive equation microstructure

ClassificationCode：

year,vol(issue):pagenumber：2014,39(4):126-132

Abstract：

Hot deformation behavior and microstructure characteristics of extruded Ni-base P/M superalloy under constant temperature and strain rate were studied using isothermal compression tests. The compression tests were conducted at 950-1150 ℃ with the strain rate of 0.001-0.5 s-1 on Gleeble-3500D simulator. By regression analysis, the constitutive equation for Ni-base P/M superalloy was developed with hot activation energy of 338.638 kJ·mol-1. The Ni-base P/M superalloy specimens compressed below 1050 ℃ were more likely to crack than that compressed between 1050-1150 ℃.Full dynamical recrystallization occured in all specimens after hot compression deformation, and the recrystallization grain size was significantly affected by temperature.When specimens deformed，with the increasing of temperature，the grain size increased slightly below 1100 ℃, while the grain size increased rapidly above 1100 ℃.The appropriate hot deformation process parameters were strain rate of 0.001-0.01 s-1 and temperature between 1050 and 1100 ℃。

Funds：

王超渊（1986-），男，硕士，助理工程师

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