Available online at www.sciencedirect.com ScienceDirect Materials Today: Proceedings 4 (2017) 152–156 www.materialstoday.com/proceedings 2214-7853©2017 Elsevier Ltd. All rights reserved. Selection and peer-review under responsibility of Conference Committee Members of 5th International Conference of Materials Processing and Characterization (ICMPC 2016). 5th International Conference of Materials Processing and Characterization (ICMPC 2016) Study of Effects of Temperature and Pressure in HIP Process on Mechanical Properties of Nickel-based Superalloys Amir Rezaie a , Seyed Ebrahim Vahdat a,* a Department of Engineering, Ayatollah Amoli Branch, Islamic Azad University, Amol, Iran Abstract HIP process is performed to increase fatigue and creep resistance of nickel-based superalloys. Using this process, mechanical properties, particularly creep strength, fatigue strength, and toughness, are improved by four times. Range of temperature, pressure, and time of HIP depends on alloy type and the expected properties. Thus, the proper selection of temperature, time, and pressure of HIP process is very crucial for achieving favorable properties. In this paper, the range of temperature, pressure, and time in the HIP process is specified to achieve the maximum mechanical properties for the widely used nickel-based superalloys. ©2017 Elsevier Ltd. All rights reserved. Selection and peer-review under responsibility of Conference Committee Members of 5th International Conference of Materials Processing and Characterization (ICMPC 2016). Keywords:Creep Strength, Densification, Fatigue Strength, Lifetime, Repair,Tensile strength, Toughness 1. Introduction At the final stage of producing certain products, HIP process is used as the complementary operation to improve the product properties. In this process, the product is placed in an environment with homogeneous pressure and simultaneously high temperature for a certain period. HIP process was first used in 1955 for infiltrator connection in the nuclear industry and, currently, it is used for improving casting parts [1] and producing composite ceramic/ceramic, metal/ceramic, and powder metallurgical parts [2] in order to economically manufacture the turbine parts[3]. *Corresponding author. E-mail address:e.vahdat@iauamol.ac.ir