Metallurgical Engineering

Metallurgical Engineering

The effect of hot Isostatic pressing on microstructure and mechanical properties of nickel based gas turbine blade

Document Type : Research Paper

Author
Ali Mohammad Kolagar
MSc., Material Science and Engineering, Iran University science & Technology, MavadKaran Engineering Company, Mapna Group
10.22076/me.2018.69675.1148
Abstract
Solidification microporosity forms within dendritic space of gas turbine blades at large section in investment casting. Microporosity content more than permissible limit significantly reduces mechanical properties of turbine blades at the service conditions. In these work effects of Hot Isostatic pressing (HIP) followed by standard heat treatment cycle process on microstructural characteristics such as grain boundaries serration, microporosity content and mechanical properties of Ni-base superalloy IN738LC have been investigated by optical, Scanning Electron Microscopy (SEM) and practical experiments. The results of studies have shown that hot isostatic pressing provides more serration at grain boundary and could mostly eliminate or reduce microporosity, was generated during solidification by means of sintering. HIP is able also to improve creep life and ductility but has no effect on yield stress at tensile experiment.

Key Words: Hot Isostatic pressing, Ni-base superalloy, Solidification microporosity, mechanical properties

Key Words: Hot Isostatic pressing, Ni-base superalloy, Solidification microporosity, mechanical properties
Keywords
Hot Isostatic pressing
Ni-base superalloy
Solidification microporosity
Mechanical properties
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  • Receive Date 14 September 2017
  • Revise Date 13 December 2017
  • Accept Date 10 January 2018