Metallurgical Engineering

Metallurgical Engineering

effect of pouring temperature on micro structure and hot tensile on Nickle-Iron base super alloy

Document Type : Research Paper

Authors
Alireza Mirak 1
mahsa ghodsi 2
1 Material Research and Manufacturing Technology, MUT University.
2 M.Sc. Student, Faculty of Engineering & High-Technology, Iran University of Industries & Mines,
10.22076/me.2018.82384.1179
Abstract
In this research effect of pouring temprature on the microstructure charactristics and hot tensile properties of an experimental Ni-Fe based superalloy N-155 has been investigated. the the melt was made in induction furnece by vacuum melting . All samples were poured in the preheated ceramic mould in different pouring temprature include of 1420, 1460, 1500, 1540 and 1580 °C and cooled down to room temprature in insolated conditions. The microstructure charactristics was analised by SEM and EDS tecniques. The hot mechanical properties was caried out in 816°C for each casting condition. The results show that the main microstructure consist of austenite as only dominate phase and the secand perciptation phase concist of MCN carbunitride as shown in continuse films precipteted in a long of grain boundries. A fine equiaxed / cellural structure can be shown in pouring temprature less than 1460°C due to initial dissolved carbids. The microstructure was modified to coarse dendritic structure inlongated in heat transpher direction at higher pouring temprature around of 1500 °C. The SE images showed that the carbides morphology are blocy and short script-like in matrix respectivly was preciptated in lower superheat while in higher temprature that change to the thin and non-continouse films which preciptated around of grains boundries. The hot UTS strength reached to 310 Mpa in 1500 °C due to modified structure and reduced to 245 Mpa because of enlarged grains and also elongation increases as pouring temprature rises.
Keywords
Ni-Fe base super alloy
pouring temperature
Microstructure
hot mechanical properties
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  • Receive Date 10 March 2018
  • Revise Date 10 November 2018
  • Accept Date 10 September 2018