Effect of Turning Amount on Metallurgical Qualities and Mechanical Properties of GH4169 Superalloy.

Jinglong Qu,Shufeng Yang,Jingshe Li,Zhengyang Chen,Jinhui Du,Di Wang

doi:10.3390/ma12111852

Abstract

The determination of an appropriate amount of turning for superalloy ingot surfaces, in a scientific and reasonable manner, is vital to the improvement of the metallurgical quality and comprehensive performance of superalloy ingots. In the present study, scanning electron microscopy with energy-dispersive spectroscopy, a high-temperature testing machine, a Brinell hardness tester and the Image-Pro Plus software were used to analyze and compare the types and amounts of inclusions, the average area of the (Al,Mg)O inclusions, and the mechanical properties of points at different distances from the edge of the GH4169 superalloy vacuum arc remelting (VAR) ingot edge. The effects of the amount of turning to which the superalloy is subjected, the metallurgical qualities, and the mechanical properties were systematically studied. The results showed that the five inclusion types did not change as the sampling locations moved away from the ingot edge, but the amount of inclusions and the average area of the (Al,Mg)O inclusions first decreased and then stabilized. Similarly, the tensile strength, elongation, section shrinkage, hardness, and fatigue life first increased and then stabilized. Finally, this experiment tentatively determined that an appropriate amount of turning for a GH4169 superalloy ingot is 36–48 mm.

Highlights

GH4169 superalloy exhibits excellent resistance to oxidation, corrosion, and fatigue, while exhibiting good plasticity and a tensile strength in the range of ~253–650 ◦ C [1,2,3]
Steel mills rely on operational experience or an ingot’s surface finish as the standard for measuring the turning quality of a vacuum arc remelting (VAR) ingot, ignoring the slag discharge effect of the VAR process [17,18,19]
The inclusions were characterized by scanning electron microscopy (SEM) equipped with energy dispersive spectroscopy (EDS) module Phenom ProX

Summary

Introduction

GH4169 superalloy exhibits excellent resistance to oxidation, corrosion, and fatigue, while exhibiting good plasticity and a tensile strength in the range of ~253–650 ◦ C [1,2,3] It is ideal for the manufacture of a variety of complex parts. As aircraft engines have become safer, more economical, and lighter, it has gradually been determined that differences in the surface qualities of superalloy parts will seriously affect their overall mechanical properties. This poses a significant threat to the safety and stability of the alloy while in service [7,8,9].

Methods

Results

Conclusion