A new high-throughput method using additive manufacturing for alloy design and heat treatment optimization

TL;DR

This paper introduces a high-throughput additive manufacturing method that accelerates alloy post-heat treatment optimization by using a gradient temperature zone, enabling efficient phase transformation studies and alloy performance enhancement.

Contribution

The authors developed a novel gradient temperature zone approach for rapid post-heat treatment testing in AM alloys, improving efficiency in phase transformation and alloy development.

Findings

Precipitation strengthening is dominant in the studied superalloy.

Grain size is insensitive to temperature between 605°C and 825°C.

The method effectively determines optimal aging temperatures.

Abstract

Many alloys made by Additive Manufacturing (AM) require careful design of post-heat treatment as an indispensable step of microstructure engineering to further enhance the performance. We developed a high-throughput approach by fabricating a long-bar sample heat-treated under a monitored gradient temperature zone for phase transformation study to accelerate the post-heat treatment development of AM alloys. This approach has been proven efficient in determining the aging temperature with peak hardness. We observed that the precipitation strengthening is predominant for the studied superalloy by laser powder bed fusion, and the grain size variation is insensitive on temperature between 605 and 825 Celcius. This new approach can be applied to post-heat treatment optimization of other materials made by AM, and further assist new alloy development.