Microstructure and Mechanical Properties of Functionally Graded Transition Joints

In this section

Back to Core Research Programme AMorph – 4D Printing for Field Morphing Structures Automation of Composite and Hybrid Joining Process Coaxial Wire Additive Manufacturing Processes and In-Line Monitoring Tools Development of Coded Excitation Technique for Non-Metallic Pipes Inspection Development of Digital Twin technology as a demonstrator for real-time integrity assessment of crack growth in tensile specimens Development of Friction Stir Welding (FSW) for Hydrogen Fuel Storage Tanks Development of Leak-Before-Break Hydrogen Storage Composite Pressure Vessels With Polymeric Liner Establishing Assessment Methods for Determining Safe Service Limits of High-Temperature Materials in Extreme Environments Fracture toughness in aggressive environments: effect of crack monitoring techniques on test results In-process detection and non-destructive testing of electron beam weld imperfections Internal Bore Coatings for Applications in Corrosion and Hydrogen Environment Joining of Additively Manufactured Materials Long term behaviour of polymeric liner materials/coatings in hydrogen service Techniques for High Temperature Ultrasonic Inspection of Arc Welding Ultimate Leverage Fund

Project Code: 36200

Start date and planned duration: February 2025, 18 months

Objective

To produce a state of the art literature survey for TWI industrial members regarding AM of FGTJs.
To develop procedures for systematic evaluation of mechanical properties of AMed FGTJs.
To establish processing-microstructure-properties relationships for AM of FGTJs.

Project Outline

This research aims to investigate the microstructure and mechanical properties of functionally-graded transition joints (FGTJs) fabricated using wire arc additive manufacturing (WAAM). Despite TWI’s extensive experience in dissimilar welding of wrought components, there is a lack of equivalent knowledge for AM-produced graded materials, especially in the context of industrial applications. With recent developments in capability, TWI can now fabricate high-quality AM builds of a variety of FGTJs, opening new opportunities for joining of dissimilar materials.

The proposed core research programme (CRP) project will focus on microstructural characterisation and mechanical properties of functionally-graded joints between 316L austenitic stainless steel and ASTM A508 Gr.22 low alloy steel to establish the processing-microstructure-properties relationships. The study will contribute to advancing innovative solutions to produce high-performance FGTJs.

Industry Sectors

- Aerospace

->Energy

-Manufacturing

Benefits to Industry

Functionally-graded transition joints are a disruptive technology that address thermal expansion, mechanical strength, and corrosion issues in joining dissimilar metals.