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8th Edition of

International Conference on Materials Science and Engineering

March 10-12, 2025 | Rome, Italy

Materials 2022

Jared Foo

Speaker at Materials Science and Engineering 2022 - Jared Foo
Rolls-royce Singapore Pte Ltd, Singapore
Title : A Case Study of Austenitic Stainless Steel Air Tube Fracture from an Aircraft Gas Turbine Engine


An air tube made of austenitic stainless steel (grade 347) that belonged to an aircraft gas turbine engine was found to have fractured. The fracture was found along the edge of a circumferential weld (HAZ) between the flange and the tube. Fractographic examination revealed that one half of the fracture surface was due to intergranular cracking, whereas the other half was predominantly transgranular cracking. The transgranular fracture was a result of High Cycle Fatigue (HCF) mode of propagation which had originated from the intergranular fracture zone. Metallographic examination across the fracture confirmed that the material had been sensitised which was considered to be caused by prolong exposure of the tube material to high temperature air in the range of 500ºC to 900ºC. The evidence suggested that the intergranular cracks was initiated due to sensitisation which was likely to have weakened the material sufficiently to allow a HCF failure mode to occur and resulted in the final failure of the tube.

What will audience learn from your presentation?

The presentation is a case study that describes a problem encountered in an aircraft gas turbine engine. It explains the materials characterization techniques and methodologies commonly used in the aerospace industry to determine the root cause of the failure. With the root causes identified, steps can be taken, for example by improving the design of the product and/or reviewing of in-service conditions to prevent similar failure occurrence.


Mr Jared Foo has a degree in Materials Engineering and MSc in Mechanical and Materials Processing from Nanyang Technology University (NTU). Jared has fifteen years of experience in the area of materials failure investigation, testing and characterization. He started the first few years of his career as Materials engineer in commercial laboratories serving the marine, oil and gas, construction and transportation sectors. He joined Rolls-Royce in 2010 as a Failure Investigator, with the last five years as team leader, focusing on in-service aircraft gas turbine engines in the Asia Pacific Region. Jared is a member of the Institute of Materials, Minerals and Mining.