No Cover Image

Journal article 1042 views 100 downloads

Microstructure evolution in flow formed IN 718 products and subsequent fatigue crack growth properties

Martin Bache, Costa Coleman, Mark Coleman Orcid Logo, Veronica Gray, C. Boettcher

Fatigue & Fracture of Engineering Materials & Structures, Volume: 41, Issue: 11, Pages: 2249 - 2258

Swansea University Authors: Martin Bache, Costa Coleman, Mark Coleman Orcid Logo, Veronica Gray

  • bache2018.pdf

    PDF | Version of Record

    This is an open access article under the terms of the Creative Commons Attribution License.

    Download (2.08MB)

Check full text

DOI (Published version): 10.1111/ffe.12814

Abstract

With the drive towards cost‐effective routes for the manufacture of engineering components, flow forming technologies are now under consideration for the production of structural axisymmetric geometries such as tubes and cones. This near net shape process is known to offer improvements in material u...

Full description

Published in: Fatigue & Fracture of Engineering Materials & Structures
ISSN: 8756-758X
Published: 2018
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa40092
Tags: Add Tag
No Tags, Be the first to tag this record!
Abstract: With the drive towards cost‐effective routes for the manufacture of engineering components, flow forming technologies are now under consideration for the production of structural axisymmetric geometries such as tubes and cones. This near net shape process is known to offer improvements in material utilisation when compared with traditional processes where substantial final machining is required. The microstructure, evolved as a result of the flow forming process together with subsequent heat treatments, will govern associated mechanical properties. Laboratory measurements of the structure‐property relationships of flow formed material can be problematic, mainly because of the restrictions imposed on the extraction of conventional specimen geometries since most of the finished tubular or cone structures will contain thin and curved walls. The development of a suitable specimen design and associated test technique for the measurement of fatigue crack growth rates at room and elevated temperatures is presented. Data obtained from flow formed Inconel 718 (IN 718) will be compared with specimens of the exact same geometry but machined from conventionally forged IN 718 stock. This allowed for validation of the novel flow formed test in addition to an assessment of the damage tolerance of the flow formed variant. The intimate relationship between local microstructure and fracture mechanisms will be described.
Keywords: crack propagation, nickel‐based alloys, test development, manufacturing
College: Faculty of Science and Engineering
Issue: 11
Start Page: 2249
End Page: 2258