The characterisation of work-hardened austenitic stainless steel by NDT micro-magnetic techniques

D. O'Sullivan, M. Cotterell, I. Mészáros

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

It is accepted that the work-hardening of austenitic stainless steels during machining or cold-working results in two main products: the appearance of α′-martensite and increased dislocation densities within the host material. In machining, this results in many difficulties (poor surface finish, poor machinability and high tool wear). Non-destructive sensing is essential in today's high volume production environments because of its ease of use, speed and non-invasive sensing. Non-destructive magnetic measurement techniques have been employed to characterise the work-hardening of an austenitic stainless steel grade (SS404) due to room-temperature plastic tensile loading. These techniques include the use of magnetic Barkhausen noise, ferromagnetic phase measurement and coercivity measurement. It was found that the dislocation density, rather than the α′-martensite phase, to be the cause of material work-hardening. It is suggested that the use of coercivity measurement is a useful quantitative and non-destructive method for characterising work-hardening of the studied alloy in relation to the amount of its plastic deformation (work-hardening).

Original languageEnglish
Pages (from-to)265-269
Number of pages5
JournalNDT and E International
Volume37
Issue number4
DOIs
Publication statusPublished - Jun 2004

Fingerprint

work hardening
austenitic stainless steels
Austenitic stainless steel
Nondestructive examination
Strain hardening
Coercive force
martensite
Martensite
machining
coercivity
Machining
cold working
Cold working
Machinability
Phase measurement
Magnetic variables measurement
plastic deformation
magnetic measurement
grade
Plastic deformation

Keywords

  • Coercivity
  • Magnetic Barkhausen noise
  • Work-hardening

ASJC Scopus subject areas

  • Engineering(all)
  • Mechanical Engineering

Cite this

The characterisation of work-hardened austenitic stainless steel by NDT micro-magnetic techniques. / O'Sullivan, D.; Cotterell, M.; Mészáros, I.

In: NDT and E International, Vol. 37, No. 4, 06.2004, p. 265-269.

Research output: Contribution to journalArticle

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