Mechanical response and dislocation substructure of high strength Ni-Cr-Mo steel subjected to impact loading

W. S. Lee, H. F. Lam

Research output: Contribution to journalConference article

2 Citations (Scopus)

Abstract

This work focuses on investigating the mechanical response of high strength Ni-Cr-Mo steel (AISI 4340) subject to impact loading, and the relation between its properties and its dislocation substructure. The material was quenched (900°C/30 min.) in oil and then tempered at 550°C for 2 hours to obtain a better tempering martensite structure. The high-strain-rate properties are determined by a series of standard split Hopkinson compression tests at strain rate ranging from 102s-1 to 5 × 104s-1. The influences of the strain rate on the stress-strain characteristics, work hardening and deformation mechanisms are discussed. Parallel with this work, the deformed specimens are studied with transmission electron microscopy techniques to observe the development of a cell structure and measure the dislocation density and cell size. The relationships between dislocation density, flow stress, and strain rate have been described in terms of the dislocation structure observed.

Original languageEnglish
Pages (from-to)307-312
Number of pages6
JournalJournal De Physique. IV : JP
Volume4
Issue number8
DOIs
Publication statusPublished - 1994
EventProceedings of the International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading - Oxford, UK
Duration: 1994 Sep 261994 Sep 30

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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