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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.46  No.6 (2005)  >  pp.1301-1305

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Evaluation of Grain Boundary Effect on Strength of Fe–C Low Alloy Martensitic Steels by Nanoindentation Technique

Jinxu Li1), Takahito Ohmura2) and Kaneaki Tsuzaki2)
1) Department of Materials Physics, University of Science and Technology Beijing
2) Steel Research Center, National Institute for Materials Science

The grain boundary effect on the strength was evaluated through nanoindentation technique for Fe–0.4C–Cr–Mo steels that were produced by the ausform-tempered (AF) and conventional quench-tempered (QT) processes. A semiquantitative Hall–Petch plot was made to determine the locking parameter k for the two alloys using nanohardness, micro-Vickers hardness, and grain size. The k value for the QT sample is significantly larger than that for the AF sample and is attributed to the film-like carbides on the grain boundaries of the QT sample. The lower k value of the AF sample is one of the factors for the improved delayed fracture property in the AF compared to that of the QT sample.

nanoindentation, iron-carbon low alloy steel, tempered martensite, Hall–Petch plot, grain boundary, locking parameter, carbide

Received: January 28, 2005
Accepted: April 19, 2005 , Published online: October 18, 2005
Copyright (c) 2005 The Japan Institute of Metals



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