Evaluation of grain boundary effect on strength of Fe-C low alloy martensitic steels by nanoindentation technique

Jinxu Li; Takahito Ohmura; Kaneaki Tsuzaki

doi:10.2320/matertrans.46.1301

Evaluation of grain boundary effect on strength of Fe-C low alloy martensitic steels by nanoindentation technique

Jinxu Li, Takahito Ohmura, Kaneaki Tsuzaki

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	1301-1305
Number of pages	5
Journal	Materials Transactions
Volume	46
Issue number	6
DOIs	https://doi.org/10.2320/matertrans.46.1301
Publication status	Published - Jun 1 2005
Externally published	Yes

All Science Journal Classification (ASJC) codes

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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abstract = "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.",

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