EFFECT OF SUBSTRUCTURE FORMED IN PRIOR beta GRAIN ON CRACK INITIATION AND PROPAGATION TOUGHNESS OF Ti-6 Al-2 Sn-4 Zr-6 Mo ALLOY.

Mitsuo Niinomi; Ikuhiro Inagaki; Toshiro Kobayashi

doi:10.2355/tetsutohagane1955.74.3_543

EFFECT OF SUBSTRUCTURE FORMED IN PRIOR beta GRAIN ON CRACK INITIATION AND PROPAGATION TOUGHNESS OF Ti-6 Al-2 Sn-4 Zr-6 Mo ALLOY.

Mitsuo Niinomi, Ikuhiro Inagaki, Toshiro Kobayashi

Materials Development Division

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

1 Citation (Scopus)

Abstract

The instrumented Charpy impact test and static and dynamic fracture toughness tests were carried out on an alloy in which the prior beta grain size was changed by heat treatment. The elongation, crack initiation and propagation toughness increased with a slight decrease in strength in specimens with increased prior beta grain size with prolonged solution treatment time. The increase in crack initiation toughness was mainly caused by an increase in the widmanstaetten a lath. The increase in crack propagation toughness was caused by deflection of the crack pass. The intersubcolony spacing decreased with an increase in alpha nucleation during diffusion-controlled alpha yields beta transformation. In such situation, alpha nucleated in the interior of the beta grain and increased with the introduction of strain.

Original language	English
Pages (from-to)	543-550
Number of pages	8
Journal	Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume	74
Issue number	3
DOIs	https://doi.org/10.2355/tetsutohagane1955.74.3_543
Publication status	Published - 1988

ASJC Scopus subject areas

Condensed Matter Physics
Physical and Theoretical Chemistry
Metals and Alloys
Materials Chemistry

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10.2355/tetsutohagane1955.74.3_543

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title = "EFFECT OF SUBSTRUCTURE FORMED IN PRIOR beta GRAIN ON CRACK INITIATION AND PROPAGATION TOUGHNESS OF Ti-6 Al-2 Sn-4 Zr-6 Mo ALLOY.",

abstract = "The instrumented Charpy impact test and static and dynamic fracture toughness tests were carried out on an alloy in which the prior beta grain size was changed by heat treatment. The elongation, crack initiation and propagation toughness increased with a slight decrease in strength in specimens with increased prior beta grain size with prolonged solution treatment time. The increase in crack initiation toughness was mainly caused by an increase in the widmanstaetten a lath. The increase in crack propagation toughness was caused by deflection of the crack pass. The intersubcolony spacing decreased with an increase in alpha nucleation during diffusion-controlled alpha yields beta transformation. In such situation, alpha nucleated in the interior of the beta grain and increased with the introduction of strain.",

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