Multi-step heat treatment design for nano-scale lamellar structures of a cast Ti-45Al-8.5Nb-(W, B, Y) alloy

Fengming Qiang; Hongchao Kou; Guang Yang; Bin Tang; Jinshan Li

doi:10.1016/j.intermet.2016.09.006

Multi-step heat treatment design for nano-scale lamellar structures of a cast Ti-45Al-8.5Nb-(W, B, Y) alloy

Fengming Qiang, Hongchao Kou, Guang Yang, Bin Tang, Jinshan Li

School of Materials Sience and Engineering

Northwestern Polytechnical University Xian

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

19 Scopus citations

Abstract

A multi-step heat treatment is proposed to optimize the lamellar structure of as-cast high Nb containing TiAl alloys. The β-segregation is removed effectively after the first two step heat treatment, a short-time holding within β single phase field then annealing in α+β phase field. During the third step heat treatment, a subsequent low-temperature aging, new γ lamellae precipitate by the means of isolated nucleation or twin-related nucleation. After the proposed multi-step heat treatment, the alloy presents nano-scaled lamellar structure with the colony size about 140 μm.

Original language	English
Pages (from-to)	35-40
Number of pages	6
Journal	Intermetallics
Volume	79
DOIs	https://doi.org/10.1016/j.intermet.2016.09.006
State	Published - 1 Dec 2016

Keywords

Heat treatment
Lamellar structure
Phase transformation
Segregation
Titanium aluminides

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title = "Multi-step heat treatment design for nano-scale lamellar structures of a cast Ti-45Al-8.5Nb-(W, B, Y) alloy",

abstract = "A multi-step heat treatment is proposed to optimize the lamellar structure of as-cast high Nb containing TiAl alloys. The β-segregation is removed effectively after the first two step heat treatment, a short-time holding within β single phase field then annealing in α+β phase field. During the third step heat treatment, a subsequent low-temperature aging, new γ lamellae precipitate by the means of isolated nucleation or twin-related nucleation. After the proposed multi-step heat treatment, the alloy presents nano-scaled lamellar structure with the colony size about 140 μm.",

keywords = "Heat treatment, Lamellar structure, Phase transformation, Segregation, Titanium aluminides",

author = "Fengming Qiang and Hongchao Kou and Guang Yang and Bin Tang and Jinshan Li",

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year = "2016",

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T1 - Multi-step heat treatment design for nano-scale lamellar structures of a cast Ti-45Al-8.5Nb-(W, B, Y) alloy

AU - Qiang, Fengming

AU - Kou, Hongchao

AU - Yang, Guang

AU - Tang, Bin

AU - Li, Jinshan

PY - 2016/12/1

Y1 - 2016/12/1

N2 - A multi-step heat treatment is proposed to optimize the lamellar structure of as-cast high Nb containing TiAl alloys. The β-segregation is removed effectively after the first two step heat treatment, a short-time holding within β single phase field then annealing in α+β phase field. During the third step heat treatment, a subsequent low-temperature aging, new γ lamellae precipitate by the means of isolated nucleation or twin-related nucleation. After the proposed multi-step heat treatment, the alloy presents nano-scaled lamellar structure with the colony size about 140 μm.

AB - A multi-step heat treatment is proposed to optimize the lamellar structure of as-cast high Nb containing TiAl alloys. The β-segregation is removed effectively after the first two step heat treatment, a short-time holding within β single phase field then annealing in α+β phase field. During the third step heat treatment, a subsequent low-temperature aging, new γ lamellae precipitate by the means of isolated nucleation or twin-related nucleation. After the proposed multi-step heat treatment, the alloy presents nano-scaled lamellar structure with the colony size about 140 μm.

KW - Heat treatment

KW - Lamellar structure

KW - Phase transformation

KW - Segregation

KW - Titanium aluminides

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AN - SCOPUS:84988557047

SN - 0966-9795

VL - 79

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JO - Intermetallics

JF - Intermetallics

ER -

Multi-step heat treatment design for nano-scale lamellar structures of a cast Ti-45Al-8.5Nb-(W, B, Y) alloy

Abstract

Keywords

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