EFFECT OF COOLING RATE DURING SOLUTION HEAT TREATMENT ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF SP-700 TITANIUM ALLOYS

被引：8

作者：

Nieh, Jo-Kuang ^{[1
]}

Wu, Chih-Ting ^{[2
]}

Chen, Yen-Lin ^{[3
]}

Wei, Chao-Nan ^{[4
]}

Lee, Sheng-Long ^{[1
,3
]}

机构：

[1] Natl Cent Univ, Dept Mech Engn, Taoyuan, Taiwan

[2] Army Acad, Dept Vehicle Engn, Taoyuan, Taiwan

[3] Natl Cent Univ, Inst Mat Sci & Engn, Taoyuan, Taiwan

[4] Natl Chung Shan Inst Sci & Technol, Mat & Electroopt Res Div, Taoyuan, Taiwan

来源：

JOURNAL OF MARINE SCIENCE AND TECHNOLOGY-TAIWAN | 2016年 / 24卷 / 02期

关键词：

titanium alloy; martensite; heat treatment; mechanical properties;

D O I：

10.6119/JMST-015-0409-1

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The relationship between the microstructures and the mechanical properties of solution-treated SP-700 titanium alloys, as obtained with different cooling rates, was investigated. The results indicate that the water-quenched alloy contains the primary alpha (alpha(p)), alpha ''-martensite and residual beta (beta(r)) phases. Aging heat treatment can convert both alpha ''-martensite and the beta(r) phases to the fine-grained alpha + beta equilibrium phases, resulting in a significant increase in tensile strength and hardness. Both the air-cooled and furnace-cooled alloys consist of the alpha(p), alpha and beta phases. The air-cooled alloy containing the fine-grained alpha phase has relatively higher hardness. Aging heat treatment causes only a slight enhancement in tensile properties because it cannot convert the phases in both alloys. Stress-induced martensitic phase transformation occurs in the water-quenched alloy under applied stress, after which the alloy exhibits higher tensile strength, higher ductility, and lower yield strength.

引用

页码：99 / 106

页数：8

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