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Effect of solution treatment and aging on microstructure, tensile properties and creep behavior of a hot-rolled β high strength titanium alloy with a composition of Ti-3.5Al–5Mo–6V–3Cr–2Sn-0.5Fe-0.1B-0.1C

Microstructure, tensile properties and creep behavior of a hot-rolled β high strength Ti-3.5Al–5Mo–6V–3Cr–2Sn-0.5Fe-0.1B-0.1C alloy were investigated in the present study. The alloy was heat treated along different regimes to study the effect of heat treatments on microstructure evolution, tensile a...

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Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2021-08, Vol.823, p.141728, Article 141728
Main Authors: Chen, Zhaoqi, Xu, Lijuan, Liang, Zhenquan, Cao, Shouzhen, Yang, Jiankai, Xiao, Shulong, Tian, Jing, Chen, Yuyong
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container_title Materials science & engineering. A, Structural materials : properties, microstructure and processing
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description Microstructure, tensile properties and creep behavior of a hot-rolled β high strength Ti-3.5Al–5Mo–6V–3Cr–2Sn-0.5Fe-0.1B-0.1C alloy were investigated in the present study. The alloy was heat treated along different regimes to study the effect of heat treatments on microstructure evolution, tensile and creep properties. After solution treated at 830 °C and aged at 300 °C, 560 °C successively, the microstructure yielded equiaxed β grains and acicular secondary α phase with small size because of assisted-nucleation effect of ω phase and pseudo-spinodal mechanism. The alloy had the highest strength of both ultimate tensile strength (1508 MPa) and yield strength (1440 MPa). And all the specimens treated along different regimes manifested the features of combined fracture mechanism with the existence of ductile dimples and cleavage surfaces. After creep deformation for 100 h, the alloy solution treated and aged at 560 °C had the lowest steady-stage creep rate and minimal creep strain of 3.9%. In addition, during the heat treatments, some equiaxed α phase precipitated abnormally and dissolved into β matrix during the creep deformation. The phenomenon can be attributed to the differences of diffusion ability among different compositions, which resulted in the appearance of composition fluctuation and non-equilibrium precipitation. •The effect of heat treatments on microstructure evolution and tensile properties was investigated.•The creep behavior of the alloy treated along different regimes was investigated.•An abnormal precipitation of α-Ti phase after solution treated at β-single region was found.•A mechanism of the abnormal precipitation was proposed.
doi_str_mv 10.1016/j.msea.2021.141728
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The phenomenon can be attributed to the differences of diffusion ability among different compositions, which resulted in the appearance of composition fluctuation and non-equilibrium precipitation. •The effect of heat treatments on microstructure evolution and tensile properties was investigated.•The creep behavior of the alloy treated along different regimes was investigated.•An abnormal precipitation of α-Ti phase after solution treated at β-single region was found.•A mechanism of the abnormal precipitation was proposed.</description><identifier>ISSN: 0921-5093</identifier><identifier>EISSN: 1873-4936</identifier><identifier>DOI: 10.1016/j.msea.2021.141728</identifier><language>eng</language><publisher>Lausanne: Elsevier B.V</publisher><subject>Abnormal precipitation ; Composition ; Creep behavior ; Creep rate ; Creep strength ; Deformation ; Dimpling ; Ductile fracture ; Fracture mechanics ; Heat treating ; Heat treatment ; High strength alloys ; Hot rolling ; Metastable β titanium alloy ; Microstructure ; Microstructure evolution ; Nucleation ; Solution heat treatment ; Tensile properties ; Titanium alloys ; Titanium base alloys ; Ultimate tensile strength</subject><ispartof>Materials science &amp; engineering. 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A, Structural materials : properties, microstructure and processing</jtitle><date>2021-08-17</date><risdate>2021</risdate><volume>823</volume><spage>141728</spage><pages>141728-</pages><artnum>141728</artnum><issn>0921-5093</issn><eissn>1873-4936</eissn><abstract>Microstructure, tensile properties and creep behavior of a hot-rolled β high strength Ti-3.5Al–5Mo–6V–3Cr–2Sn-0.5Fe-0.1B-0.1C alloy were investigated in the present study. The alloy was heat treated along different regimes to study the effect of heat treatments on microstructure evolution, tensile and creep properties. After solution treated at 830 °C and aged at 300 °C, 560 °C successively, the microstructure yielded equiaxed β grains and acicular secondary α phase with small size because of assisted-nucleation effect of ω phase and pseudo-spinodal mechanism. The alloy had the highest strength of both ultimate tensile strength (1508 MPa) and yield strength (1440 MPa). And all the specimens treated along different regimes manifested the features of combined fracture mechanism with the existence of ductile dimples and cleavage surfaces. After creep deformation for 100 h, the alloy solution treated and aged at 560 °C had the lowest steady-stage creep rate and minimal creep strain of 3.9%. In addition, during the heat treatments, some equiaxed α phase precipitated abnormally and dissolved into β matrix during the creep deformation. The phenomenon can be attributed to the differences of diffusion ability among different compositions, which resulted in the appearance of composition fluctuation and non-equilibrium precipitation. •The effect of heat treatments on microstructure evolution and tensile properties was investigated.•The creep behavior of the alloy treated along different regimes was investigated.•An abnormal precipitation of α-Ti phase after solution treated at β-single region was found.•A mechanism of the abnormal precipitation was proposed.</abstract><cop>Lausanne</cop><pub>Elsevier B.V</pub><doi>10.1016/j.msea.2021.141728</doi><orcidid>https://orcid.org/0000-0002-0107-316X</orcidid><orcidid>https://orcid.org/0000-0003-3157-3306</orcidid></addata></record>
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subjects Abnormal precipitation
Composition
Creep behavior
Creep rate
Creep strength
Deformation
Dimpling
Ductile fracture
Fracture mechanics
Heat treating
Heat treatment
High strength alloys
Hot rolling
Metastable β titanium alloy
Microstructure
Microstructure evolution
Nucleation
Solution heat treatment
Tensile properties
Titanium alloys
Titanium base alloys
Ultimate tensile strength
title Effect of solution treatment and aging on microstructure, tensile properties and creep behavior of a hot-rolled β high strength titanium alloy with a composition of Ti-3.5Al–5Mo–6V–3Cr–2Sn-0.5Fe-0.1B-0.1C
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