Abstract
Microstructure evolution and mechanical properties of low cost Ti-2Fe-0.1B alloy under different heat treatment were studied. Results indicated that two kinds of equiaxed microstructures with different characteristics were obtained in conventional and double annealing, and typical lamellar microstructure was obtained in β annealing. Tensile test results shown that as-received rolled alloy possess highest strength and plasticity simultaneously due to fine and entangled microstructure. Uniform equiaxed dimples were observed in microstructure, which revealed ductile fracture morphology. Key words: titanium alloy; microstructure; heat treatment; mechanical properties
Highlights
Titanium and titanium alloys are a kind of “marine metal” with high specific strength, non-magnetic properties and excellent corrosion resistance in seawater
Among the four kinds of specimens, only the area of the shear lip in the microstructure by CA heat treatment is larger, which indicates that the plasticity of the alloy under this condition is poor
Fine equiaxed dimples are evenly distributed on the fracture surface for as-rolled and CA heat treatment, which indicates that the fracture mode is ductile fracture
Summary
Titanium and titanium alloys are a kind of “marine metal” with high specific strength, non-magnetic properties and excellent corrosion resistance in seawater. Adding 1.0 wt.% Fe to the as-cast Ti-10Zr alloy can significantly refine the width of the martensite α' in the structure, which can increase the strength and hardness of the alloy, and improve the wear properties of the material[5]. This shows that it is effectively to improve the properties of titanium alloy by adding inexpensive alloying elements (Fe, etc.) most studies on the influence of Fe element to the properties of alloys are based on binary or multi-component titanium alloys. When the Fe content was 3 ~ 4wt.%, the alloy could achieve the best matching of strength and plasticity These studies show that appropriate or trace of Fe addition can play a positive role in improving and optimizing the properties of titanium alloys. It can improve the cold and hot deformation ability of the alloys, and have a very important influence on the performance optimization of the alloys, especially on the matching of strength and toughness
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