The appearance of the titanium rod is very similar to that of steel, with a density of 4.51 g/cm3, which is less than 60% of that of steel. It is the lowest density metallic element in refractory metals. The mechanical properties of titanium, i.e. mechanical properties, are closely related to purity. High-purity titanium has excellent machinability, excellent elongation and area shrinkage, but is not suitable for use as a structural material due to its low strength. Industrial pure titanium contains appropriate amount of impurities, high strength and plasticity, and is suitable for making structural materials. Titanium and titanium alloy billets have low thermal conductivity, which will cause a large temperature difference between the surface layer and the inner layer during hot extrusion. When the temperature of the extrusion cylinder is 400, the temperature difference can reach 200~250. Under the combined influence of suction strengthening and the large temperature difference of the billet section, the metal on the surface and the center of the billet has completely different strength and plasticity, which will cause very uneven deformation during the extrusion process, and produce a large additional tensile force on the surface layer. Stress becomes the source of cracks and cracks on the surface of extruded products. The hot extrusion process of titanium and titanium alloy products is more complicated than that of aluminum alloys, copper alloys and even steel, which is determined by the special physical and chemical properties of titanium and titanium alloys.
Until now, lubricants had to be used during the extrusion of titanium rods. The main reason is that titanium will form eutectic with iron-based or nickel-based alloy mold materials at 980 and 1030, which will cause strong mold wear. When graphite lubricants are used, deep longitudinal scratch lines are formed on the surface of the product, which is the result of titanium rods and titanium alloy rods sticking to the mold. When the profile is extruded with glass lubricant, a new type of defect "pocket", that is, cracks on the surface of the product, will occur. Studies have shown that the appearance of "pitting" is due to the low thermal conductivity of titanium and titanium alloys, which causes the surface layer of the billet to cool sharply and the plasticity drops sharply.
Titanium alloys can be divided into low strength and high plasticity, medium strength and high strength, ranging from 200 MPa to 1300 MPa, but can be regarded as high strength alloys in general. They have higher strength than aluminum alloys, which are considered medium strength, and can completely replace some types of steel in terms of strength. Compared with the rapid decline in strength of aluminum alloys above 150, some titanium alloys can still maintain good strength at 600. Titanium is a dense metal that is highly valued by the aviation industry because of its light weight, higher strength than aluminum alloys, and higher high temperature strength than aluminum. Given that the density of titanium is 57% of that of steel, its specific strength (strength/weight ratio or strength/density ratio is called specific strength), corrosion resistance, oxidation resistance, and fatigue resistance are very strong. Three-quarters of titanium alloys are used as structural materials represented by aerospace structural alloys, and one-quarter is mainly used as corrosion-resistant alloys. Titanium alloys have high strength, low density, good mechanical properties, good toughness and corrosion resistance. In addition, titanium alloys have poor processing performance, are not easy to cut, and are easy to absorb impurities such as hydrogen, oxygen, nitrogen, and carbon during hot processing. In addition, the wear resistance is poor and the production process is complicated. Industrial production of titanium began in 1948. With the development of the aviation industry, the titanium industry is growing at an average annual rate of about 8%. At present, the annual output of titanium alloy processing materials in the world has reached more than 40,000 tons, and there are nearly 30 titanium alloy grades. The most widely used titanium alloys are ti-6al-4v (TC4), ti-5al-2.5sn (ta7) and industrial pure titanium (TA1, TA2 and TA3).
Contact us for more information. Thank you
Nicole
Company: Baoji Jimiyun Dynamic Co., Ltd
Cuntry:China
Add:Baoti road,Jintai,Baoji city,Shaanxi,China
Cel:+86 13369210920
Gmail:nicole@jmyunti.com
Website:www.jm-titanium.com
