IMI834 titanium alloy, corresponding to the domestic grade Ti-150, has a nominal composition of Ti-5.8Al-4Sn-3.5Zr-0.7Nb-0.5Mo-0.35Si. IMI834 alloy contains a small amount of -phase stabilizing elements, and different thermal processing techniques and heat treatment regimes can significantly affect the microstructure of the alloy, thereby influencing its mechanical properties. IMI834 titanium alloy is widely recognized as a high-temperature titanium alloy material with excellent high specific strength, creep resistance, and thermal stability at 600℃.
1. Physical Properties
The phase transformation point of IMI834 titanium alloy bar is 1040℃, with a density of 4.55 g/cm³ and a Poisson's ratio of 0.33.
2. Room Temperature Tensile Fracture Morphology
The IMI834 titanium alloy bar was subjected to heat treatment at 1000 ℃ for 2 hours followed by rapid cooling. The room temperature tensile fracture morphology is shown in Figure 1. The fracture surface exhibits significant undulation, with conspicuous grooves and pores in the radial zone, while the shear lip zone appears bright white. The micro-morphology of the crack origin zone and radial zone shows many indistinct cleavage facets, mainly polygonal or elliptical in shape. Around the small facets, numerous dimples and tear ridges can be observed, along with secondary cracks, which are obvious indicators of quasi-cleavage.
IMI834 alloy under rapid cooling conditions
3. Mechanical PropertiesThe room temperature tensile mechanical properties of IMI834 titanium alloy bars are shown in Table 1.
|
σb |
σp0.2 |
δ5 /% |
ψ/% |
||||
|
20 |
L |
>=1070 |
>=960 |
>=8 |
>=10 |
||
IMI834 titanium alloy is a new type of high-temperature resistant structural material. Due to its density, strength, and operating temperature being between aluminum and steel, and its characteristics of low density, high strength, high toughness, and corrosion resistance, it is used to manufacture key components such as turbine rotors and blades of aircraft engines. It is an early-developed high-temperature titanium alloy capable of withstanding 600℃ and has been widely applied. It has been used in engines such as the Trent700, EJ200, and PW350, and foreign turboprop engine centrifugal impellers have also selected the IMI834 alloy.
The IMI834 titanium alloy bars and wires are mainly delivered with polished or buffed surfaces, exhibiting a uniform and consistent appearance without cracks, folds, or scratches. The shape and dimensional tolerances meet standard requirements. Generally, they are shipped in wooden boxes after soft packaging.
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