Abstract
The influence of cementation technology of titanium alloy Ti-Al-Mn on its wear resistance is studied. It is established that after lubrication a friction pair with mineral oil the wear resistance of the cemented titanium alloy is comparable to wear resistance of the tempered steel 12HN3A, and in water medium surpasses it by 1.5 times. Decrease in the tendency to seizure with steel is the main reason for increase of wear resistance of titanium alloy. Industrial tests of the ASH43 hammer have shown that the use of titanium alloys for the manufacture of hammer strikers allows to increase impact capacity by 1.5 times and to increase drilling rate by 30 % compared to hammers with steel strikers.
Highlights
At present the most efficient, cost-effective and productive drilling methods are based on the use of downhole hammers
For increase of wear resistance indicators the surface of a titanium alloy was subjected to cementations by the following modes: heating of samples in hard carburizer up to the temperature of 900 °C with soaking at this temperature for 3 hours and the subsequent cooling together with the furnace
Samples of steel 12XN3A were used for comparison of mechanical and tribotechnical properties of the modified titanium alloy; such steel is widely applied for production of details of impact mechanisms
Summary
At present the most efficient, cost-effective and productive drilling methods are based on the use of downhole hammers. The hole hammers must be as compact as possible to accommodate the limited space, and to effectively fracture the rock, they must have a considerable impact capacity. One of the most promising materials for vital parts of impact mechanisms are high-strength titanium alloys [1, 2]. The cost of titanium strikers is higher than of the steel strikers, they have lower specific gravity and high corrosion resistance [3]. This allows to increase the speed and the frequency of impact loading, as well as to use water as an energy resource medium. Titanium alloys have a high attenuation of acoustic waves and effectively extinguish reflected impact pulses [4]
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