Method for Determination of Titanium/Titanium Alloy β Phase Transition Temperature Based on Dynamic Thermal Simulator

Abstract

The invention discloses a method for measuring the β phase transition temperature of a titanium / titanium alloy based on a dynamic thermal simulator, comprising the steps of: preparing a sample, welding a first thermocouple in the middle of the sample; performing a thermal expansion test on a sample, And a thermal dilatometer is installed on the outside of the sample, and the dL-T curve of the sample is recorded by the thermal dilatometer; the linear change region of the high temperature zone of the dL-T curve is determined; 0 ‑5°C is the upper limit temperature, and the multi-stage quenching temperature is selected downwards with a specific inter-stage temperature difference. The first-stage quenching temperature corresponds to one sample for quenching; observe the metallographic structure of the sample after quenching, and then obtain the β phase transition temperature. The method of the invention overcomes the defects of long cycle time, heavy workload and low precision in the prior art, can complete the measurement in the shortest 3.8 hours, and has the advantages of simple sample preparation requirements and the like.

Description

technical field [0001] The invention belongs to the field of measuring the beta phase transition temperature of titanium alloys, in particular to a method for measuring the beta phase transition temperature of titanium / titanium alloys based on a dynamic thermal simulator. Background technique [0002] Titanium and titanium alloys have become key structural materials in the aviation and aerospace industries due to their high specific strength, high specific stiffness, good corrosion resistance, low thermal expansion coefficient, and high melting point. Get a wide range of applications. Titanium and titanium alloys will undergo allotropic transformation during heating or cooling, and the complete transformation temperature of α+β→β during the heating process is the β transformation temperature. The composition and processing technology of different batches of titanium alloy raw materials lead to different β transformation temperatures. Therefore, the β transformation tempera...

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Problems solved by technology

Among them, the metallographic method is the most intuitive and accurate, but the time period is long (about 2 to 3 days), the workload is heavy, and the measurement accuracy is affected by the control accuracy of the resistance furnace and the temperature gradient.

The calculation method is low in cost and small in workload, but due to composition segregation and other reasons, the calculation results have large errors, so it can only be used as a reference temperature

Differential thermal analysis has high efficiency and moderate cost, but because titanium and titanium alloys often have insignificant thermal effects, it is impossible to accurately determine their phase transition point

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