Method for measuring beta-phase transition temperature of titanium/titanium alloy based on dynamic thermal simulator

Abstract

The invention discloses a method for measuring beta-phase transition temperature of titanium/titanium alloy based on a dynamic thermal simulator, which comprises the following steps of preparing a sample, and welding a first thermocouple in the middle of the sample, performing thermal expansion test on one sample, mounting a thermal expansion meter on the outer side of the sample, and measuring adL-T curve of the sample through the thermal expansion meter, determining a linear change region of a high-temperature region of the dL-T curve, taking T0-5 DEG C as an upper limit temperature, selecting a multi-stage quenching temperature downwards according to a specific interstage temperature difference, and quenching the sample corresponding to the first-stage quenching temperature, and observing the metallographic structure of the quenched sample so as to obtain the beta-phase transition temperature of the to-be-detected material. The method provided by the invention overcomes the defectsof long period, large workload and low precision in the prior art, can finish measurement within 3.8 hours at the shortest time, and has the advantages of simple sample preparation requirement 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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