Testing method for determining quenching speeds through thermal simulation test

Abstract

The invention discloses a testing method for determining quenching speeds through a thermal simulation test and belongs to the technical field of thermal simulation. The testing method includes the following steps that A, multiple sets of samples made of the same material are kept in a thermal simulation tester for heating and heat holding at the same quenching temperature for the same heat holding time; B, different quenching speeds are set for quenching of the samples; C, the same tempering process is set for tempering of the samples; D, the multiple sets of samples obtained after thermal treatment are subjected to an impulse test at the required temperature, and respective shock absorption energy is obtained; E, a curve is drawn with the quenching speeds as transverse coordinates and the shock absorption energy as longitudinal coordinates, and the critical quenching speeds meeting the use requirement under the condition of the quenching temperature and the heat holding time are obtained. A reliable basis is provided for thermal treatment process parameter selection by determining the critical quenching speeds, meeting qualified material mechanical performance, of the samples.

Description

technical field [0001] The invention relates to the technical field of thermal simulation, in particular to a test method for determining a quenching cooling rate through a thermal simulation test. Background technique [0002] Because thermal simulation technology can economically and effectively study the structure and performance changes of materials and components under heating, or under the condition of heating and stress at the same time, it can provide reliable technical data and analysis and judgment basis for actual engineering structures and product production processes. It has attracted more and more attention from the engineering and scientific circles; so far, thermal simulation test devices can be divided into two types: direct energization resistance heating and high-frequency induction heating according to the heating method. Gleebl thermal simulator is a set of temperature, pressure , Strain parameters are controlled in a resistance heating full analog devic...

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Problems solved by technology

[0003] Rotor products are widely used in steam turbines, gas turbines, wind power and other power generation equipment. The service conditions are harsh, and the service temperature ranges from -40 to 600°C. Therefore, the mechanical properties of the materials are very strict. Impact absorption energy and ductile-brittle transition temperature are important. One of the performance indicators; a certain material can only meet the design requirements if the purity of molten steel is guaranteed and the appropriate heat treatment process; the selection of heat treatment process parameters needs to be obtained through experiments. At the same time, the quenching and heat preservation temperature of the heat treatment test equipment is easy to control. The speed cannot be accurately controlled, and the cooling rate is just one of the important factors affecting the mechanical performance index; the large-diameter rotor core is easy to reduce the low-temperature impact toughness and increase the ductile-brittle transition temperature due to insufficient quenching cooling rate