Keywords: high alloy steel, quenching furnace, quenching, furnace, quenching temperature,

　　For some high alloy steels, such as D2.D3, the volume or length decreases as the temperature of the quenching furnace increases. This is because as the quenching temperature increases, the residual austenite of the steel increases. For example, the quenching temperature of D3 is increased to 1040 & mdash;1080 degrees celsius, D2 increased to 1070 & mdash;1120 degrees celsius can reduce the phenomenon of its volume increase. But continue to increase the quenching temperature, it will cause the opposite direction of the deformation & mdash; shrink. Tempering for lower quenching temperature, such as 980 & mdash; For D2 surface quenched at 1050 degrees Celsius, the volume and length are reduced after tempering, mainly due to the martensite-based microstructure obtained at lower quenching temperature, and tempered martensite obtained after tempering, whose square degree is less than that of quenched martensite, which is the main reason for the reduction. For steel parts quenched at 1200 degrees Celsius and tempered at 520 degrees Celsius for many times, it is also known as the secondary hardening process. The volume and length of the steel parts are mainly increased after tempering. The main reason is that there is a large amount of residual austenite in the steel parts after high temperature quenching, and the residual austenite is transformed into martensite after multiple high temperature tempering.

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