Test method of phase change heat in salt bath of metallic material
A technology of metal materials and testing methods, applied in the investigation stage/state change, etc., can solve the problem of no accurate basis for the selection of cooling control system parameters, and achieve the effect of high accuracy
Active Publication Date: 2011-08-17
SHOUGANG CORPORATION
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[0003] The invention provides a method for testing the heat of phase change in the salt bath process of metal materials, which solves the problem that the estimated heat of phase change is smaller than the actual latent heat of phase change, resulting in no accurate basis for parameter selection of the cooling control system for salt bath quenching The problem
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[0014] The temperature change during the metal material salt bath is drawn as a temperature-time curve, such as figure 1 As shown, draw the temperature rise-time curve of the salt bath medium in the salt bath process, such as figure 1 As shown, the distortion point on the cooling curve is determined by using the release characteristics of the phase change latent heat after rapid cooling, such as figure 1 As shown, the characteristic points of the cooling curve distortion determine the metal material phase transition start t1, phase transition end time t2, and the temperature drop ΔT after the salt bath. According to the salt bath agent temperature rise ΔT1, the quality of the salt bath agent, and The heat capacity of the salt bath agent is used to calculate the heat exchange between the metal material and the salt bath agent during the whole process ΔQ1=m 盐 ×ΔT1×C 盐 , according to the mass, heat capacity, and temperature drop of the metal material, calculate the non-phase-ch...
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A test method of phase change heat in salt bath of a metallic material belongs to the field of material heat processing. In the test method for isothermal phase change heat of a salt bath quenching metallic material, a temperature-time change curve of the metallic material is firstly drawn in salt bath process, simultaneously, a temperature increase-time curve of salt bath medium is drawn in the salt bath process, the deformation characteristic pint of the cooling curve is ensured by using the releasing characteristic of phase change heat after rapid cooling, and the phase change beginning and phase change ending time and temperature drop of the metallic material are determined according to the characteristics of cooling curve deformation. The heat exchanges of the metallic material and the salt bath medium in the complete process are calculated according to the temperature rise of the salt bath medium, the quality of the salt bath medium and the heat capacity of the salt bath medium in the complete process; the non-phase change heat brought by the metallic material is calculated according to the weight, heat capacity and temperature drop of the metallic material, and the difference between the two parts of heat is the heat phase heat of the metallic material. The method has the advantages of simple and easy operation as well as high accuracy by testing the phase change heat in the salt bath process of metallic material in experimental method.
Description
technical field [0001] The invention belongs to the field of heat treatment of materials, and in particular provides a method for testing phase change heat of metal materials in a salt bath process, which is applied to the test of isothermal phase change heat of metal materials quenched in salt baths, and provides a basis for formulating heat treatment processes. Background technique [0002] For the metal material salt bath process, with the heat exchange between the high-temperature metal and the salt bath agent, the temperature of the salt bath agent gradually increases. In order to control the temperature range of the salt bath agent, a certain cooling system must be used to export the heat carried by the material and cool it down. The methods include air cooling, water cooling, etc., and the parameter setting of the cooling system requires accurate calculation of the heat carried by the metal material. The heat carried by the material includes phase change heat and non-p...
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IPC IPC(8): G01N25/02
Inventor 王猛王全礼胡雄光陈明跃袁辉陈兆阳王丽萍周德张玮
Owner SHOUGANG CORPORATION