To develop the multiple parameters of heat treatment and composite heat treatment process

The traditional heat treatment, in terms of the parameters of the main control, for the temperature under the atmospheric pressure more time two parameters of heat treatment; In terms of process approach, more into a single heat treatment. This effect can only be simplification of the heat treatment. Therefore, to develop the composite heat treatment process parameters of heat treatment and more. Heat treatment ( 1) 。 Vacuum heat treatment which is a kind of additional stress parameters of heat treatment. It has no oxidation and decarburization, surface brightness, small deformation, no pollution, energy saving, the advantages of high automation, wide applicable scope, is one of the fastest growing heat treatment technology in recent years, especially in the aspect of material surface modification gained great progress, many of the recent development of advanced heat treatment technology, such as vacuum high-pressure gas quenching, vacuum chemical heat treatment, etc. , should also can implement at the bottom of the vacuum. The vacuum heat treatment technology can make the structure material, working mould quality and greatly improve the service life, especially suitable for some precision parts heat treatment. In the industrial developed countries, the proportion of vacuum heat treatment has reached about 20%, and about 1200 sets of vacuum heat treatment furnace of our country, accounting for about 1% of the total number of heat treatment furnace, with foreign gap is very big. Is expected in the future with the technology progress and the heat treatment of workpiece heat treatment industry more and more high quality requirements, vacuum heat treatment will have a bigger development. ( 2) 。 Chemical heat treatment which is an additional component of multiple parameters of heat treatment. Ordinary chemical heat treatment, such as carburizing and carbonitriding boron, carbon and nitrogen altogether permeability, etc. , and respectively belong to additional single component, two components and three components of multiple parameters of heat treatment. Use new technology developed in recent years, and many of the new chemical heat treatment, such as vacuum chemical heat treatment, chemical heat treatment, metal ion infiltration flow bed, ion implantation, laser surface alloying, etc, all can improve the wear resistance and corrosion resistance of workpiece using performance. Rare earth application in the chemical heat treatment ( The permeability with rare earth) , can significantly increase the infiltration rate, shorten the processing cycle, wear resistance and corrosion resistance and can improve the filter bed, this is one of the features of our country. In addition, learn solid solution heat treatment is also a notable trend, Inner Mongolia agricultural machinery research institute jian-hong huang et al. developed nitrogen martensite processing ( N * M) Process, this is the first to get solid solution N nitrogen martensite nitriding process, for the purpose of has been successfully applied in the shearing machine blade production. ( 3) 。 Thermomechanical treatment that is more than a kind of additional stress parameters of heat treatment. By adopting the combination of pressure processing and heat treatment process, combine deformation strengthening and phase transformation strengthening, cause the material to achieve the dual purpose of molding and composite reinforcement. Thermomechanical treatment can improve the comprehensive mechanical properties of materials, and can simplify the process, the use of waste heat, save energy and material consumption, the economic benefit is remarkable. Thermomechanical treatment of wide application, from the structural steel, bearing steel are applicable to the high speed steel. In industrial application at present most is forging residual heat quenching and controlled rolling. The controlled rolling is used to produce high hardness armor plate, can improve the resistance to elastic energy. Industrial systems for our country to carry out the artillery shells, hot die forging parts hardening, rotating precision forging thermomechanical treatment of gun tube, steel core roll residual heat quenching bullet test research, has obtained the good effect. Composite heat treatment composite heat treatment is to two or more than the heat treatment process of compound, or heat treatment and other processing of composite, so you can get involved in combination of the comprehensive effect of several kinds of process, to obtain good performance of components, and save energy, reduce costs, improve production efficiency. Such as nitriding composite with high frequency quenching, quenching and ooze sulfur compound, boronizing and powder metallurgy sintering process of compound, etc. The forging residual heat quenching and controlled rolling also belong to the composite heat treatment, they are forging and heat treatment of compound, rolling and heat treatment of compound. There are also some new composite surface treatment technology, such as laser heating and chemical vapor deposition ( CVD) , ion implantation and physical vapor deposition ( 周围性血管疾病) And physical and chemical vapor deposition ( PCVD) And so on, all have the significant effect of surface modification of application at home and abroad is also increasing. Need to point out that composite heat treatment is not a simple superposition of several single heat treatment process, but according to the requirement of the workpiece using performance and the characteristics of each kind of heat treatment process are organically combined together, in order to achieve the goal of complement each other, complement each other. For example, for a variety of processing temperature of the heat treatment process is different, you need to consider in combination in the order of heat treatment process of avoid process after the to offset before action.