论文部分内容阅读
将含碳气体和惰性载体气通入热处理炉对黑色金属零件进行的热处理,是通过测定炉内反应所产生的一氧化碳含量和控制对应一氧化碳含量的惰性载体气含量来控制的,而且通过使平衡效应最小化来控制所需的碳势。当一氧化碳含量小于3％或最好小于1％(体积比)时,就能得到最佳效果。控制一氧化碳含量能使有害的脱碳剂(氧、二氧化碳,水蒸汽)的效应最小。在采用本发明方法进行操作的条件下,碳氢化合物气体的分解反应和主渗碳反应都是非平衡反应,而且能控制工艺的效果。当用惰性载体气控制一氧化碳含量小于3％或最好小于1％时,则氧化反应、副渗碳反应和氢气脱碳反应都是平衡反应,但也都是最小的反应。本发明的热处理工艺是用非平衡反应控制的,所以在黑色金属零件上所得的碳势是时间和温度的函数。
The heat treatment of the ferrous metal parts by passing the carbonaceous gas and the inert carrier gas into the heat treatment furnace is controlled by measuring the carbon monoxide content produced by the reaction in the furnace and controlling the inert carrier gas content corresponding to the carbon monoxide content and by controlling the equilibrium effect Minimize to control the required carbon potential. When the carbon monoxide content is less than 3% or preferably less than 1% (volume ratio), the best effect can be obtained. Controlling the carbon monoxide content minimizes the effects of harmful decarbonizers (oxygen, carbon dioxide, water vapor). Under the conditions of operation of the method of the present invention, both the decomposition of the hydrocarbon gas and the main carburization reaction are non-equilibrium reactions and the effect of the process can be controlled. When the inert carrier gas is used to control the carbon monoxide content to be less than 3% or preferably less than 1%, then the oxidation reaction, the sub-carburization reaction and the hydrogen decarburization reaction are both equilibrium reactions but are also the smallest reactions. The heat treatment process of the present invention is controlled with a non-equilibrium reaction so that the carbon potential obtained on ferrous parts is a function of time and temperature.