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金属和合金零件表面饱和氮和碳的工艺方法,在化学热处理领域中占有相当大的比重。因此对化学热处理中的渗碳、渗氮和碳氮共渗过程的效率引起了人们的广泛重视。化学热处理的效率可根据饱和气体(渗剂)有效利用系数Υ来评定。γ=M_1/M_2 100% (1)式中,M_1为元素吸收量,M_2是在工艺时间内通入炉中的渗剂气氛中的元素含量。零件表面吸收元素量与扩散层的相成份有关。若元素仅仅以固溶形式存在于强化层的基体中,则吸收元素量M_1可由下式确定。
Metal and alloy parts surface of saturated nitrogen and carbon process, chemical heat treatment in the field occupy a large proportion. Therefore, the efficiency of carburizing, nitriding and carbonitriding in chemical heat treatment has attracted people’s attention. The efficiency of chemical heat treatment can be based on the saturated gas (permeate) effective utilization factor Υ to assess. γ = M_1 / M_2 100% (1) Where, M_1 is the amount of element absorption, and M_2 is the content of elements in the infiltrating agent atmosphere introduced into the furnace during the process time. The amount of absorbed element on the part surface is related to the phase composition of the diffusion layer. If the element exists in the matrix of the strengthening layer only in solid solution, the amount of the absorbing element M_1 can be determined by the following equation.