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在对渗碳件渗层深度的检测中,为简便起见,通常以钢号相同的随炉小圆棒(φ10mm左右)作炉前宏观测深及最终的显微精测之用。检验表明:由于试棒与实物的形状、曲率不一,两者的渗层深度有相当差距。如我厂客车铰接大球肖,钢号20CrMnTi,球径φ120mm,要求渗碳深度1.75～2.25mm。若要从小圆棒的渗碳深度上确定大球肖的实际渗层深度,则必须探求两者深度值的换算。一换算过程设经同炉次气体渗碳的圆柱体(半径R_1,高度h)和球体(球半径R_2),它们的渗层深度分别记作δ_1和δ_2,
For the purpose of testing the depth of infiltration of the carburized parts, for the sake of simplicity, it is usually used for the macro-depth measurement before the furnace and the final micro-precision measurement with the small steel rods (φ10mm or so) with the same steel number. Test shows that: due to the shape of the test stick and the physical, curvature, the depth of the two have a considerable gap. As my factory bus articulated ball Xiao, steel 20CrMnTi, ball diameter φ120mm, requiring carburizing depth of 1.75 ~ 2.25mm. To determine the actual depth of pellicle from the depth of carburization of small round rods, the conversion of the depth values of the two must be explored. A conversion process set by the furnace gas carburizing cylinder (radius R_1, height h) and the sphere (sphere radius R_2), their depth of infiltration were recorded as δ_1 and δ_2, respectively,