论文部分内容阅读
应用正交试验法研究了GDL-1钢经渗碳后的液体软氮化复合热处理工艺,分析氮化时间、氮化温度及CNO-浓度对GDL-1钢复合渗层的渗层硬度、渗层深度和白亮层的影响.结果表明:渗层表面硬度主要由盐浴CNO-浓度控制,并随CNO-浓度的升高呈现先升后降的趋势,盐浴CNO-浓度为18%左右时表面硬度达到最大值;渗层深度随氮化温度的升高和时间的延长而增加,但当温度超过560℃、处理时间超过2.5h之后,增加的趋势变缓;当温度超过560℃后,渗层白亮层增厚明显。试验得到最佳软氮化工艺参数:CNO-浓度18%,(560±10)℃×2.5 h.
Orthogonal test method was used to study the nitrocarburizing liquid heat treatment process of GDL-1 steel after carburizing. The nitriding time, nitriding temperature and CNO concentration were used to study the hardness and infiltration of GDL-1 steel composite infiltration layer Layer depth and white-bright layer.The results show that the surface hardness of the permeation layer is mainly controlled by the salt bath CNO-concentration, and then increases with the CNO-concentration increasing first and then decreasing.The salt bath CNO- concentration is about 18% The surface hardness reaches the maximum value; the depth of nitrided layer increases with the increase of nitriding temperature and time, but when the temperature exceeds 560 ℃ and the treatment time exceeds 2.5h, the increasing trend slows down; when the temperature exceeds 560 ℃, Penetration white bright layer thickening obvious. The optimum nitrocarburizing process parameters were obtained: CNO-concentration 18%, (560 ± 10) ℃ × 2.5 h.