刀碗落料模具钢的渗硼工艺研究

Bowl Cutter Blanking Die's Orthogonal Doronizing

为提高刀碗落料模具的使用寿命和耐磨性,对刀碗落料模具钢进行固体正交渗硼试验.采用OLYM-PUS(BH-2)型金相显微镜观察渗层组织;用PW-1710型X射线衍射仪测定渗层的相组成;用HV-1000型显微硬度计测定渗层显微硬度;用三钾试剂浸蚀渗层来区分渗层组织;用M-200型磨损试验机进行耐磨性试验.以温度、时间和稀土加入量为三因素,优化出的渗硼工艺参数为950℃×5h,稀土加入量1.5 wt%.加稀土的渗硼层比未加稀土的渗硼层致密、宽厚且硬度高.优化渗硼后再经970℃淬火、200℃回火处理,渗硼层耐磨性显著提高.

In order to improve the lifetime and the wear resistance of bowl cutter blanking die, an experiment of pack orthogonal boronizing was done. The microstructure of boronizing was observed by OLYMPUS （ BH- 2） microscope; and the phase group was determined by PW-1710 ray diffractometer; and the microhardness was detected by HV-1000 microhardness tester; and through THREE K reagent solution , the microstructure of boronizing was divided; and by using M-200 wear tester , the wear resistance was tested . The experiments show that, based on orthogonal experiment with three factors such as temperature.time and RE addition volume, the optimizing boronizing process parameters are 950℃× 5 h, and 1.5 wt% RE. The depth of boronizing layer has relations to RE addition volume, and the thickest boronizing layer is found at 1.5wt% RE. The boronizing layer adding RE in boronizing agent is denser.thicker and harder than that without adding RE in boronizing agent. After optimizing boronizing , and then quenching at 970℃ , and tempering at 200℃, the wear resistance of boronizing layer is higher than that without quenching and tempering.