三牙轮钻头复合渗硼层制备工艺及耐磨性研究

发布时间：2018-05-17 08:10

本文选题：碳化硼 + 硼铁　；参考：《辽宁工程技术大学》2015年硕士论文

【摘要】：研究利用粉末包埋法,以B4C和硼铁为供硼剂,黄血盐为供氮剂,Na_2S_2O_3和FeS为供硫剂,在20CrMo钢气体渗碳件上制备复合渗硼层。采用金相显微镜、X射线衍射仪对渗层组织及结构进行检测分析,并对硬度、磨粒磨损和粘着磨损性能进行了测试。XRD分析结果显示：B-C复合渗层中有Fe_2B、FeB、Fe_3C相生成；B-C-N-S复合渗层中有Fe_2B、Fe_3N、FeS、Fe_3C相生成。硼铁B-C及B-C-N-S复合渗层与碳化硼B-C及B-C。N-S复合渗层的显微硬度最高分别为HV1 932.6、HV1 582.7和HV1 825.6、HV1445.9,渗层厚度分别为51μm、38μm和42μm、62μm,渗层与基体结合紧密。耐磨粒磨损性能测试：不同型号砂纸磨损下,硼铁B-C及B-C-N-S与碳化硼B-C及B-C-N-S复合渗层的相对耐磨性较渗碳层分别提高4.01-5.21倍、1.20-1.33倍、2.44-3.25倍、1.46-1.78倍；不同附加载荷作用下,相对耐磨性较渗碳层分别提高1.89-4.01倍、1.09-1.29倍、1.54-2.47倍、1.29-1.46倍。耐粘着磨损性能测试：干摩擦条件下,对应复合渗层的相对耐磨性较渗碳层提高1.38-1.59倍、2.91-3.34倍、1.16-1.46倍、3.92-4.54倍,摩擦系数较渗碳层由0.846分别降低到0.687、0.500、0.753、0.424；油摩擦条件下,对应复合渗层的相对耐磨性较渗碳层分别提高1.38-1.91倍、2.93-4.03倍、1.21-1.41倍、5.48-6.45倍,摩擦系数较渗碳层由0.596分别降低到0.412、0.198、0.494、0.155。硼铁渗剂B-C复合渗层的耐磨粒磨损性能最好,碳化硼渗剂B-C-N-S复合渗层的耐粘着磨损性能最好。在渗碳件表面制备B-C和B-C-N-S复合渗层能够使渗碳件的耐磨性提高,值得深入研究,使其能够应用到三牙轮钻头的实际生产中。
[Abstract]:The composite boronizing layer was prepared on 20CrMo steel gaseous Carburizing parts by powder embedding method with B _ 4C and ferric boron as boron donor and yellow blood salt as nitrogen supplying agent Na _ 2S _ 2O _ 3 and FeS as sulfur supplying agents. The microstructure and structure of the infiltrating layer were examined and analyzed by means of metallographic microscope and X-ray diffractometer, and the hardness of the layer was also analyzed. The wear and adhesion properties of abrasive particles were tested. XRD results showed that Fe2BX FeBf3 C composite infiltrating layer was formed by Fe2BN Fe3 C composite infiltrating layer and Fe2BZ Fe3N S composite infiltrating layer was formed by Fe2BX Fe3NNM FeS3 C composite infiltrating layer. The maximum microhardness of B-C and B-C-N-S composite boronizing layer and boron carbide B-C and B-C.N-S composite layer are HV1 932.6 and HV1 825.6 HV1445.9, respectively. The thickness of boronizing layer is 51 渭 m ~ 38 渭 m and 42 渭 m ~ (62) 渭 m, respectively. Wear resistance of boron iron B-C, B-C-N-S and boron carbide B-C and B-C-N-S were 4.01-5.21 times 1.20-1.33 times 2.44-3.25 times and 1.46-1.78 times higher than that of carburized layer under different kinds of sand paper wear respectively, the wear resistance of boron iron B-C, B-C-N-S and boron carbide B-C and B-C-N-S composite layer was 4.01-5.21 times higher than that of carburized layer, 2.44-3.25 times and 1.46-1.78 times higher than that of carburizing layer, respectively. The relative wear resistance is 1.89-4.01 times higher than that of carburized layer, 1.09-1.29 times and 1.54-2.47 times respectively 1.29-1.46 times. Wear resistance test: under dry friction conditions, the relative wear resistance of the corresponding composite carburized layer is 1.38-1.59 times higher than that of the carburized layer, 2.91-3.34 times 1.16-1.46 times and 3.92-4.54 times, the friction coefficient is reduced from 0.846 to 0.6870.5000.7530.424, respectively, under the oil friction condition, the wear resistance of the composite layer is increased by 1.38 to 1.59 times than that of the carburized layer, and the friction coefficient is decreased from 0.846 to 0.7530.424, respectively. The relative wear resistance of the corresponding composite layer is 1.38-1.91 times higher than that of the carburized layer, respectively 2.93-4.03 times 1.21-1.41 times 5.48-6.45 times, and the friction coefficient is reduced from 0.596 to 0.412 ~ 0.198 0.198 0.4944.155 respectively. The wear resistance of B-C composite boronizing layer is the best, and that of boronizing agent B-C-N-S composite layer is the best. The preparation of B-C and B-C-N-S composite carburizing layer on the surface of carburized parts can improve the wear resistance of carburized parts, which is worthy of further study, so that it can be applied to the practical production of three-cone bit.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P634.41

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