1Cr13不锈钢硼-碳复合渗工艺及其性能

Boron-carburizing process of 1Cr13 stainless steel and its properties

对1Cr13马氏体不锈钢进行950℃预渗碳6 h复合不同渗硼工艺处理,通过光学显微镜(OM)、扫描电镜(SEM)及配套能谱分析仪(EDS)、显微维氏硬度计、XRD、电化学工作站等研究了复合渗工艺以及最终热处理对硼碳复合渗层组织和性能的影响。结果表明,1Cr13钢最佳硼碳复合渗工艺为950℃固体渗碳6 h复合950℃固体粉末渗硼6 h,在此工艺下,渗硼层硬度高达1436 HV0.1,交界层硬度为924 HV0.1,预渗碳层硬度为630~910 HV0.1,基体心部硬度为560~590.7 HV0.1,复合渗层硬度梯度整体较为平缓。EDS检测得出交界层Cr元素含量最高,其质量分数为13.49%。XRD物相检测得出渗硼层中主要是硬度高且脆性较小的Fe_(2)B相,存在少量FeB和CrB相。复合渗试样与原样的腐蚀电极电位相比提升了0.104 V,硼碳复合渗工艺提高了1Cr13不锈钢的耐腐蚀性能。

Pre-carburizing at 950 ℃ for 6 h and different boronizing processes for martensitic stainless steel 1Cr13 were carried out. Effects of composite infiltration process and final heat treatment on microstructure and properties of boron-carburized layer were studied by means of optical( OM),scanning electron microscope( SEM),energy spectrum analysis( EDS),microscopic Vickers hardness tester,XRD,electrochemical workstation. The results show that the optimum boron-carburizing process of 1Cr13 steel is carburizing at 950 ℃ for 6 h then boronizing at 950 ℃ for 6 h. Under this process,the surface hardness of boron-carburized layer is up to 1436 HV0. 1,the hardness of the interface layer is 924 HV0. 1. Pre-carburized layer hardness is 630-910 HV0. 1 and the core hardness is 560-590. 7 HV0. 1. The hardness gradient of composite infiltration layer is relatively gentle on the whole. EDS results show that the interface layer have the highest Cr content,and it’s mass fraction is 13. 49%. XRD results show that the boronized layer is mainly Fe2B phase with high hardness and low brittleness,and there are a few Fe B and Cr B phases. The corrosion potential of the boron-carburized specimen is increased by 0. 104 V compared with the original specimen,and the corrosion resistance of the steel is improved by the boron-carburizing process.