CAJ | 학술논문

对35CrMoA钢进行激光淬火一渗氮复合处理,采用XRD、SEM、TEM及M352腐蚀系统研究了激光淬火/渗氮层的组织、相组成、耐蚀性能,并与气体渗氮层对比.结果表明,两种渗氮层均由ε相、γ'相及Cr_2N相组成.激光淬火/渗氮白亮层中ε-Fe_3N含量较高,而脆硬的ζ-Fe_2N相及Fe_2O_3含量较低,白亮层厚度由气体渗氮层的25μm降为激光淬火/渗氮的12μm,其致密度增加;激光淬火/渗氮层中E_(corr)值较气体渗氮的提高,自腐蚀电流由气体渗氮的57.68 μA/cm~2减小到激光/渗氮的3.166 μA/cm~2,其耐蚀性提高.
대35CrMoA강진행격광쉬화일삼담복합처리,채용XRD、SEM、TEM급M352부식계통연구료격광쉬화/삼담층적조직、상조성、내식성능,병여기체삼담층대비.결과표명,량충삼담층균유ε상、γ'상급Cr_2N상조성.격광쉬화/삼담백량층중ε-Fe_3N함량교고,이취경적ζ-Fe_2N상급Fe_2O_3함량교저,백량층후도유기체삼담층적25μm강위격광쉬화/삼담적12μm,기치밀도증가;격광쉬화/삼담층중E_(corr)치교기체삼담적제고,자부식전류유기체삼담적57.68 μA/cm~2감소도격광/삼담적3.166 μA/cm~2,기내식성제고.
Through composite treatment of laser quenching and nitrided on 35CrMoA steel, the influence of laser surface pretreatment on microstructure, phase composition and corrosion resistance of the nitrided layer were studied by XRD, SEM, TEM and M352 electrochemistry corrosion system. The results show that the composite nitrided layer is composed of ε, γ' and Cr_2N and so on. The content of ε-Fe_3N is higher in the laser quenching/nitrided white layer, while the content of the brittle ζ-Fe_2N and Fe_2O_3 is lower than that of the gas nitrided layer, the depth of white layer decreasing from 25 μm of gas nitrided layer to 12 μm of composite nitrided layer resulting in the increase of density. E_(corr) of laser quenching/nitriding layer improves comparing with gas nitriding while I_(corr) decreases from 57.68 μA/cm~2 of composite nitriding layer to 3.166 μA/cm~2 of gas nitriding layer. As a result, its corrosion resistance improves significantly.