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程义远, 王勇, 绳以健, 陈延坤, 薛敏鹏. 35CrMoA钢激光淬火/渗氮层中氮分布及耐蚀性分析[J]. 焊接学报, 2011, (1): 69-72,76.
引用本文: 程义远, 王勇, 绳以健, 陈延坤, 薛敏鹏. 35CrMoA钢激光淬火/渗氮层中氮分布及耐蚀性分析[J]. 焊接学报, 2011, (1): 69-72,76.
CHENG Yiyuan, WANG Yong, SHENG Yijian, CHEN Yankun, XUE Minpeng. Investigation on nitrogen distribution and corrosion resistance of 35CrMoA steel in laser quenching-nitriding[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2011, (1): 69-72,76.
Citation: CHENG Yiyuan, WANG Yong, SHENG Yijian, CHEN Yankun, XUE Minpeng. Investigation on nitrogen distribution and corrosion resistance of 35CrMoA steel in laser quenching-nitriding[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2011, (1): 69-72,76.

35CrMoA钢激光淬火/渗氮层中氮分布及耐蚀性分析

Investigation on nitrogen distribution and corrosion resistance of 35CrMoA steel in laser quenching-nitriding

  • 摘要: 对35CrMoA钢进行激光淬火/渗氮复合处理,采用SEM,XRD,EPMA,M352腐蚀系统研究了激光淬火/渗氮层的显微组织、物相、N元素分布及耐蚀性,并与气体渗氮层对比.结果表明,激光淬火/渗氮化合物层中ε-Fe3N含量较高,ζ-Fe2N相较低,表面氮浓度较低,渗氮层中氮分布较均匀,氮浓度降低趋势平缓,普通渗氮层表面氮浓度较高,氮浓度陡降.激光淬火后表层晶粒细小,晶界及位错增多,使γ'相双向溶解速率大于ε相储氮速率,ε相和γ'相的阻碍扩散作用降低,白亮层厚度减小,渗氮层厚度增加.激光淬火/渗氮层中Ecorr值较气体渗氮层提高,自腐蚀电流由普通渗氮层的57.68μA/cm2减小到激光/渗氮层的3.166μA/cm2,其耐蚀性提高.

     

    Abstract: Laser quenching and nitriding treatment had been performed on 35CrMoA steel,and the microstructure,phase,nitrogen distribution and corrosion resistance of laser quenching/nitrided layer were investigated by means of SEM,XRD,EPMA,and compared with the gas nitrided layers.The results show that the content of ε-Fe3N is higher in the laser quenching/nitrided layer while the content of the brittle ζ-Fe2N is lower than that of the gas nitrided layer.The density of N in the surface is lower compared with that of the gas nitrided layers,and the density of N in the surface of laser quenching/nitrided layer declines slowly while drops sharply in the gas nitrided layers.By laser quenching,grain size becomes small,and dislocations increase,which make the bidirectional dissolution rate of γ' phase be faster than the hydrogen storage rate of ε phase,and ε and γ' phase's hindrance on diffusion is faded,with the results that the thickness of compound layer decreases,and the thickness of nitrided layer increases.Ecorr of laser quenching/nitriding layer was improved comparing with gas nitriding while Icorr decreases from 57.68 μA/cm2 of gas nitriding layer to 3.166 μA/cm2 of composite nitriding layer.As a result,its corrosion resistance was improved significantly.

     

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