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首页> 外文期刊>Applied Surface Science >The surface alloying behavior of martensitic stainless steel cut with wire electrical discharge machine
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The surface alloying behavior of martensitic stainless steel cut with wire electrical discharge machine

机译：电火花线切割机切割马氏体不锈钢的表面合金化行为

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摘要

The surface alloying behavior of tempered martensitic stainless steel multi-cut with wire electrical discharge machine (WEDM) is studied in this paper. Before machined with WEDM, the steel specimens were quenched at 1050℃ and then tempered at 200℃, 400℃, and 600℃, respectively. The microstructure and surface morphology of the multi-cut surfaces were examined with scanning and transmission electron microscopes integrated with an energy-dispersive X-ray spectrometer for chemical composition analysis. Experimental results show that the cut surfaces of the steel specimens were alloyed with wire-electrode material in various extent. Especially the cut surface was much more alloyed when the steel was cut with the first rough cutting pass by using negatively biased potential and final fine cutting using positively biased potential. Alloying degree of cut surfaces can be distinguished with their anodic polarization curves in 0.5 M HClO_4 + 0.2 wt% NaCl at 27℃. Higher passive current density induces deeper alloyed surface. On the severely alloyed surface, a secondary anodic peak in the potential of 120 mV (versus Ag/AgCl_(sat.)) of its anodic polarization curve was observed. The presence of the secondary anodic peak was attributed to dissolution of copper, which was the major element of wire-electrode material from the alloyed surface.
机译：研究了回火马氏体不锈钢多线丝放电加工机（WEDM）的表面合金化行为。在用WEDM进行机械加工之前，将钢试样在1050℃淬火，然后分别在200℃，400℃和600℃回火。用集成了能量色散X射线光谱仪的扫描和透射电子显微镜检查多切口表面的微观结构和表面形态，以进行化学成分分析。实验结果表明，钢试样的切割表面在不同程度上与线电极材料形成了合金化。尤其是，当使用负偏电势对钢进行第一次粗切削时，使用正偏电势对最终精切削进行切削时，切削表面的合金化程度更高。切割表面的合金化程度可以通过在27°C下在0.5 M HClO_4 + 0.2 wt％NaCl中的阳极极化曲线来区分。无源电流密度越高，合金表面越深。在严重合金化的表面上，观察到其阳极极化曲线的电势为120 mV（相对于Ag / AgCl_（sat。））的次要阳极峰。次级阳极峰的存在归因于铜的溶解，铜是合金表面上电极材料的主要元素。

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