三种不同介质下H13钢电火花表面强化研究
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摘要
在煤油、雾和混AL粉准干式工作介质中对H13钢进行电火花表面强化,以钛合金为工具电极,并对强化层的微观组织、厚度及硬度进行了分析。分析结.果表明,在3种不同工作介质条件下获得的强化层组织均呈橘皮状,且强化层截面由表及里依次由白亮层、过渡层和基体组成。在混AL粉准干式介质条件下的强化层表面更平整,组织更致密,且强化层的厚度比雾和煤油工作介质条件下的厚度要高,分布也更均匀。强化层的硬度较基体H13钢均有大幅提高,且在混AL粉准干式工作介质条件下的平均显微硬度明显高于雾状和煤油介质条件下的强化层硬度。
The surface of H13 steel was investigated by means of electro spark surface strengthening in kerosene, fog and mixed AL powder. The microstructure, thickness and hardness of the strengthened layer were analyzed. The analysis results show that the obtained in 3 different working medium under the condition of strengthening layer was orange peel, and the strengthening layer section from the outside to the inside followed by the white layer, transition layer and matrix com-position. Under the condition of mixed AL powder, the surface of the strengthened layer is more smooth, the structure is more compact, and the thickness of the strengthened layer is much higher than that of fog and kerosene working medium, and the distribution is more uniform. The average micro hardness of the mixed AL powder was higher than that of the mist and kerosene medium.
The surface of H13 steel was investigated by means of electro spark surface strengthening in kerosene, fog and mixed AL powder. The microstructure, thickness and hardness of the strengthened layer were analyzed. The analysis results show that the obtained in 3 different working medium under the condition of strengthening layer was orange peel, and the strengthening layer section from the outside to the inside followed by the white layer, transition layer and matrix com-position. Under the condition of mixed AL powder, the surface of the strengthened layer is more smooth, the structure is more compact, and the thickness of the strengthened layer is much higher than that of fog and kerosene working medium, and the distribution is more uniform. The average micro hardness of the mixed AL powder was higher than that of the mist and kerosene medium.
引文
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[2]何柏林.模具材料及表面强化技术.北京化学工业出版社,2009.
[3]张春辉,马红岩,王茂才.钛合金表面强化新进展[J].钛合金工业进展,2003,20(4/5):49-52.
[4]汤精明,乔生儒.两种钢铁材料电火花表面强化层组织结构研究[J].热加工工艺,2006,35(20):19-21.
[5]Mohri N,Saito N,TSunekawa Y.Metal surface modification byelectrical discharge machining with composite electrodes[J].Annals of the CIRP.1993,42(l):219-222.
[6]Furutani K,Saneto A,Takezawa H,et.al.Accretion of titanium carbide byelectrical discharge machining with powder suspended in working fluid.Journal of the International Societies for Precision Engineering and Nanotechnology[J].2001,25:138-144.
[7]张明,李福杰.电火花成型机床空气中放电沉积试验研究[J].工具技术.2009,43(6):40-42.
[8]TANIMURA T,ISUZUGAW K,JITAI,etal.Develop-ment of EDM in the mst[J].Proc.ISEM,1989(9):313-316.
[9]L.Gu,W.S.Zhao,L.Li,Y.G Xia.K.P.Rajurkar.Electrical Discharge.Machining in Jetted Mist[C].ISEM X V,Pittsburgh,USA,2007.Nebraska:Industrial and Management Systems Engineering,2007:297-300.
[10]顾琳,赵万生,张志华,康小明.喷雾电火花铣削加工及其机理的分析[J].电加工与模具.2006,2:1-4.
[11]李利,顾琳,夏永高,赵万生.内喷雾式电火花铣削加工的实验研究[J].上海交通大学学报.2007,41(10):1569-1572.
[12]白雪,张勤河,李田田,等.混粉准干式电火花加工介质击穿机理研究[J].机械工程学报,2012.48(7):186-192.
[13]Kunieda M,Furuoya S.Improvement of EMD efficiency by sup-plying oxygen gas into gap[J].Annals of the CIRP,1991,40(1):215-218.