直流电场对35钢盐浴碳氮共渗技术的影响  

Effect of direct current field on salt bath nitrocarburizing of 35 steel

作　　者：周正寿[1] 解后润 魏国方[1,2] 胡静[1] 

机构地区：[1]常州大学江苏省表面工程技术重点实验室,江苏常州213164 [2]常州市武进广宇热处理有限公司,江苏常州213134

出　　处：《材料热处理学报》2015年第1期187-191,共5页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51271039);江苏省研究生创新基金(SCZ100431322)

摘　　要：以35钢为材料,研究了添加直流电场盐浴碳氮共渗技术。该技术在碳氮共渗盐浴中通过在被渗样品间施加合适参数的直流电场予以实现。分析了渗层的显微组织及白亮层厚度,测量了渗层硬度沿层深的分布,并进行了物相分析。实验结果表明:直流电场可以显著提高碳氮共渗速度;在碳氮共渗温度575℃,保温50 min,添加强度为7.5 V的直流电场时,白亮层厚度可以达到18.4μm,约是常规盐浴碳氮共渗获得白亮层厚度的两倍;电场快速盐浴碳氮共渗后试样表面硬度达到730 HV0.01;同时对电场快速盐浴碳氮共渗机理进行了讨论。Process of direct current field( DCF) assisted salt bath nitrocarburizing process of 35 steel was developed by applying a DCF between the treated samples in the nitrocarburizing salt bath. The microstructure and micro-hardness distribution of the nitrocarburized specimens were studied. The thickness of the white bright layer of the specimens was measured. The results show that DCF can significantly promote the salt bah nitrocarburizing of 35 steel. The nitrocarburizing time of the specimen with the white bright layer of 18. 4μm nitrocarburized at 575 ℃ in the DCF of 7. 5 V decreases by a factor of two compared with that of the conventionaly nitrocarburized specimen with the similar white bright layer. Surface hardness of the specimen can reach 730 HV0. 01 after salt bath nitrocarburizing in DCF. Moreover,the catalyzing mechanism of DCF for salt bath nitrocarburizing process is discussed.

关 键 词：盐浴碳氮共渗 直流电场 显微结构 硬度 机理 

分 类 号：TG156.82[金属学及工艺—热处理]