304奥氏体不锈钢交流电场增强粉末法渗硼研究  

Study on alternating current field enhanced pack boronizing on 304 austenitic stainless steel

作　　者：曹鸣超 谢飞 CAO Mingchao;XIE Fei(School of Materials Science and Engineering,Changzhou University,Changzhou 213164,China;Jiangsu Key Laboratory of Materials Surface Science and Technology,Changzhou University,Changzhou 213164,China)

机构地区：[1]常州大学材料科学与工程学院,江苏常州213164 [2]江苏省材料表面科学与技术重点实验室(常州大学),江苏常州213164

出　　处：《常州大学学报(自然科学版)》2025年第2期10-16,共7页Journal of Changzhou University:Natural Science Edition

基　　金：国家自然科学基金资助项目(51171032)。

摘　　要：采用不同硼铁质量分数(3%~15%)的渗硼剂,对304奥氏体不锈钢(ASS)于800℃进行交流电场(ACF)增强粉末法渗硼。通过X射线衍射分析、光学显微观察以及显微硬度测试,研究渗层的相结构、显微组织、显微硬度分布。结果表明:304 ASS渗硼层由外侧FeB+Fe_(2)B+CrB+NiB层和内部过渡区构成,过渡区主要相为CrB和NiB;ACF对304 ASS粉末法渗硼有显著促渗作用,促渗随ACF电流增加而增加;促渗效果还与渗剂中的硼铁质量分数有关,渗剂中硼铁质量分数由3%增加至10%,试样的渗层厚度明显增加,硼铁质量分数由10%继续增加至15%,渗层厚度则又减小;渗扩中施加ACF还提高渗层峰值硬度和渗层整体硬度,使渗层硬度沿层深的分布更加平缓。The 304 austenitic stainless steel(ASS)was pack boronized enhanced by alternating current field(ACF)at 800℃using boronizing agents with different ferroboron content(3%—15%).X-ray diffraction analysis,optical microscopy and microhardness testing were used to investigate the phase,microstructure and microhardness distribution of the treated layer.Experimental results show that the obtained boronizing layer of 304 ASS is composed of the outer FeB+Fe_(2)B+CrB+NiB layer and the inner transition zone.Main phases in the transition zone are CrB and NiB.The ACF can significantly promote the pack boronizing to 304 ASS,which increases with the increase of the ACF current.The promotion effect is also related to the content of ferroboron in the pack boronizing agent.With the increase of ferroboron content in the pack agent from 3%to 10%,the case thickness of the treated sample increases significantly.However,the case thickness decreases when the content of ferroboron increases further from 10%to 15%.The application of ACF in the pack boronizing also improves the case s peak hardness and the overall hardness,making the hardness distribution of the boronizing layer more gentle along the case depth.

关 键 词：奥氏体不锈钢 交流电场 渗硼 

分 类 号：TG156.8[金属学及工艺—热处理]