摘要
为了提高热作模具钢H13的性能,延长模具的使用寿命,本试验将表面机械研磨(SMA)处理与等离子渗硼相结合。通过显微金相技术、扫描电子显微分析技术(SEM)、X射线衍射分析技术(XRD)以及辉光放电发射光谱技术(GDOS)分别对H13钢渗硼后的渗层厚度、表面相组成以及元素逐层分布情况进行了探讨。研究结果表明在650℃×3h等离子渗硼处理后,纳米化表面便有Fe_2B相出现,次表面为扩散层,总渗入深度为30μm左右;在700℃×3h条件下,出现了Fe_2B和FeB的双相组织。而对于原始表面,在650℃×3h处理后表面没有任何硼化物出现,只产生了一定的扩散层。最终提出了表面纳米化之后实施低温渗硼的新型工艺。
In order to improve the properties of hot work steel H 13 and prolong the working life of moulds, surface mechanical attrition treatment （SMAT） was combined with plasma boriding. By means of micro-metallography technology, SEM, XRD and GDOS, the thickness and phase composition of the boride layer and the element distribution along the depth were investigated. Results showed that after plasma boriding at 650℃ for 3h, Fe2B phase appeared on the nano-structured surface and there was a diffusion layer under it. The total boriding depth was 30μm. With the temperature rising to 700℃, besides FeB, Fe2B was also observed on the nano-structured surface. For original surface, no obvious boride but diffusion layer was noticed after plasma boriding at the condition of 650℃×3h. Finally a new method of low temperature boriding after surface nano-structured treatment was proposed.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2007年第B08期154-157,共4页
Transactions of Materials and Heat Treatment
基金
上海市重点学科建设项目(T0101)
国家教委博士点专项基金资助(2006028006)。
关键词
表面机械研磨处理
等离子渗硼
渗层结构
surface mechanical attrition treatment, plasma boriding, the structure of bofiding layer
