摘要
将酸洗和未经酸洗的两种20CrMnTi钢试样放在一起进行渗碳淬火、回火处理。分别测定了两种试样表层的碳浓度梯度和淬硬层深度。结果表明,在相同的热处理工艺条件下,经酸洗后的试样,淬硬层和渗层碳浓度均较未经酸洗的试样高。原因是酸洗试样的表面产生了过酸洗和酸洗麻点,增大了试样表面与气氛的接触面积,在渗碳初期,酸洗试样表面渗入的碳原子多,形成了从表面到心部比较高的碳浓度梯度,从而提高了碳的扩散速度。
20CrMnTi steel samples acid soaked and non-soaked were carburized and tempered. Gradient of carbon concentration and case depth in the samples were inspected. The results show that the surface carbon concentration and case depth of the acid soaked samples are higher than that of the non-acid soaked samples for the same heat treatment process. That is because of many corrosion pits existed in surface of the acid soaked samples ; by which the contacting area in the carburizing atmosphere can be increased at the beginning of the carburizing process, compared to non-soaked samples, the more carbon atom diffuse into surface of the acid soaked samples, and the high gradient of carbon concentration between surface and core is formed.
出处
《金属热处理》
CAS
CSCD
北大核心
2012年第10期115-118,共4页
Heat Treatment of Metals
关键词
酸洗
碳浓度
淬硬层
渗碳
acid soaking
carbon concentration
case depth
carburizing
