摘要
作者研究了高合金渗碳钢中针状碳化物的形貌及显微结构,描述了针状碳化物的典型形貌。认为这是一种含有少量合金元素的(Fe.M)_3C型碳化物,其母相为残留奥氏体。二者的位向符合Pistch关系。针状碳化物可以在晶界和晶内形核。其生长沿残留奥氏体的一定晶面进行。观察发现针状碳化物是由许多"小节"构成的,对此以前未见过有关报导。作者认为碳化物针的生长是靠不断形成新的"小节"实现的。
In this paper,the microstructure and the formation mechanismof the acicular carbide in high alloy steel have been studied.The typical pa-tterns of the carbide are discribed.It is proved that the carbide is(Fe,M)(?)with a little alloy elements,the matrix is retained austenite and the orien-tation relationship between the carbide and its matrix obeys pistch one.Thisacicular carbide can nuclei either at grain boundary or inside of retained aus-tenite.With TEM,it is discovered that the carbide cnosists of'small step'.The authors suppose that the growth of the carbide depends on the forming of'small step'continuously.
出处
《金属热处理》
CAS
CSCD
北大核心
1990年第1期20-23,共4页
Heat Treatment of Metals
关键词
合金钢
渗碳钢
碳化物
显微结构
microstructure
formation mechanism
acicular carbide
high alloy steel.
