【摘要】 本文研究了碳钢渗硼层中Fe₂B和FeB的含量和择尤取向与渗硼时间、层深及渗剂B₄C含量之间的关系。实验结果表明:在850℃渗硼时,无论渗剂B₄C含量如何变化,均首先生成Fe₂B,随后再生成FeB,两者生成的时间间隔随渗剂B₄C含量的升高而缩短。渗硼初期生成的Fe₂B和FeB无择尤取向现象,随着渗硼时间的延长和层深的加厚,Fe₂B和FeB的[002[晶向与工件表面垂直的择尤取向程度加大,超过一定层深后,[002]晶向几乎全都与工件表面垂直。更多还原

【Abstract】 The present paper deals with the influence of boronizing time, layer depth and the B₄C content in the boronizer on the content of Fe₂B and their preferred orientations in the boronized layer of a medium carbon steel. The experimental results show that when boronized at 850℃, in spite of the variation on B₄C content in the borcnIzer, the formation of Fe₂B always preceeds that of FeB, The time interval required for the formation of FeB and Fe₂B shortens as the B₄C content in the borcnizer increases. No preferred orientation in Fe₂B and FeB formed in the initial stage of boronizing was observed. As the boronizing time is increased, the boroized layer thickens, and the extent of the preferred crientation characterized by [002] dirrection taking the direction perpendicularto the specimen surface gradually increases. After the layer thickness exceeds a certain value, the [002] direction almost takes entirely tie perpendicular to the specimen surface.更多还原