切削2.25Cr—1Mo钢刀—屑间的粘焊破损机理

借助电镜及金相显微镜，分析了多种硬质合金刀具切削２．２５Ｃｒ－１Ｍｏ钢时刀具的粘焊破损行为。结果表明，在重型切削条件下，刀－屑间局部区域里，通过双方原子间的扩散和再结晶，已完全达到了固相焊接的程度；被加工材料与硬质合金元素间的亲合力强、切削力大、切削温度高是产生刀－屑间冶金联接的主要原因，选用超细晶粒硬质合金刀具是解决粘刀问题的途径之一。

Research on Mechanism of Adhering between Chip and Tool Cutting 2.25Cr-1Mo Steel

The adhering fracture behaviour of some carbide alloy tool in cutting 2.25Cr-1Mo steel has been researched. By SEM and metallscope, it was found that the solid welding has been done in some areas between tool and chip by solid diffussion or recrystallization across the interface under the condition of heavy cutting. The reason for forming metalic bonding is the stronger attraction between atoms of the tool and worked material, the greater cutting force and higher cutting temperature in cutting process.