论文部分内容阅读
高速钢在淬火后,需要进行多次高温(550～570℃保温一小时)回火。回火的目的是要减少钢中的内应力、提高韧性、防止工具在工作时发生崩刃、脆断以及变形和裂纹的现象;淬火高速钢中的残留奥氏体对工具的强度尺寸稳定性及刀具的导热性不利,因此回火时必须将残留奥氏体转交马专氏体。需要多次回火的另一目的是使淬火后高合金化的基体中析出过饱和的合金元素使其形成高度弥散性的炭化物而获得次生硬化。总之,高速钢在淬火后加以回火的目的就在于提高它的机
High-speed steel after quenching, the need for multiple high temperature (550 ~ 570 ℃ insulation one hour) tempering. The purpose of tempering is to reduce the internal stress in the steel to improve the toughness and prevent the tool from collapsing, brittle fracture and deformation and cracking during working. The strength and dimensional stability of the retained austenite in the quenched high-speed steel to the tool And the thermal conductivity of the cutter is unfavorable, so the residual austenite must be transferred to the martensite when tempering. Another object of the need for multiple tempering is to achieve secondary hardening by precipitating supersaturated alloying elements in a highly alloyed matrix after quenching so that it forms a highly dispersible carbide. In short, high-speed steel in the tempering after quenching the purpose is to improve its machine