电子束熔炼对高速钢碳化物的影响

细小而弥散分布的碳化物是高速钢优良性能的保证,但复杂的合金成分导致铸态高速钢中碳化物粗大、偏析严重.为了探究电子束熔炼对铸态高速钢的影响,改善高速钢中的组织及碳化物状态,采用电子束熔炼技术制备M35高速钢,并对其成分、组织等进行了表征.结果表明,EBM-M35高速钢中平均枝晶间距为20 μm,碳化物尺寸细小,在组织中均...

Effect of electron beam melting on carbide of high speed steel

The fine and dispersed carbides are the guarantee of the excellent performance of high-speed steel,but the complex alloy composition leads to coarse carbides and severe segregation in the as-cast high-speed steel.In order to explore the effect of electron beam melting on as-cast high-speed steel and improve the structure and carbide state of high-speed steel,electron beam melting technology to prepare M35 high-speed steel and characterize its composition and structure was used.The results show that the average dendrite spacing in EBM-M35 high-speed steel is 20μm,the size of carbides is fine,and they are evenly distributed in the structure.The main types are MC and M2C,and the M2C carbides change from lamellar to fibrous.During heat treatment of as-cast EBM-M35 high-speed steel,it was found that the carbide fractured and spheroidized after being kept at 1 180℃for 30 min to achieve the effect of refining the carbide and dispersing the carbide in the structure.Furthermore,the fracture and spheroidization of carbides in EBM-M35 high-speed steel can be completed at a lower temperature or shorter heat treatment time,and the microstructure optimization of as-cast high-speed steel can be completed at a lower cost.It provides a more excellent basis for the deformation and refinement of as-cast high-speed steel.