添加钒氮合金对M2高速钢凝固组织与硬度的影响  

The addition of anadium and nitride alloy on the solidification structure and hardness of M2 high-speed steel

作　　者：商光敏 刘宏玉[1,2] 邓玮杰 李游 孙渤翔 李锐霖 Shang Guangmin;Liu Hongyu;Deng Weijie;Li You;Sun Boxiang;Li Ruilin(College of Science,Wuhan University of Science and Technology,Wuhan 430065,Hubei,China;Hubei Province Key Laboratory of Systems Science in Metallurgical Process,Wuhan 430065,Hubei,China;Hubei Shili Mold Materia Company Limited,Ezhou 436055,Hubei,China)

机构地区：[1]武汉科技大学理学院,湖北武汉430065 [2]冶金工业过程系统科学湖北省重点实验室,湖北武汉430065 [3]湖北时力模具材料有限公司,湖北鄂州436055

出　　处：《钢铁钒钛》2024年第2期182-189,共8页Iron Steel Vanadium Titanium

摘　　要：为充分利用钒氮合金和深入研究其在高速钢中的作用,在化学成分满足高速钢标准GB/T 9943-2008的前提下,采用快速凝固熔样机试验研究了添加钒氮合金后,M2高速钢凝固组织与硬度的变化规律。使用Thermo-Calc、JMatPro软件和光学显微镜、扫描电镜、X射线衍射仪、硬度仪,对不同N含量(0.036 5%,0.016 5%)的M2高速钢凝固后不同位置的基体晶粒形态、尺寸和分布,碳化物类型、形态、尺寸和分布以及硬度变化进行了计算与分析。结果表明,钒氮合金的添加有利于基体晶粒尺寸的细化,0.036 5%N试验钢在中心、1/2半径和边缘处均为等轴晶;0.016 5%N试验钢在1/2半径出现柱状晶。钒氮合金的添加没有改变凝固过程中碳化物的析出类型,但有利于碳化物的细碎化。添加钒氮合金使得试验钢硬度升高,0.036 5%N钢硬度的升高归因于基体晶粒的细化和M(C, N)数量的增加。In order to fully exploit the potential role of vanadium-Nitride alloy on high-speed steel,the evolution of solidification structure and hardness of M2 high-speed steel with vanadium-Nitride alloy addition had been investigated by using a rapid solidification melt-sampling apparatus,where the vanadium-nitride alloy was added into the standard M2 high-speed steel specified by GB/T 9943-2008,an experimental exploration was conducted.Thermo-Calc and JMatPro software,in combination with optical microscopy,scanning electron microscopy,X-ray diffraction apparatus,and hardness tester,were employed for the observation of substrate grain morphologies,sizes,and distributions at various locations subsequent to the solidification of M2 high-speed steel with different N content(0.0365%,0.0165%).Additionally,observations were made on carbide types,morphologies,sizes,and distributions,while hardness variations were measured.The results indicate that the addition of vanadium-nitride alloy can help refining the size of substrate grains.In the case of the 0.0365%N experimental steel,equiaxed grains were observed at the center,1/2 radius,and periphery;whereas the 0.0165%N experimental steel exhibited columnar grains at 1/2 radius.The addition of vanadium-nitride alloy could not alter the precipitation type of carbides during the solidification process,but it facilitated the fragmentation of carbides.The addition of vanadium-nitride alloy resulted in higher hardness.The increased hardness in the case of the 0.0365%N experimental steel is attributed to the refinement of substrate grains and an augmented quantity of M(C,N)particles.

关 键 词：M2高速钢 钒氮合金 凝固组织 碳化物 硬度 

分 类 号：TF76[冶金工程—钢铁冶金] TG142.1[一般工业技术—材料科学与工程]