The Effect of Ni Element Mass Fraction on the Performance of 65Mn Steel Woodworking Circular Saw Blades
High-quality and efficient wood cutting processes are of significant importance for improving the utilization rate of wood resources and enhancing the quality of wooden products.Currently,the commonly used steel 65Mn for woodworking circular saw blades has issues with subpar mechanical properties such as hardness and tensile strength.To address this,nickel was added to modify the 65Mn steel.The Ni-modified 65Mn steel was prepared through steps including raw material smelting,casting test bars,forging processing,and heat treatment.Microhardness,impact toughness,and tensile strength tests were conducted on the 65Mn steel before and after modification.Additionally,the organizational differences of 65Mn steel before and after modification were ana-lyzed using Metallographic microscopes and Scanning Electron Microscopes(SEM).The results of the study indicated that,1)after adding Ni elements,the tempered structure of 65Mn steel changed from tempered troostite to a mixture of quenched martensite and tempered martensite,and when the mass fraction of Ni reached 0.9%,residual austenite appeared.2)Under the same heat treatment conditions,the effect of Ni elements on the hardness and tensile strength of the material showed a trend of first increasing and then de-creasing,with the impact toughness being lower than that of unmodified 65Mn steel.The hardness and tensile strength of the 65Mn steel with a mass fraction of 0.7%Ni were optimal,increasing by 10.18%and 35.40%,respectively compared to unmodified 65Mn steel(at room temperature).This research findings provides new ideas and methods for the subsequent improvement of woodworking circular saw blade steels and is expected to promote further development in the wood processing tools industry.
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