Mn合金化及超高温热处理对CADI磨球组织和性能影响  

Effects of Mn Alloying and Ultra-high Temperature Heat Treatment on Structure and Properties of CADI Grinding Balls

作　　者：牛城毅 游志勇[1] 蒋傲雪 张腾 张明宝 NIU Chengyi;YOU Zhiyong;JIANG Aoxue;ZHANG Teng;ZHANG Mingbao(School of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024;Shanxi Longyu Wear-Resistant Material Technology Co.,Ltd.Lüliang 033507)

机构地区：[1]太原理工大学材料科学与工程学院,太原030024 [2]山西龙宇耐磨材料科技有限公司,吕梁033507

出　　处：《特种铸造及有色合金》2025年第2期305-309,共5页Special Casting & Nonferrous Alloys

基　　金：山西省吕梁市校地合作重点研发专项资助项目(2023XDHZ15)。

摘　　要：含碳化物等温淬火球墨铸铁(CADI)磨球具有高硬度和高耐磨性,但是冲击韧度较低,在实际工况应用中会发生破碎致其失效。通过Mn合金化和1100℃超高温热处理的方法改善CADI磨球的微观组织及力学性能。结果表明,CADI磨球的组织主要由球状石墨、碳化物、针状铁素体和残余奥氏体组成。随着Mn含量增加,CADI磨球中的(Fe,Mn)_(3)C含量增加,尺寸变大,表面和心部硬度先增加后减少,冲击韧度降低,(Fe,Mn)_(3)C由条状变为网状。当Mn含量为2.1%时,表面和心部硬度(HRC)分别为56和54,冲击韧度为4.5 J/cm^(2),磨损量为0.9 mg。超高温热处理后,CADI磨球中的(Fe,Mn)_(3)C溶解,尺寸细小,硬度增加,冲击韧度增加;当Mn含量为2.1%时,表面和心部硬度(HRC)分别为59和56,冲击韧度为6.8 J/cm^(2),磨损量为0.7 mg。Carbidic Austempered Ductile Iron(CADI)grinding ball exhibits high hardness and high wear resistance and low impact toughness,which is easily broken and leads to failure in practical application.The microstructure and mechanical properties of CADI ball were improved by Mn alloying and 1100℃ultra-high temperature heat treatment.The results indicate that the microstructure of CADI ball is mainly composed of spherical graphite,carbide,acicular ferrite and residual austenite.With the increase of Mn content,the content of(Fe,Mn)_(3)C in CADI mill ball is increased with the larger size.In addition,the surface and core hardness is increased firstly and then decreased,and the impact toughness is decreased,since(Fe,Mn)_(3)C is transformed from strip to network.When Mn content is 2.1%,the surface and core hardness are 56 HRC and 54 HRC,respectively.The impact toughness is 4.5 J/cm^(2),and the wear amount is 0.9 mg.After ultra-high temperature treatment,the content of(Fe,Mn)_(3)C in CADI mill ball is reduced with a smaller size,and the hardness and impact toughness are increased.With 2.1%Mn content,the surface hardness and core hardness are 59 HRC and 56 HRC,respectively.The impact toughness is 6.8 J/cm^(2)and the wear amount is 0.7 mg.

关 键 词：CADI磨球 超高温热处理 锰 冲击韧度 

分 类 号：TG164.2[金属学及工艺—热处理] TG143.5[金属学及工艺—金属学]