多元共渗时间对45CrMoV钢耐磨性和耐蚀性的影响  

Effect of multi-component thermochemical treatment time on wear resistance and corrosion resistance of 45CrMoV steel at low temperature

作　　者：张汉兵[1] 江天波[1] 杨尚广 崔国栋[1] 

机构地区：[1]西南交通大学材料科学与工程学院,四川成都610031

出　　处：《金属热处理》2013年第10期62-65,共4页Heat Treatment of Metals

基　　金：国家大学生创新训练计划(111061301)

摘　　要：采用气体多元共渗技术在550℃条件下对调质态45CrMoV模具钢样品分别进行了1 h、2 h、4 h和8 h的共渗处理,利用金相显微镜、显微硬度计、滑动摩擦磨损试验机、电化学工作站等对渗层的微观形貌、显微硬度、耐磨性、耐蚀性进行了测试和分析。结果表明,经过低温气体多元共渗处理的样品具有良好的耐蚀性,且随多元共渗时间的增长,耐蚀性有所增强,共渗时间在4 h以内,由于腐蚀电位的提高,材料的耐蚀性增强,共渗处理8 h的样品则因为腐蚀电流大幅减小,抗腐蚀性能得到大幅提高;经过低温气体多元共渗处理的样品,耐磨性比原材有大幅提高,但随共渗时间增长,化合物层加厚,易于在摩擦过程中崩碎产生颗粒,使样品产生犁削磨损,因此耐磨性能下降。Using the gas multi-component thermochemical treatment technology , the 45CrMoV die steel sample were treated at 550 ℃for 1, 2, 4, 8 h respectively.The microstructure, micro-hardness, wear resistance, and the corrosion resistance of the treated case were analyzed by means of metallurgical microscopy , micro-hardness tester , friction and wear testing machine , electrochemical workstation .The results indicate that the samples treated with the low temperature gas multi-component thermochemical treatment technology can obtain good corrosion resistance.Generally, the corrosion resistance enhances with the increasing of the process time .When the time is less than 4 h, the corrosion resistance improved due to corrosion potential rising; when the time is 8 h, corrosion resistance can be significantly enhanced because the corrosion current obviously reduces .The abrasion resistance of the samples treated with the new technology can also be greatly improved than the untreated material .However , with the time further increases , the surface compound layer will become thicker , and liable to break into particles to plow the material surface , which makes cutting wear happens , so the surface wear resistance finally decreases .

关 键 词：45CrMoV模具钢 气体多元共渗 耐磨性 耐蚀性 

分 类 号：TG156.842[金属学及工艺—热处理]