摘要
粉末锻造(粉锻)技术结合了粉末冶金技术和精密锻造技术的优点,对烧结的预压件进行一次锻打即可生产出精度高、力学性能强的近净成形产品。本文选择一款齿轮材料(Q61),通过压制、脱脂、烧结工艺获得标准块预压件,然后进行闭模热锻获得致密的标准块。对标准块进行物理性能(密度、硬度、拉伸性能、疲劳性能等)测试和微观组织表征。结果表明,获得的Q61粉锻标准块基本完全致密,密度为7.87 g·cm^-3;空冷硬度约为HRC 25.3,淬火硬度约为HRC 62.1,空冷态较低的硬度为零件后续机加工、整形提供了保证,后续淬火获得的高硬度可节省渗碳工序;标准块抗拉强度达到1052.8 MPa,可与常用齿轮钢性能媲美。本文采用粉锻技术,成功制备出高质量行星直齿轮,其齿部高频淬火后硬度与渗碳齿轮的硬度相当。该工作为粉末锻造技术在我国工业界的发展提供了有益的探索。
Combining the advantages of powder metallurgy and precise forging technology, the powder forging(PF) technique can produce the nearly net-shaped products with the high precision and the outstanding mechanical properties efficiently. In this study, the preformed compact was processed by compacting, degreasing, and sintering, using a kind of gear material(Q61) as raw material, and finally the dense standard blocks was obtained by closed mold hot forging. The microstructure and physical properties of Q61 powder-forged blocks were characterized, including density, hardness, tensile properties, and fatigue properties. The results indicate that, the full densification blocks are prepared with the density of 7.87 g·cm^-3. The Rockwell hardness of the air-cooled block is HRC 25.3, which is capable for machining and shaping;while the quenched block shows the high hardness with HRC 62.1, which can omit the conventional carburizing process. The tensile strength of the standard blocks is 1052.8 MPa, which can match those of common gear steels. Then, the planetary spur gears are processed by powder forging, and the gear teeth by high-frequency quenching shows the equivalent hardness as that of carburizing gear. This is an exploratory study for the development of powder forged technique in China.
作者
张冰清
王琪
王邃
王华磊
江峰
孙军
ZHANG Bing-qing;WANG Qi;WANG Sui;WANG Hua-lei;JIANG Feng;SUN Jun(State Key Laboratory for Mechanical Behavior of Materials,Xi'an Jiaotong University,Xi'an 710049,China;Qingdao Shinhan Diamond Industry Co.,Ltd.,Qingdao 266555,China)
出处
《粉末冶金技术》
CAS
CSCD
北大核心
2020年第2期113-120,共8页
Powder Metallurgy Technology
基金
国家自然科学基金资助项目(51871178)
国家自然科学基金创新研究群体资助项目(51621063)。
关键词
粉末锻造
齿轮
微观组织
物理性能
powder forging
gear
microstructure
physical properties
