山东科学 ›› 2020, Vol. 33 ›› Issue (2): 27-32.doi: 10.3976/j.issn.1002-4026.2020.02.005

• 新材料 • 上一篇    下一篇

铁基粉末冶金齿轮断裂失效分析及其工艺改进研究

陈燕飞1,2,宋晓村2*,赖华生1,文小强1,周吉学2   

  1. 1.赣州有色冶金研究所,江西 赣州 341412;2.齐鲁工业大学(山东省科学院) 山东省科学院新材料研究所,山东 济南 250014
  • 收稿日期:2019-10-24 出版日期:2020-04-20 发布日期:2020-03-30
  • 通信作者: 宋晓村,女,助理研究员。 E-mail:sunshinesxc@126.com
  • 作者简介:陈燕飞(1990—),男,工程师,研究方向为材料制备技术。
  • 基金资助:
    国家重点研发计划(2017YFB0103904);山东省重点研发计划(2017CXGC0404);山东省自然科学基金(ZR2018PEM001)

Fracture failure analysis and process improvement of iron-based powder metallurgy gears

CHEN Yan-fei1,2,SONG Xiao-cun2*,LAI Hua-sheng1,WEN Xiao-qiang1,ZHOU Ji-xue2   

  1. 1. Ganzhou Nonferrous Metallurgy Research Institute, Ganzhou 341400, China; 2. Advanced Materials Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China
  • Received:2019-10-24 Online:2020-04-20 Published:2020-03-30

摘要: 针对某型粉末冶金齿轮在运行期间出现的断齿现象,通过扫描电镜、能谱仪分析断口形貌、成分,发现断口位置存在大量球状铁碳化合物,表明原工艺由于烧结温度、时间不足,造成了粉末之间结合力弱的缺陷。在此基础上,以Fe1.8Ni-0.5Mo-1.2Cu-0.2C预合金粉为研究对象,改进烧结工艺,采用压制、烧结、淬火与低温回火的新工艺,制备出的齿轮珠光体数量级别为珠60,热处理后齿轮组织由回火马氏体和铁素体组成,冲击韧性由9.8 J/cm2提升至15.2 J/cm2。结果表明,改进工艺能够显著提升粉末间的扩散、熔焊和再结晶效果,提高组织致密性和冲击韧性并使组织具有一定塑性。

关键词: 铁基, 粉末冶金, 断裂失效, 齿轮, 断口

Abstract: The teeth of a powder metallurgy gear were fractured during operation. A large number of globular iron-carbon compounds were found at the fracture site using SEM and EDS analysis, which indicates a weak bonding between powders resulting from an insufficient sintering temperature and duration of the original process. An improved sintering process and a new process of pressing, sintering, quenching, and low-temperature tempering were applied to Fe-1.8Ni-0.5Mo-1.2Cu-0.2C prealloyed powder. The pearlite quantity in the prepared gear is 60, and the new prepared gear comprises tempered martensite and ferrite subsequent to heat treatment. The impact toughness improved from 9.8 J/cm2 to 15.2 J/cm2.

Key words: iron based, powder metallurgy, fracture failure, gear, fracture

中图分类号: 

  • TF124