金属热处理 ›› 2023, Vol. 48 ›› Issue (9): 293-296.DOI: 10.13251/j.issn.0254-6051.2023.09.050

• 测试与分析 • 上一篇    

太阳轮渗碳淬火裂纹产生的原因分析

张磊, 米佩, 马春亮, 孙永鹏   

  1. 宁夏天地奔牛实业集团有限公司, 宁夏 石嘴山 753001
  • 收稿日期:2023-04-11 修回日期:2023-07-19 出版日期:2023-09-25 发布日期:2023-10-25
  • 作者简介:张 磊(1985—),男,工程师,主要研究方向为材料成形及热处理,E-mail:540670211@qq.com
  • 基金资助:
    单机功率3000 kW超重型智能刮板输送机用行星齿轮减速器研制(2022BDE92023)

Cause analysis of carburizing quenching cracks of sun gear

Zhang Lei, Mi Pei, Ma Chunliang, Sun Yongpeng   

  1. Ningxia Tiandi Benniu Industrial Group Co., Ltd., Shizuishan Ningxia 753001, China
  • Received:2023-04-11 Revised:2023-07-19 Online:2023-09-25 Published:2023-10-25

摘要: 某矿用减速器太阳轮渗碳淬火后发生齿部裂纹,因裂纹较深造成产品报废,为分析太阳轮失效原因,从原材料、热处理工艺、显微组织、晶粒尺寸以及裂纹宏观、微观形态特征等方面进行了分析探讨。结果表明,太阳轮所用材料化学成分符合18CrNiMo7-6钢标准,其裂纹是典型的沿晶开裂的淬火裂纹,其产生的主要原因与晶粒粗大有关。采用现有热处理工艺参数不会造成晶粒粗大,晶粒粗大与前期锻造加热或锻造过程不当有关。

关键词: 太阳轮, 18CrNiMo7-6钢, 渗碳淬火, 裂纹, 原因分析

Abstract: After carburizing and quenching, tooth cracks occurred in the sun gears of mining reducer, causing the products to be scrapped due to the deep cracks. In order to analyze the failure cause of the sun gear, the raw materials, heat treatment process, microstructure, grain size, and macro and micro morphological characteristics of the cracks were analyzed and discussed. The results show that the chemical composition of the material used for the sun gear conforms to the standard of the 18CrNiMo7-6 steel, and the cracks in the sun gear are typical intergranular quenching ones, the main reason of which is related to the coarse grain size. The coarse grains are not caused by the existing late heat treatment, but are mainly related to the improper heating temperature or forging process in the early process stages.

Key words: sun gear, 18CrNiMo7-6 steel, carburizing and quenching, cracks, cause analysis

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