金属热处理 ›› 2020, Vol. 45 ›› Issue (1): 259-262.DOI: 10.13251/j.issn.0254-6051.2020.01.050

• 测试与分析 • 上一篇    

柱塞卡滞原因分析

牛娜, 杨朝阳, 焦金亮   

  1. 中国航发西安动力控制科技有限公司, 陕西 西安 710077
  • 收稿日期:2019-07-06 出版日期:2020-01-25 发布日期:2020-04-03
  • 作者简介:牛 娜(1986—),女,工程师,硕士,主要从事航空发动机相关产品的失效分析,物理冶金分析等方向,联系电话:029-84675614,E-mail:niunanina@163.com。

Causes analysis of plunger sticking

Niu Na, Yang Zhaoyang, Jiao Jinliang   

  1. AECC Xi’an Engine Control Co., Ltd., Xi'an Shaanxi 710077, China
  • Received:2019-07-06 Online:2020-01-25 Published:2020-04-03

摘要: 某柱塞泵工作中发生柱塞卡滞,经显微形貌观察、光谱分析、电子探针面扫描分析和显微硬度分析等,确定柱塞卡滞的根本原因为原材料组织中存在严重的网状共晶碳化物,降低了强度和韧性,增大了柱塞球面表层的脆性,进而导致了球面部位的接触疲劳抗力下降。严重的疲劳磨损与接触疲劳造成了柱塞球面脱层破坏,由此产生的金属碎屑进入柱塞与衬套的配合间隙处,进而限制了柱塞的自由运动。

关键词: Cr12MoV, 柱塞卡滞, 网状共晶碳化物, 疲劳磨损, 接触疲劳

Abstract: Plunger stick seizing up happened during plunger pump working. Causes of the seizure was examined by means of microstructure analysis, EDS, SEM, electron probe scanning analysis and hardness test. The analysis results show that the root cause of the plunger seizure is the severe reticulation eutectic carbide existing in the raw material of Cr12MoV. The internal strength and toughness of the plunger are reduced by these network of eutectic carbides. The contact fatigue resistance is lowered by the larger brittleness of the plunger spherical surface. Plunger seizure is caused by the metal scraping pulled off from the plunger spherical surface which is between the plunger and the sleeve.

Key words: Cr12MoV, plunger stick, reticulation eutectic carbide, fatigue wear, contact fatigue

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