Causes analysis of plunger sticking

doi:10.13251/j.issn.0254-6051.2020.01.050

Abstract

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

CLC Number:

TG142.33

Niu Na, Yang Zhaoyang, Jiao Jinliang. Causes analysis of plunger sticking[J]. HTM, 2020, 45(1): 259-262.

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