Failure Mechanism of Ultra-High Pressure Fluid Control Products

Xin Long Chen

doi:10.4028/www.scientific.net/AMM.703.381

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 703Failure Mechanism of Ultra-High Pressure Fluid...

Failure Mechanism of Ultra-High Pressure Fluid Control Products

Abstract:

The square elbows used in oil and gas fields were often failed because of serious erosion. Some of the products even burst. In this paper, the failure mechanism of square elbow was investigated by using electron microscopy (OM), electron microscopy (SEM) methods. The research results show that the elbow products failed due to its low impact toughness after carburizing and quenching. The erosion angle is nearly ninety-degree. By increasing the tempering temperature, reducing the surface hardness and improving toughness, the serious erosion phenomenon can be effectively avoided. There are two main reasons of the elbow products burst. One reason is the high inclusion content of the material. The other is the low impact toughness. Raising the quality specification of materials can appropriate increase the low impact toughness after heat treatment. It is pointed out that the product would be more safety by improve its impact toughness.

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Periodical:

Applied Mechanics and Materials (Volume 703)

Pages:

381-384

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.703.381

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Online since:

December 2014

Authors:

Xin Long Chen*

Keywords:

Failure Mechanism, Impact Toughness, Square Elbow

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