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阀座激光熔覆层开裂原因分析
Cracking Cause Analysis of Valve Seat Laser Clad Layer
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- DOI:
- 作者:
- 杨成新 1 ，张绪亮 1 ，杜志杰 2 ，张春婉 2 ，王鹏程 1
YANG Chengxin1 , ZHANG Xuliang1 , DU Zhijie2 , ZHANG Chunwan2 , WANG Pengcheng1
- 作者单位:
- 1. 中国石油塔里木油田分公司，新疆 库尔勒 841000；2. 西安摩尔石油工程实验室股份有限公司，陕西 西安 710065
1. PetroChina Tarim Oilfield Company, Korla 841000, China; 2. Xi'an Maurer Petroleum Engineering Laboratory Co., Ltd., Xi'an 710065, China
- 关键词:
- 阀座；熔覆层；柱状晶
valve seat; cladding layer; columnar crystal
- 摘要:
- 某井在检修时发现阀座表面存在裂纹，通过化学成分测试、力学性能试验、宏观 / 微观观察等手段，对该阀
座开裂的原因进行分析。 结果表明，阀座表面熔覆层组织为柱状晶，裂纹沿柱状晶扩展，为解理特征；而其他未开裂的熔
覆层的组织均为等轴晶。 阀座表面熔覆层开裂主要由于熔覆工艺不合理，产生大量柱状晶，导致熔覆层硬而脆，韧性差，
在振动工况下，熔覆层开裂。
A crack was found on the surface of the valve seat in the maintenance of an oil well. The cause of the cracking of the valve seat was analyzed with chemical composition test, mechanical performance test, macro/micro observation and other means. The results show that the structure of the cladding layer on the surface of the valve seat is columnar grain, and the crack propagation along the columnar grain is cleavage characteristic. The microstructure of other uncracked cladding layers is equiaxed crystal. Cracking of cladding layer on valve seat surface is mainly due to unreasonable cladding process, which produces a large number of columnar crystals, resulting in hard and brittle cladding layer, poor toughness, and cracking of cladding layer under vibration condition.