合成氨企业管道弯头环向断裂原因OA
Causes of circumferential fracture of pipeline elbow in synthetic ammonia enterprise
某合成氨企业高压管路中的一段弯头发生瞬时环向断裂现象,采用宏观观察、化学成分分析、扫描电镜和能谱分析、力学性能测试、低倍检验、金相检验等方法对弯头断裂原因进行分析.结果表明:弯头氮元素含量偏高,且冷弯后未进行正确的热处理,使其产生应变时效脆化和加工硬化现象;同时材料中环形疏松、带状组织及魏氏组织的存在进一步降低了弯头的力学性能,在一定冲击力的作用下,弯头发生脆性断裂现象.
Instantaneous circumferential fracture occurred in a section of elbow in a high-pressure pipeline of a synthetic ammonia enterprise.The causes of elbow fracture were analyzed by means of macroscopic observation,chemical composition analysis,scanning electron microscope and energy spectrum analysis,mechanical property test,low-magnification test and metallographic examination.The results show that the nitrogen content of the elbow was high,and the correct heat treatment was not carried out after cold bending,which caused strain aging embrittlement and work hardening.At the same time,the existence of ring loose,banded structure and widmanstatten structure in the material further reduced the mechanical properties of the elbow.Under the action of a certain impact force,the elbow underwent brittle fracture.
张新占;孙明华;张道福;臧伟;乔广通;亓海滨
山东省机械设计研究院,济南 250031||齐鲁工业大学(山东省科学院)机械工程学院,济南 250306瑞星集团股份有限公司,泰安 271509
弯头应变时效脆化和加工硬化脆性断裂疏松显微组织
elbowstrain agingembrittlement and work hardeningbrittle fractureloosemicrostructure
《理化检验-物理分册》 2024 (008)
36-40 / 5
中央引导地方科技发展专项资金项目(YDZX2022016);山东省科技型中小企业创新能力提升工程项目(2023TSGC0806)
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