Φ530 mm×55 mm 45鋼液壓油缸試壓爆裂失效分析

Failure Analysis on Bursting of Φ530 mm×55 mm 45 Steel Hydraulic Cylinder during Hydrostatic Test

摘要: 為找出45鋼液壓油缸在水壓過程中發(fā)生爆裂的原因，分析該液壓油缸管的宏觀形貌、微觀金相組織、掃描電鏡照片、能譜及理化性能檢驗(yàn)結(jié)果。分析結(jié)果表明，缸體外表面焊接后未及時(shí)進(jìn)行去應(yīng)力退火處理或去應(yīng)力退火不到位而產(chǎn)生的焊接裂紋，是導(dǎo)致缸體在進(jìn)行水壓過程中發(fā)生脆性開裂的主要原因。建議嚴(yán)格控制焊接工藝，增加有效的焊后無損檢測(cè)措施，確保鋼管正火態(tài)交貨。

Abstract: To find out the causes for the bursting of the 45 steel hydraulic cylinder during hydrostatic test,analyses are conducted on the results of relevant tests as made to the cylinder,including macroscopic analysis,the metallurgical analysis,the SEM analysis,the EDS analysis,and the mechanical and chemical property testing etc.It is identified via the analyses that the main reason for the said busting is the welding cracks which are caused by absence of stress-relief annealing treatment,or insufficient stress-relief annealing treatment.Accordingly it is suggested to take such actions as strict control of the welding process,adding necessary after-welding NDT inspections and ensuring the as-normalized furnishing state of the steel tube.