27SiMn液压缸体开裂失效分析  

27SiMn Hydraulic Cylinder Body Cracking Failure Analysis

作　　者：张戟 赵勤 ZHANG Ji;ZHAO Qin(Hunan Hengyang Steel Tube Group Co.,Ltd.,Hengyang 421001,China)

机构地区：[1]湖南衡阳钢管集团有限公司,湖南衡阳421001

出　　处：《金属材料与冶金工程》2025年第2期27-30,共4页Metal Materials and Metallurgy Engineering

摘　　要：针对某公司生产的Φ457 mm×45 mm规格27SiMn液压支柱管,在热处理和加工后出现缸体爆裂的原因进行了分析。缸体开裂是由焊接起弧点或收弧点的失效引起,焊接过程中冷却速度过快导致形成淬火马氏体,增加了脆性;此外,调质后的基体组织不均匀,特别是块状铁素体的存在,降低了钢的综合力学性能,促进了裂纹的快速扩展。研究结果表明:不规范的焊接工艺操作是造成此次失效的直接原因,而基体的原始组织不均匀也是影响因素之一。The reasons for the bursting of the cylinder body after heat treatment and processing of theΦ457mm×45mm 27SiMn hydraulic prop pipe produced by a company were analyzed.The cracking of the cylinder body was attributed to failures at the welding arc starting or ending points.The excessively rapid cooling during the welding process led to the formation of quenched martensite,which increased brittleness.Furthermore,the uneven microstructure of the matrix after quenching and tempering,particularly the presence of blocky ferrite,reduced the overall mechanical properties of the steel and facilitated the rapid propagation of cracks.The results indicate that non-standard welding practices were the direct cause of the failure,and the uneven initial microstructure of the matrix was also one of the contributing factors.

关 键 词：27SIMN钢 失效 开裂 液压支架 

分 类 号：TG142.1[一般工业技术—材料科学与工程]