摘要
某液压油缸使用了05Cr17Ni4Cu4nNb沉淀硬化不锈钢制造,在使用中发生脆性开裂,裂纹长达2. 0 m。通过断口观察、腐蚀产物成分分析、力学性能测试、微观组织分析等试验,揭示了该油缸的开裂原因及机理。液压油缸开裂的原因是由于在缸体外壁产生缝隙腐蚀,造成局部点腐蚀坑;在油缸热处理后残余应力和外界腐蚀条件的共同作用下,产生了应力腐蚀及沿晶开裂,形成局部裂纹;在外力作用下局部裂纹急速扩展为贯穿性长裂纹。
A hydraulic cylinder made of 05Cr17Ni4Cu4nNb stainless steel cracked in brittle mode in use,with a crack length up to 2. 0 meters.Through fracture observation,corrosion product composition analysis,mechanical properties test and microstructure analysis,the cause and mechanism of cracking in the cylinder were revealed. It is due to crevice corrosion in the cylinder out-wall and causing local corrosion. Under interaction of residual stress resulted from heat treatment and external corrosion conditions,stress corrosion and intergranular cracking are produced,and local cracks are formed,and then the local cracks are rapidly propagated into a long penetrating crack under external force.
作者
孙永庆
刘振宝
李文辉
王长军
杨志勇
梁剑雄
Sun Yongqing;Liu Zhenbao;Li Wenhui;Wang Changjun;Yang Zhiyong;Liang Jianxiong(Special Steel Institute,Central Iron and Steel Research Institute,Beijing 100081,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2018年第11期239-242,共4页
Heat Treatment of Metals
关键词
液压油缸
应力腐蚀
缝隙腐蚀
沿晶开裂
hydrocylinder
stress corrosion
crevice corrosion
intergranular cracking
作者简介
孙永庆（1978-），男，高级工程师，博士，主要研究方向：高强度超高强度不锈钢，联系电话：010-62182912，E-mail：sunyongqing@nercast．com
