液压支架立柱中缸裂纹原因分析及改进  

Cause analysis and solution of crack of hydraulic support column cylinder

作　　者：崔蕾蕾 马珂 兰志宇 王飘扬 邓想涛[2] Cui Leilei;Ma Ke;Lan Zhiyu;Wang Piaoyang;Deng Xiangtao(Zhengzhou Coal Mining Machinery Co.,Ltd.,Zhengzhou Henan 450016,China;State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang Liaoning 110819,China)

机构地区：[1]郑州煤矿机械集团股份有限公司,河南郑州450016 [2]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819

出　　处：《金属热处理》2024年第8期289-294,共6页Heat Treatment of Metals

基　　金：广西重点研发计划(桂科AB23026117)。

摘　　要：利用力学性能检测、微观组织分析及裂纹微观形貌表征等手段对某大型液压支架在服役过程中立柱中缸出现裂纹的原因进行了分析。结果表明,该液压支架立柱中缸开裂的原因与基体材料的组织性能无直接联系,而是由激光熔覆产生的熔覆缺陷导致,该缺陷促使不锈钢熔覆层与基体的结合界面处产生微裂纹,微裂纹在长期载荷作用下向基体侧及熔覆层扩展,最终导致开裂失效。通过改进激光熔覆参数,有效避免了激光熔覆缺陷的产生。Cracks in cylinder of a large hydraulic support column during service were analyzed by means of mechanical property detection,microstructure analysis and crack morphology characterization.The results show that the cracking of the cylinder of hydraulic support column is not directly related to the microstructure and properties of the matrix material,but is caused by the cladding defects.The cracks occur at the interface of the stainless steel clad layer and the matrix,and then expand to the matrix side and the clad layer side under the action of long⁃term load,finally,resulting in cracking failure.By improving laser cladding parameters,laser cladding defects can be effectively avoided.

关 键 词：液压支架 立柱中缸 失效分析 激光熔覆 

分 类 号：TG142.1[一般工业技术—材料科学与工程]