Cr-Ni-Co奥氏体堆焊材料的空泡腐蚀行为  

Cavitation erosion behavior of Cr-Ni-Co austenite deposited metal

作　　者：雷玉成[1] 秦敏明[1] 徐桂芳[1] 李涛[1] 孙文江[2] 

机构地区：[1]江苏大学材料科学与工程学院,镇江212013 [2]江苏双良空调设备股份有限公司,江阴214400

出　　处：《焊接学报》2011年第6期21-24,114,共4页Transactions of The China Welding Institution

基　　金：国家重大基础研究资助项目(2008CB717802);江苏大学科技创新团队资助项目(JD000019)

摘　　要：采用一种新型的Cr-Ni-Co奥氏体堆焊材料用钨极氩弧焊(TIG)堆焊到304不锈钢表面,将堆焊层与304不锈钢基体做对比,在人工海水的条件下利用超声波振动设备对两种材料进行耐空泡腐蚀试验,用失重法评价两种材料的抗空蚀性能,对Cr-Ni-Co堆焊层不同时间的空蚀形貌用扫描电镜(SEM)进行跟踪观测.结果表明,与304不锈钢的失重相比,Cr-Ni-Co堆焊层的失重显得很小,表现出优良的抗空蚀性能;从SEM观测到的形貌图的变化中看出滑移和相变是Cr-Ni-Co堆焊层吸收空泡冲击能的主要方式,应力集中使得材料易产生裂纹,进而导致材料的断裂和剥落.A new type of Cr-Ni-Co austenite surfacing material was carried out by TIG hardfacing to the surface of 304 stainless steel.An ultrasonic vibratory apparatus under conditions in artificial seawater was used to test two materials′ cavitation resistance,evaluated by weight loss.The cavitation morphology of Cr-Ni-Co overlaying in different time was observed by scanning electron microscopy(SEM).The results show that,compared with 304 stainless steel,the weight loss of Cr-Ni-Co clad layer is much lower,showing better cavitation-resistance.The SEM morphology shows that slippage and phase transformation are the main way of absorbing the energy of cavitation on the clad layer,the stress concentration makes the material easily crack,which lead to the fracture and spalling.

关 键 词：Cr-Ni-Co奥氏体钢 空蚀 堆焊 失重率 滑移带 

分 类 号：TG174.2[金属学及工艺—金属表面处理]