非金属夹杂物对纯镍N6焊接接头组织性能的影响

发布时间：2018-03-30 09:11

本文选题：纯镍N　切入点：焊接接头　出处：《材料导报》2015年18期

【摘要】：以纯镍N6为主要研究对象,借助光学显微镜(OM)、扫描电镜(SEM)、能谱分析仪(EDS)、X射线衍射仪(XRD)及电解萃取装置等手段分析了非金属夹杂物对纯镍N6焊接接头结构及性能的影响。结果表明:纯镍N6试样断裂与非金属夹杂物尺寸、形貌、数量等因素有直接的关系;非正常断裂试样的断口表现为沿晶断裂,断口上夹杂物主要由Al、Si、Ca、Mg、O、Fe等元素组成;对试样的金相组织与夹杂物进行分析发现非正常断裂试样中夹杂物数量及尺寸均大于正常试样,杂物数量大于50个/mm2且夹杂物尺寸大于10μm的试样均发生断裂;夹杂物主要为氧化铝类(Al2O3、SiO2)、硅酸盐类、氮化物类(AlN、TiN、Ti(C,N))及复相夹杂物;原位拉伸试验表明,断裂的主要原因是在金属基体中存在的夹杂物诱发裂纹源,在应力的作用下裂纹扩展导致断裂。综合分析表明,纯镍N6焊接接头在生产中的断裂是由脆性夹杂物的存在而引起的。
[Abstract]:Taking pure nickel N6 as the main research object, The effects of nonmetallic inclusions on the structure and properties of pure nickel N6 welded joints were analyzed by means of optical microscope, scanning electron microscope (SEM), energy dispersive spectrometer (EDS), X-ray diffraction (XRD) and electrolytic extraction apparatus. The results showed that pure nickel N6 was tested. Sample fracture and nonmetallic inclusions size, The fracture surface of the abnormal fracture specimen is intergranular fracture, and the inclusions on the fracture surface are mainly composed of the elements such as Al _ 2O _ Si _ (Ca) C _ ((10)) MgO _ ((O)) _ (Fe), etc. The metallographic structure and inclusions of the samples were analyzed. It was found that the amount and size of inclusions in abnormal fracture specimens were larger than that of normal specimens, and the samples with inclusions larger than 50 / mm ~ 2 and the size of inclusions larger than 10 渭 m were fractured. The inclusions are mainly Al _ 2O _ 3-Si _ 2O _ 2, silicate, nitride, and multiphase inclusions, and the in-situ tensile test shows that the main reason of fracture is the crack source caused by inclusions in the metal matrix. The comprehensive analysis shows that the fracture of pure nickel N6 welded joint is caused by the existence of brittle inclusions.
【作者单位】：兰州理工大学有色金属先进加工与再利用省部共建国家重点实验室;金川集团股份有限公司;
【基金】：甘肃省科技支撑计划资助项目(1104GKCA051)
【分类号】：TG407;TG457.19

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