共查询到18条相似文献,搜索用时 87 毫秒
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采用Ag-Cu-Ti钎料,控制钎焊温度为910℃,保温时间为20 min,可以实现Mo-Cu合金与1Cr1 8Ni9Ti不锈钢的真空钎焊,接头抗剪强度为75 MPa.采用扫描电镜、能谱分析仪和显微硬度计对Mo-Cu/1 Cr18 Ni9Ti接头组织特征及性能进行分析.结果表明,钎焊接头靠近1Cr18Ni9Ti钢一侧,主要形成Ag-Cu共晶组织和少量的TiC相;靠近Mo-Cu合金一侧,Ag,Cu元素在合金与钎缝间相向扩散,共晶组织消失,以富铜相为主.钎缝的显微硬度明显低于Mo-Cu合金和1Cr18Ni9Ti不锈钢母材,无脆性化合物生成,剪切断口呈现剪切韧窝的形貌特征. 相似文献
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采用真空扩散连接法制备了CuCr/1Cr18Ni9Ti双金属复合材料,研究了熔铸温度对结合区组织形貌、界面反应层宽度和界面区域显微硬度的影响。结果表明,在1090℃下连接的CuCr/1Cr18Ni9Ti复合材料界面析出相颗粒的尺寸和分布最均匀,反应层也最宽,界面反应层的显微硬度呈现凸起趋势。 相似文献
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某型发动机固定S型防冰空气管的卡箍采用1Cr18Ni9Ti奥氏体不锈钢制造,该件卡箍服役后发生断裂.通过外观观察、断口宏微观观察、金相组织检查、显微硬度试验和化学成分分析对卡箍断裂原因进行分析.结果表明:卡箍的断裂为高周疲劳断裂,卡箍断裂源区存在应力集中现象.通过改进卡箍R角大小以及使用限力扳手降低装配弯曲应力,预防了... 相似文献
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研究采用Ni-Ag复合镀层,在特定的工艺参数条件下,对6063铝合金与1Cr18Ni9Ti进行了共晶反应钎焊试验,初步分析探讨了工艺参数对钎缝微观组织结构反形态的影响和Ni层的阻隔作用.对钎缝的界面作扫描电镜和能谱分析发现,镀层与母材等各界面连接紧密,特别是钎缝与母材之间没有生成脆性Al-Fe金属间化合物.结果表明:在钎焊温度580℃,共晶反应钎焊6063铝合金1Cr18Ni9Ti,保温5 min,钎缝成形较好;面心立方结构Ni/Ag电刷镀层能有效地阻挡Al,Fe等原子扩散. 相似文献
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The developed 1Cr18Ni9Ti austenitic stainless steel containing 1.63 wt.%B have been characterized by X-ray diffraction (XRD), electron probe microanalyzer (EPMA), optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and Vickers microhardness measurement. The microstructural evolution and property of high boron stainless steel after solution treatment at the temperature of 1050℃ are also investigated. The results show that the main compositions of borides are Fe, Cr and B, and with small amount of Ni, Mn and C elements. Silicon is insoluble in the borides. The hardness of borides is over 1,500 HV. It has been found that borides do not decompose during solution treatment, but part of borides dissolves into the matrix. The effect of increasing the solubility of boron element in the austenitic matrix favours the hardness enhancement by 8.54%. High boron stainless steel has excellent wear resistance in corrosive environment. Lifetime of transfer pipe made of high boron-containing stainless steel is 1.5-1.8 times longer than that of boron-free 1Cr18Ni9Ti stainless steel. 相似文献
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通过钨极氩弧焊方法,对 1Cr18Ni9Ti 与 1Cr13 实施焊接.采用光学显微镜、扫描电镜对 1Cr13 马氏体型与 1Cr18Ni9Ti 奥氏体型不锈钢焊接接头进行金相组织、断口形貌观察及分析;利用显微硬度计、电子万能拉伸机测量焊接接头的力学性能;并通过海水模拟溶液浸泡试验,测量焊接接头极化曲线和交流阻抗谱.结果表明,通过手工钨极氩弧焊,采用直流正接接法,在合适的工艺下(焊接电流为 80 A,焊接速度为 110 mm/min),能够获得外观平整、组织均匀,力学性能与电化学性能符合要求的焊接接头.Abstract: The stainless steels of 1Cr18Ni9Ti and 1Cr13 were welded through deterministic craft by tungsten inert-gas (TIG) welding. The microstructure and fracture pattern of weld joints of 1Cr13martensite and 1Cr18Ni9Ti austenite stainless steels were observed and analyzed by means of LOM and SEM, the mechanical properties of the weld joints were measured with micro-hardness tester and electronic universal stretcher, and the polarization curves and AC impedance spectroscopy of weld joints were tested by seawater immersion test of simulation solution. The results show that adopting manual TIG welding through electrode negative to direct current soldering machine to weld 1Cr18Ni9Ti austenite stainless steel and 1Cr13 martensite stainless steel is feasible; under suitable process (welding current is 80 A, welding speed is 110 mm/min), weld joints can obtain good appearance and uniform structure; mechanical properties and galvano-chemistry properties can meet use requirements. 相似文献
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采用不同Ti含量的SnAgCu-x%Ti复合钎料对K9玻璃与2507不锈钢进行了真空钎焊,研究了Ti含量对接头界面组织和力学性能的影响。采用场发射扫描电子显微镜(SEM)、能谱仪(EDS)和光学数码显微镜(OM)对钎焊接头组织结构进行了分析,用万能材料试验机对接头进行了剪切试验测试得到其力学性能,并对断口界面进行了分析。结果表明,接头界面典型组织结构为2507不锈钢/FeSn2/FeSn/Sn(s,s)/Ti-Sn/K9玻璃。随着复合钎料中Ti含量的增加,接头界面中Ti-Sn化合物增多,且剪切强度升高。在钎焊温度为675 ℃,保温时间为10 min时,接头室温剪切强度最高达7.3 MPa。钎焊接头断裂于K9玻璃并延伸至钎料中。 相似文献
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ZG1Cr18Ni9奥氏体不锈钢的渗硼 总被引:2,自引:0,他引:2
对ZG1Cr18Ni9奥氏体不锈钢进行了渗硼处理,渗硼剂采用含双活化剂(氟硼酸钾和氯化铵)的粉末渗硼剂:碳化硼+碳粉+碳化硅+氟硼酸钾+氯化铵,渗硼温度为950 ℃,渗硼时间为7 h.在金相显微镜下观察渗层组织致密,齿型平坦,并测得渗层的厚度为38~42 μm;经X射线衍射分析以及扫描电镜观察表明,渗层主要由FeB相组成,在过渡区有明显的增铬现象,说明硼化物层有一定的排铬作用.利用显微硬度计测得渗后形成的硼化物层的硬度可达2000 HV0.1.沿硼化物-过渡区-基体方向,硬度值呈逐渐下降趋势.渗层的脆性较小,脆性级别为2级.ZG1Cr18Ni9奥氏体不锈钢通过含双催渗剂的渗硼剂渗硼,组织均匀且与基体结合紧密,硬度明显提高. 相似文献
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采用钨极氩弧焊(GTAW)和奥氏体不锈钢焊丝LNT309LSi作为填充金属,研究了Fe-Cr-2Al-Si阻尼合金和1Cr18Ni9Ti不锈钢的焊接工艺和焊接质量。借助金相显微镜分析了焊缝组织特征,采用电子探析分析了焊缝成分。按照国家标准研究了焊接接头的硬度、拉伸性能和弯曲性能。结果表明,用奥低不锈钢焊丝焊接Fe-Cr-2Al-Si阻尼合金和1Cr18Ni9Ti不锈钢,可获得理想的奥氏体+少量的铁素体+马氏体的焊缝组织,焊缝的抗拉强度和抗弯性能均高于阻尼合金。所采用的焊接方法、焊接工艺和焊丝能满足这两种钢的焊接要求,焊接质量可靠。 相似文献
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焊接接头焊趾处的等离子喷涂层可改善焊缝截面形状变化,降低该处的应力集中,提高焊接结构的疲劳强度。采用1Crl8Ni9Ti不锈钢十字接头焊态和喷涂处理试样分别进行疲劳对比试验,并对试验结果进行统计分析。疲劳试验结果表明,等离子喷涂后1Crl8Ni9Ti接头疲劳性能明显改善。焊态试件的疲劳强度为169.8MPa,火焰喷涂试件为186.2MPa,等离子喷涂试件为213.8MPa,与焊态试件相比,等离子喷涂试件的疲劳强度提高25.9%,火焰喷涂试件提高9.7%。等离子喷涂试件的疲劳寿命是焊态试件的1.58~9.62倍,火焰喷涂试件的疲劳寿命是焊态的1.55~1.97倍。 相似文献
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The HIP diffusion bonding of P/M titanium alloy Ti-6A1-4V and stainless steel 1Cr18Ni9Ti using pure Ni as intermediate layer was studied. Bonding joint with complex bonding interface was obtained by HIPing pre-alloyed Ti-6Al-4V powders and stainless steel 1Crl 8Ni9Ti in a vacuum canning. The joint strengths were examined and the characteristics of bonding joint were observed. The result shows that the maximized strength of HIP diffusion bonding between P/M titanium alloy Ti-6Al-4V and stainless steel 1Cr18Ni9Ti can be up to 388 MPa and the microstructure of bonding joint is acceptable. 相似文献