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11.
Study on the Formation of η Phase During TIG Welding 总被引:1,自引:0,他引:1
The paper studied the effect of Ni-Fe-C filler materials on the η phase formation during TIG welding of WC-30Co and 45 steel, η phase‘s morphology and forming condition were discussed using I3EI method. The properties of the weld joints were also measured using microhardness measurement and four-point bending measurement. The results show that the weld joints of WC-30Co/45 steel can be obtained by TIG welding using different Ni-Fe-C materials as filler materials, and η phase formed in the joints is M6C, M12C type carbides. The poor carbon content of the W-Co-C system resulted from the C diffusion and the high ingredient Fe are the two vital factors inducing to η phase formation. It can be restricted by the addition of C element into Ni-Fe material. When carbon content is 0. 01% in filler material, bend strength σbb of weld joint is 908 MPa. However, when carbon content increases to 0.41% in filler material, bend strength σbb is 1 260 MPa. 相似文献
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最终退火后的晶粒尺寸对锡青铜波纹管滞弹性的影响 总被引:1,自引:0,他引:1
滞弹性是衡量金属波纹管性能的一个重要指标,它不仅与材料的原子间结合力有关,而且还与材料的组织状态有关。国外对测量弹性元件的滞弹性和热处理后的机械性能及组织状态提出了相应的技术要求,国内一些生产厂家虽然对弹性元件的弹性模量、刚度和晶粒尺寸有一定要求,但没有统一的标准,本文的目的在于通过实验,找出锡青铜Q_(Sn65-01)和Q_(Sn4-03)波纹管管坯的最终退火晶粒尺寸对其滞弹性的影响。 相似文献
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以纳米级的(WO3+C)混合粉末制备新型堆焊焊条,该纳米粉末在药皮配方中最多可加24.5%.对该焊条进行了工艺性试验,并对堆焊层的组织、化学成分及硬度等进行了检验及分析,试验结果表明:该焊条焊接工艺性良好,熔敷效率高;堆焊层组织细小,主要为富W碳化物(Fe6W6C)、奥氏体加少量马氏体,560℃×4h回火后,组织为针状马氏体、少量残余奥氏体和碳化物Fe6W6C.焊后堆焊层硬度在HRC50以上,回火后堆焊层硬度大幅度提高,最高可达HRC64.5.和微分级粉末相比,纳米粉末制备的焊条,基体中的含W量高,组织细小,回火后硬度高,适于耐磨堆焊. 相似文献
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分析了三种不同焊接工艺焊接的汽车空调机活塞球杆焊接接头的显微组织,并对其显微硬度分布进行了测定,探讨了焊接工艺对显微组织的影响。 相似文献
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选择225Cr─1Mo钢手工电弧多层焊焊接头进行了不同工艺规范的持久强度试验,用透射电镜对蠕变断裂时母材和焊缝碳化物的形态、大小和分布进行了分析,采用选区电子衍射和EDAX能谱分析方法对析出的碳化物类型进行了鉴定.结果表明,试验中出现的碳化物类型分别为Fe3C,Mo2C和M23C6.在试验时间较长应力较小时,断裂试样中针状Mo2C在晶内聚集粗化,块状M23C6在晶界聚集粗化,这种碳化物分布状态是影响蠕变断裂的主要因素. 相似文献
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The paper studied the effect of Ni-Fe-C filler materials on the η phase formation during TIG welding of WC-30Co and 45 steel. ηphase's morphology and forming condition were discussed using BEI method. The properties of the weld joints were also measured using microhardness measurement and four-point bending measurement. The results show that the weld joints of WC-30Co/45 steel can be obtained by TIG welding using different Ni-Fe-C materials as filler materials, and ηphase formed in the joints is M6C, M12C type carbides. The poor carbon content of the W-Co-C system resulted from the C diffusion and the high ingredient Fe are the two vital factors inducing to ηphase formation. It can be restricted by the addition of C element into Ni-Fe material. When carbon content is 0.01 % in filler material, bend strength σbb of weld joint is 908 MPa. However, when carbon content increases to 0. 41% in filler material, bend strength σbb is 1 260 MPa. 相似文献
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在5%高氯酸酒精溶液中采用双喷电解抛光技术制备了2Cr-1Mo钢薄膜样品,试验了电解抛光温度、电压和电流密度对薄膜试样质量的影响,通过透射电镜分析,确定出当温度为-40℃,电压为60V,电流密度为4.2maA/mm2时,可制出理想的电镜薄膜试样. 相似文献
20.
用WO3+C纳米粉末制备新型堆焊焊条 总被引:3,自引:0,他引:3
以纳米级的(WO3+C)混合粉末制备新型堆焊焊条,该纳米粉末在药皮配方中最多可加24.5%对该焊条进行了工艺性试验,并对堆焊层的组织、化学成分及硬度等进行了检验及分析。试验结果表明:该焊条焊接工艺性良好,熔敷效率高;堆焊层组织细小,主要为富W碳化物(Fe6W6C)、奥氏体加少量马氏体,560℃×4h回火后,组织为针状马氏体、少量残余奥氏体和碳化物Fe6W6C.焊后堆焊层硬度在HRC50以上,回火后堆焊层硬度大幅度提高,最高可达HRC64.5.和微分级粉末相比,纳米粉末制备的焊条,基体中的含W量高,组织细小,回火后硬度高,适于耐磨堆焊. 相似文献