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采用TIG+MAG焊接工艺焊接1Cr18Ni9Ti不锈钢大管道。TIG焊内、外填丝法焊底层,MAG焊填充及盖面层。该工艺解决了以往采用TIG焊或手工电弧焊效率低、成本高、质量难以保证的问题。 相似文献
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异种金属1Cr18Ni9Ti和GH3044在点焊后X光检查时发现裂纹。通过对焊点进行金相检查、断口观察和电镜能谱分析后表面发现:焊缝组织为单相奥氏体组织,裂纹断口为典型焊接热裂纹形貌,焊点中镍含量较高。经过分析验证得出结论:由于焊接过程中GH3044熔入量大,导致焊缝中镍含量增大,形成单相奥氏体组织,产生焊接热裂纹。 相似文献
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针对热电厂50MW机组中主蒸汽管道管座(12Cr1MoV)与热电偶保护套管(1Cr18Ni9Ti)异种钢接头焊接问题,提出了以钨极氩弧焊H1Cr25Ni13焊丝封底,焊条电弧焊A307焊条填充盖面并适当控制焊缝熔合化的焊接工艺。实践证明,采用这种焊接工艺进行焊接,可以获得优良的焊缝,保证主蒸汽管道的安全运行。 相似文献
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本文对1Cr18Ni9Ti热轧棒材进行了稳定化处理工艺模拟性和工业性生产试验。结果表明,稳定化处理后的1Cr8Ni9Ti热轧棒材机械性能均能满足GB1220—84标准规定固溶处理后的力学性能指标,抗晶间腐蚀合格且晶粒均匀细小。因此认为,1Cr18Ni9Ti热轧棒材,可以采用稳定化处理代替固溶处理。 相似文献
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1Cr18Ni9Ti微塑性变形行为的研究 总被引:3,自引:0,他引:3
本文研究了1Cr18Ni9Ti在固溶态及预形变状态的微塑性变形规律和机理。在微塑性变形的不同阶段中,Ⅰ阶段对应晶界附近区域位错的运动与耗竭;Ⅱ阶段对应于晶粒内部位错全面开动与增殖并有晶界发射位错,相当于宏观变形的初始阶段。预变形对1Cr18Ni8Ti的宏观屈服强度σ_0.2与微屈服强度σ_(mys)(1~(-6))具有不同的影响规律。 相似文献
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应用扫描电镜、化学分析法,对泄漏的盘管进行分析,结果表明该不锈钢盘管泄漏是由于点蚀造成。探讨了防护对策。 相似文献
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ZHU Ping ZHANG Lining Southeast University Nanjing China ZHANG Lining Professor Department of Materials Science Engineering.Southeast University Nanjing China 《金属学报(英文版)》1990,3(9):191-195
The regularity and mechanism of the microplastic deformation of steel 1Cr18Ni9Ti both solu-tion-treated and prestrained were investigated.In the different stages of microplasticdeformation,stage 1 corresponds to the dislocation moving and exhausting in the regions neargrain boundaries.Stage 2,being the early stage of macroplastic deformation,corresponds tothe extensive operation and generation of dislocations in the interior of grains and also dislo-cation emission from the grain boundaries.The regularities of the effect of prestrain onmacro-and micro-yield strength are different. 相似文献
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土壤中SRB及Cl-对1Cr18Ni9Ti不锈钢腐蚀的相互影响 总被引:1,自引:2,他引:1
利用交流阻抗测试技术、扫描电镜及表面能谱、失重法、微生物分析等方法 ,研究了在不同Cl-含量的土壤中 ,硫酸盐还原菌对 1Cr18Ni9Ti不锈钢腐蚀的影响规律 .13 6d的试验结果表明 ,不同Cl-含量土壤中SRB菌量在2 3 0 0 0~ 3 5 0 0 0 (个 /克土 )之间 ,Cl-的加入并没有显著影响SRB的生长 ,随着Cl-的加入土壤中SRB的菌量有增大的趋势 ;随着土壤中Cl-含量的增大 ,不锈钢腐蚀电位负偏移 ,而且在接菌土壤中的腐蚀电位比在灭菌土壤中负移幅度更大 ;不锈钢在灭菌土壤中没有发生点蚀现象 ,而在接菌土壤中发生了严重的点蚀 ,最大点蚀深度随着土壤中Cl-含量的增加而增大 ,这说明在土壤中SRB及Cl-的共同作用下 ,增大了不锈钢的点蚀敏感性 .不锈钢在灭菌土壤中的阻抗图谱表现为一个半径很大的容抗弧 ,而在接菌土壤中的阻抗图表现为两个时间常数的双容抗弧 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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LIU Dacheng WANG Fuhui CAO Chunan LOU Hanyi Institute of Corrosion Protection of Metals Academia Sinica Shenyang China Wang Fuhui Laboratory of Electrochemistry Institute of Corrosion Protection of Metals Academia Sinica Shenyang China 《金属学报(英文版)》1990,3(8):77-80
A series of single bcc,bcc plus fcc duplex and single fcc microcrystalline coatings of1Cr18Ni9Ti stainless steel were prepared by using sputtering technique.The resistanceagainst pitting corrosion was studied by measurements of pitting corrosion potentials andelectrochemical noise during initiation of corrosion pits.The results show that the sputteredcoatings with single bcc phase or single fcc structure are more resistant to pitting corrosionthan those with bcc plus fcc duplex phase structure. 相似文献