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Through the addition of rare earth oxides into the coming of electrodes, the high temperature oxidation and sulphidation resistance of weld metal were studied. The transfer mechanism of rare earth oxides from coating to the welding pool and the physicochemical reaction during the process were analyzed. With the application of scanning electron microscope and energy spectrometer, the mechanism of weld metal corrosion in air and sulphur environment were studied. The result shows that the addition of rare earth oxides can improve the high temperature resistance of weld metal, especially in sulphidation environment. The electrodes in which La2O3 is added have better performance than the electrodes in which CeO2 is added. The existence form and distribution characteristic of rare earth are defined. It is believed that the marked effect of rare earth oxides in sulphur environment is related to the corrosion mechanism. 相似文献
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本文利用光学金相、扫描电镜等手段,研究了探讨了用Cr30Ni10型焊条焊接不同球光体钢接头“不均匀混合区”的组织特征及形成原因,并分析了其对接头抗裂性的影响。所得结论,为推广应用Cr30Ni10型焊条以及提高异种钢接头质量提供了试验和理论依据。 相似文献
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母材中碳进入熔池方式及其影响研究 总被引:1,自引:0,他引:1
归纳并提出了熔地母材中碳进入熔池中的方式,在此基础上,探讨了焊态下熔焊接头中脱/增碳层的形成原因,形成时期以及焊缝不均匀混合区中的碳分布特点。得出”母材中碳以机械混合唱 ,母材团,扩散混合三种方式进入熔池 态下,母材侧不完全熔化区因碳扩散鸸菜成了不明显的脱碳层,焊缝侧不均匀混合区因多为源方式而形成了碳分布不均匀的增碳层。利用异种接头金相观察和硬度测试结果。验证了所得结论的正确性。 相似文献
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08MnNiVR(B610E)高强度调质钢板的焊接性能 总被引:2,自引:0,他引:2
时32mm厚08MnNiVR(B610E)高强度调质钢进行了全面的焊接试验研究.测定了模拟焊接热影响区连续冷却转变(CCT)图,分析了不同冷却速度下的模拟焊接热影响区组织变化;钢板在不预热条件下,焊接热影响区最高硬度为HV327;钢板在焊前预热75℃时,斜Y坡口试验未发现焊接冷裂纹;在平板对接反面拘束裂纹试验和斜Y型坡口焊接裂纹试样sR(Residual-stress relief)处理模拟再热裂纹试验中,没有发现再热裂纹发生.试验结果表明:08MnNiVR(B610E)高强度调质钢具有良好的抗冷裂纹和抗再热裂纹的能力. 相似文献
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The fractal dimension of the fusion line in different dissimilar welded joints is measured with Box Dimension Method.The non-scale region of the fusi on line with fractal character is calculated. The fusion line in the dissimilar welded joint is proved to be a fractal structure. The change and influence factors of the fractal dimension of the fusion line are studied. 相似文献
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宝钢锅炉容器和电力用厚钢板的开发和应用进展 总被引:1,自引:0,他引:1
介绍了宝钢股份公司5 m厚板产线投产4年来生产的钢板的品种、规格拓展情况以及相关企业标准制定情况,重点介绍了大型原油储罐、低温球罐、电力(核电、水电和火电)用高强度钢板的开发、试制、生产和工程应用情况.总结了宝钢在锅炉、压力容器、电力用钢板的经验,提出厚板产品的展望. 相似文献
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本文运用氚自射线照相法和接头充氢后释放规律的观察,研究了Cr30Ni9/高碳钢接头不均匀混俣区中的富奥氏体带的形成及其对接头氢扩散和聚集行为的影响,并建立了相应的氢扩展模型。试验和分析结果表明:富粤氏体带的形成将延缓和阻焊缝中的氢向材侧扩散;母材侧仅在熔池阶段及结晶后的高温阶段扩散进行了少量的氢,所得结论,对研究异种钢接头熔合线两侧的冷裂纹的形成机及有其理论指导作用。 相似文献