共查询到7条相似文献,搜索用时 4 毫秒
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Cleiton C. Silva Victor H.C. de Albuquerque Cícero R.O. Moura Willys M. Aguiar Jesualdo P. Farias 《Journal of Materials Engineering and Performance》2009,18(3):324-331
The present work evaluates the two-layer technique on the heat affected zone (HAZ) of AISI 4140 steel welded with different
heat input levels between the first and second layer. The weld heat input levels selected by the Higuchi test were 5/5, 5/10,
and 15/5 kJ/cm. The evaluation of the refining and/or tempering of the coarsened grain HAZ of the first layer was carried
out using metallographic tests, microhardness measurements, and the Charpy-V impact test. The tempering of the first layer
was only reached when the weld heat input ratio was 5/5 kJ/cm. The results of the Charpy-V impact test showed that the two-layer
technique was efficient, from the point of view of toughness, since the toughness values reached were greater than the base
metal for all weld heat input ratios applied. The results obtained indicate that the best performance of the two-layer deposition
technique was for the weld heat input ratio 5/5 kJ/cm employing low heat input. 相似文献
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通过膏剂渗硼工艺对AISI 410钢进行表面强化,分析了渗硼层的组织形貌,并测试了其硬度、耐磨损性能以及耐腐蚀性能。结果表明,渗硼层主要由FeB、Fe2B相组成,渗硼层/母材的结合界面较平坦;渗硼层外渗区硬度达1400 HV0.5以上,内渗区硬度达1100 HV0.5以上;渗硼处理后试样表面摩擦因数和截面磨痕面积显著减小,耐磨损性能得到改善;在电化学腐蚀试验中,渗硼试样自腐蚀电位大于母材试样、自腐蚀电流密度小于母材试样,说明渗硼处理降低了AISI 410钢表面的腐蚀倾向,其表面耐蚀性得到提高。 相似文献
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G.H. Aydo?du 《Corrosion Science》2006,48(11):3565-3583
In this study, double loop electrochemical potentiokinetic reactivation (DLEPR) test was applied to determine the degree of sensitization in 316L type stainless steel, where obtained results were correlated with revealed microstructures after oxalic acid test and weight loss measurements of Streicher and Huey acid tests. Best agreement was provided with test parameters which are 1 M H2SO4 and 0.005 M KSCN at 0.833 mV/s scan rate at 30 °C. Specimens were classified structurally as absence of chromium carbides - step, no single grain completely surrounded by carbides - dual and one or more grain completely surrounded by carbides - ditch, in the as-etched structure, if the Ir:Ia (×100) ratios were obtained to be between 0 and 0.2, 0.2 and 5.0 and 5.0 and higher, respectively. It was also found that at high KSCN concentrations, reactivation current profile skewed to higher potentials where this was attributed the formation of metastable pits, during the anodic scan of the test procedure. 相似文献
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