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首页> 外文会议>Materials Research Society symposium >Microstructural, Mechanical Properties and Corrosion Resistance of Ferritic Stainless Steel Welded by GTAW and Coated by Flame Spraying
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Microstructural, Mechanical Properties and Corrosion Resistance of Ferritic Stainless Steel Welded by GTAW and Coated by Flame Spraying

机译：铁陶瓷不锈钢的微观结构，机械性能和耐腐蚀性，通过火焰喷涂涂覆

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摘要

Ferritic stainless steels are widely used in transportation industry due to their exceptional performance regarding mechanical and corrosion properties. However, after a welding process, joints feature the sensitizing phenomenon because of the heat exchange from the torch affecting mechanical properties and corrosion resistance. This work describes the behavior firstly of mechanical properties of weld joints of ferritic stainless steel as base material without and with filler material (AISI 308L) by gas tungsten arc welding (GTAW). Operating parameters such as arc voltage, welding currrent, welding speed, feed speed, shielding gas flow were evaluated. Secondly, samples of weld joints were coated by flame spraying of composite particles in order to reduce the weight loss induced by corrosion in a salt spray (fog) apparatus. Changes induced from GTAW on the heat affected zone and Thermal Spraying on corrosion resistance, were monitored by optical and scanning electron microscopy, microhardness and longitudinal tensile testing. Results show that GTAW helps to control the size and the microstructure of heat affected zone improving simultaneously the mechanical properties. Meanwhile, welded joints covered by composite coatings feature a lower damage provided that the ceramic phase has been homogeneously dispersed.
机译：由于其关于机械和腐蚀性能的特殊性能，铁素体不锈钢广泛用于运输业。然而，在焊接过程之后，接头采用敏化现象，因为从影响机械性能和耐腐蚀性的焊炬的热交换。这项工作首先通过气体钨电弧焊接（GTAW）为基础材料的焊接接头作为基材的焊接接头的机械性能的行为。评估了诸如电弧电压，焊接电流，焊接速度，进给速度，屏蔽气流的操作参数。其次，通过火焰喷涂复合颗粒的火焰喷涂涂覆焊接接头样品，以减少通过盐雾（雾）装置中的腐蚀引起的重量损失。通过光学和扫描电子显微镜，微硬度和纵向拉伸试验监测从GTAW对热影响区域和耐腐蚀性进行热喷涂的变化。结果表明，GTAW有助于控制热影响区同时改善的尺寸和微观结构。同时，复合涂层覆盖的焊接接头具有较低的损坏，条件是陶瓷相均匀分散。

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