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首页> 外文期刊>International Journal of Electrochemical Science >Effect of Heat Treatment Temperatures on Microstructure and Corrosion Properties of Inconel 625 Weld Overlay Deposited by PTIG
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Effect of Heat Treatment Temperatures on Microstructure and Corrosion Properties of Inconel 625 Weld Overlay Deposited by PTIG

机译：热处理温度对PTIG沉积Inconel 625堆焊层组织和腐蚀性能的影响

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摘要

Inconel 625 alloy was cladded on the substrate of AISI 4130 steel using pulsed tungsten inert gaswelding (PTIG) technique. The effects of post weld heat treatment (PWHT) temperatures onmicrostructure evolution and electrochemical corrosion performance of the weld overlay were studiedby scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDS) and electrochemicalmeasures. The microstructure of as-welded cladding is mainly composed of -Ni columnar grains andprecipitates, such as laves and MC. There is no obvious change in microstructure was observedbetween the rough welded overlay and the overlay after PWHT at 650 With an increase in PWHTtemperature, the size of laves phase appear to decrease, and a small number of needle shaped phaseappear in the cladding after PWHT at 750 When the temperature up to 850 a larger number of phase precipitate at interdendritic regions of the cladding. For PWHT at 950 the phase coarsensobviously. The electrochemical testing results indicate that heat treatments have noticeable influenceon the corrosion parameters, such as charge transfer (Rct), self - corrosion potential (Ecorr), pittingpotential (EPit), and passivation current density (Ip). The higher heat treatments temperature isdetrimental to the corrosion resistance, since heat treatments boost the formation of precipitate phase.
机译：使用脉冲钨极惰性气体保护焊（PTIG）技术将Inconel 625合金包覆在AISI 4130钢的基底上。通过扫描电子显微镜（SEM），能量色散X射线分析（EDS）和电化学方法研究了焊后热处理（PWHT）温度对堆焊层组织演变和电化学腐蚀性能的影响。焊接后的熔覆层的显微组织主要由-Ni柱状晶粒和熔体组成，例如熔体和MC。 650℃时，粗焊堆焊层与PWHT后堆焊层之间没有观察到微观组织变化。随着PWHT温度的升高，熔体相的尺寸似乎减小，在750℃进行PWHT后，熔覆层中出现少量针状相当温度达到850℃时，在包层的树突间区域中析出大量相。对于950的PWHT，相位明显变粗。电化学测试结果表明，热处理对腐蚀参数有显着影响，例如电荷转移（Rct），自腐蚀电位（Ecorr），点蚀电位（EPit）和钝化电流密度（Ip）。较高的热处理温度不利于耐腐蚀性，因为热处理会促进沉淀相的形成。

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