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首页> 外文期刊>ISIJ international >Microstructural Study for Optimization of Ce Content of Austempered Ductile Iron (ADI) Weld Metal
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Microstructural Study for Optimization of Ce Content of Austempered Ductile Iron (ADI) Weld Metal

机译：奥氏体球墨铸铁（ADI）焊接金属中Ce含量优化的显微组织研究

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摘要

Bead-on- plate welding was performed on 20 mm thick cast ductile iron plate in shielded metal arc welding using three different levels (0.05, 0.1, 0.2%) of Ce and one without Ce containing developed coated electrodes after establishing weld procedure as per AWS (D11). As-welded Dl weldments were given isothermal heat treatment at two different austempering temperatures (300℃ and 350℃) for 1.5 h, 2 h and 2.5 h holding time. Microstructures of as-deposited and austempered weld metals were characterized by OM, SEM, TEM, XRD analysis and microhardness testing. Results show that weld metal containing 0.1% Ce attributed lowest amount of ledeburitic carbide in as-deposited condition and maximum vol.% of retained austenite (46.7%) after austempering heat treatment compare to other two levels of Ce. Since maximum amount of retained austenite is the desirable microstructure after austempering heat treatment, 0.1% Ce is considered as the optimum one in Dl weld metal.
机译：在按照AWS建立焊接程序后，使用三种不同含量（0.05％，0.1％，0.2％）的Ce和一种不含Ce的发达涂层电极，在屏蔽金属电弧焊中对20 mm厚铸铁球墨铸铁板进行珠焊。 （D11）。在两种不同的回火温度（300℃和350℃）下对焊好的D1焊件进行1.5 h，2 h和2.5 h的保温时间。通过OM，SEM，TEM，XRD分析和显微硬度测试来表征沉积和回火焊缝金属的显微组织。结果表明，与其他两个含量的Ce相比，含0.1％Ce的焊缝金属在沉积状态下具有最低的碳化物含量，而奥氏体热处理后残留的奥氏体的最大体积含量为46.7％。由于残余奥氏体的最大量是奥氏体热处理后理想的显微组织，因此0.1％Ce被认为是D1焊接金属中的最佳组织。

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