Improving the corrosion and wear resistance of grey cast iron components by surface welding with duplex stainless steel using regulated gas metal arc welding: Influence of dilution on corrosion properties
Improving the corrosion and wear resistance of grey cast iron components by surface welding with duplex stainless steel using regulated gas metal arc welding: Influence of dilution on corrosion properties
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DOI：
10.1002/mawe.201800151
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发表时间：
2018-12
影响因子：
1.1
通讯作者：
U. Reisgen;Rahul Sharma;Stephan Wieland;Erick Gonzalez;Matthias Oechsner;G. Andersohn;J. Ellermeier;Marius Siebers;B. Heider
中科院分区：
文献类型：
--
作者：
U. Reisgen;Rahul Sharma;Stephan Wieland;Erick Gonzalez;Matthias Oechsner;G. Andersohn;J. Ellermeier;Marius Siebers;B. Heider
采用规定的熔化极气体保护焊工艺，对双相不锈钢和片状灰铸铁进行了表面焊接，以产生厚的（几毫米）保护表面层。作为主要参数，研究了保护气体（氩氦混合物）的组成以及预热温度对耐腐蚀性的影响。向保护气体中添加氦气和预热基础材料都增加了热输入，降低了冷却速率，并导致更高的稀释度。这会导致热影响区的硬度降低并防止开裂。但表层碳化物的形成和比例增加。通过浸泡试验和动电位极化测试，研究了这些工艺参数对表层和热影响区组织的影响以及对人工海水中腐蚀行为的影响。表面层的存在大大提高了母材片状灰铸铁的腐蚀性能，但不如双相不锈钢。通过额外的金相研究，对腐蚀机制进行了研究。腐蚀机理受表面层中相分布和碳化物形成的广泛影响。
Surface welding of duplex stainless steel on lamellar grey cast iron was performed to produce thick (several millimetres) protective surface layers with a regulated gas metal arc welding process. As dominant parameters, the influence of the composition of the shielding gas (argon‐helium mixture) as well as preheating temperature on the corrosion resistance were investigated. Both the addition of helium to shielding gas and preheating of the base material increase the heat input and reduce the cooling rates and result in higher dilution. This leads to reduced hardness in the heat affected zone and prevents cracking. However, the formation and portion of carbides in the surface layers increase. The influence of these parameters on the microstructure in the surface layers as well as in the heat affected zone and the influence on the corrosion behaviour in artificial seawater were investigated with immersion tests and potentiodynamic polarization measurements. The corrosion properties of the parent lamellar grey cast iron were greatly enhanced by the surface layers, but inferior to duplex stainless steel. With additional metallographic investigations the corrosion mechanisms were investigated. The corrosion mechanisms are extensively influenced by the phase distribution in the surface layers and by the formation of carbides.