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首页> 外文期刊>Materials >Laser Engineered Net Shaping of Nickel-Based Superalloy Inconel 718 Powders onto AISI 4140 Alloy Steel Substrates: Interface Bond and Fracture Failure Mechanism
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Laser Engineered Net Shaping of Nickel-Based Superalloy Inconel 718 Powders onto AISI 4140 Alloy Steel Substrates: Interface Bond and Fracture Failure Mechanism

机译：基于镍的超合金的激光工程净成型在AISI 4140合金钢基材上的718粉末粉末：界面粘合和断裂损伤机理

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摘要

As a prospective candidate material for surface coating and repair applications, nickel-based superalloy Inconel 718 (IN718) was deposited on American Iron and Steel Institute (AISI) 4140 alloy steel substrate by laser engineered net shaping (LENS) to investigate the compatibility between two dissimilar materials with a focus on interface bonding and fracture behavior of the hybrid specimens. The results show that the interface between the two dissimilar materials exhibits good metallurgical bonding. Through the tensile test, all the fractures occurred in the as-deposited IN718 section rather than the interface or the substrate, implying that the as-deposited interlayer bond strength is weaker than the interfacial bond strength. From the fractography using scanning electron microscopy (SEM) and energy disperse X-ray spectrometry (EDS), three major factors affecting the tensile fracture failure of the as-deposited part are (i) metallurgical defects such as incompletely melted powder particles, lack-of-fusion porosity, and micropores; (ii) elemental segregation and Laves phase, and (iii) oxide formation. The fracture failure mechanism is a combination of all these factors which are detrimental to the mechanical properties and structural integrity by causing premature fracture failure of the as-deposited IN718.
机译：作为表面涂层和修复应用的潜在候选材料，通过激光工程网整形（镜头）沉积了基于镍的超合金Inconel 718（IN718），以研究两个之间的兼容性，沉积在美国钢铁研究所（AISI）4140合金钢基板上。具有焦点对杂交样品的界面粘合和断裂行为的不同材料。结果表明，两种不同材料之间的界面表现出良好的冶金键合。通过拉伸试验，所有裂缝发生在沉积的IN718部分而不是界面或基板中，这意味着沉积的层间粘合强度比界面粘合强度较弱。从Fractography使用扫描电子显微镜（SEM）和能量分散X射线光谱法（EDS），影响沉积部分的拉伸断裂衰竭的三个主要因素是（i）冶金缺陷如不完全熔化的粉末颗粒，缺乏 - 融合孔隙度和微孔; （ii）元素偏析和疏浚阶段，（III）氧化物形成。断裂损伤机制是通过引起沉积的in718的过早断裂衰竭来对机械性能和结构完整性有害的所有这些因素的组合。

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