加法和减法制造的中心内部特征对 inconel-718 零件微观结构和机械性能的影响

IF 3.4 4区 工程技术 Q1 ENGINEERING, MECHANICAL
Murat Isik, Isa Emami Tabrizi, Raja Muhammad Awais Khan, Mehmet Yildiz, E. Aydogan, B. Koc
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引用次数: 0

摘要

近年来,增材制造(AM)已开始用于制造航空航天、汽车和机械行业的关键应用的实际功能部件和组件。大多数复杂或组装的部件需要内部特征(IF),如孔、通道、槽或导向,以满足定位和配合要求。因此,了解和比较增材制造和常规加工的if的结构和力学性能是至关重要的。设计/方法/方法在本研究中,研究了用增材制造制造或增材制造(AMed)零件加工的Inconel 718 (Inc718)合金内部特征的机械和显微组织性能。结果表明:增材制造中心内特征(AM-IF)的平均极限抗拉强度(UTS)与加工中心内特征(M-IF)的平均极限抗拉强度基本相似;然而,由于AM-IF内部特征的表面粗糙度更大,M-IF的屈服强度大于AM-IF,这被认为超过了微观结构对力学性能的影响。数字图像相关分析(DIC)结果表明,在相同的应力水平下,AM-IF和M-IF条件下的应变值相似,但相同IF条件下的试样在IF周围有一个更局部的延展性区域,这一点得到了硬度测试结果的证实。但这不会改变整体延伸行为。研究了从建成(AB)和热处理(HT)试样到IF试样的显微组织演变。高温合金的显微组织为双峰型d相晶粒组织,而高温合金的显微组织为极细的枝晶组织,并伴有碳化物的存在。虽然两者的数值相近,但根据SEM图像,加工后的试样具有更高的细晶粒频率。独创性/价值研究表明,在AM过程中同时创建IF可以提供最终零件,保留极限抗拉强度和伸长率,但降低屈服强度。与M-IF的光滑内表面相比,AM-IF的UTS变化增加是由于内部特征附近的表面粗糙度。因此,本研究的结果被认为是有价值的行业在确定适当的生产策略与IF使用增材制造和后处理过程。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The effect of additively and subtractively created center internal features on microstructure and mechanical performance of inconel-718 parts
Purpose In recent years, additive manufacturing (AM) has started to be used for manufacturing real functional parts and assemblies for critical applications in aerospace, automotive, and machinery industries. Most complex or assembled parts require internal features (IF) such as holes, channels, slots, or guides for locational and mating requirements. Therefore, it is critical to understand and compare the structural and mechanical properties of additively manufactured and conventionally machined IFs. Design/methodology/approach In this study, mechanical and microstructural properties of Inconel 718 (Inc718) alloy internal features, manufactured either as-built with AM or machining of additively manufactured (AMed) part thereafter were investigated. Findings The results showed that the average ultimate tensile strength (UTS) of additively manufactured center internal feature (AM-IF) is almost analogous to the machined internal feature (M-IF). However, the yield strength of M-IF is greater than that of AM-IF due the greater surface roughness of the internal feature in AM-IF, which is deemed to surpass the effect of microstructure on the mechanical performance. The results of digital image correlation (DIC) analysis suggest that AM-IF and M-IF conditions have similar strain values under the same stress levels but the specimens with as built IF have a more locally ductile region around their IF, which is confirmed by hardness test results. But this does not change global elongation behavior. The microstructural evolution starting from as-built (AB) and heat-treated (HT) samples to specimens with IF are examined. The microstructure of HT specimens has bimodal grain structure with d phase while the AB specimens display a very fine dendritic microstructure with the presence of carbides. Although they both have close values, machined specimens have a higher frequency of finer grains based on SEM images. Originality/value It was shown that the concurrent creation of the IF during AM can provide a final part with a preserved ultimate tensile strength and elongation but a decreased yield strength. The variation in UTS of AM-IF increases due to the surface roughness near the internal feature as compared to smooth internal surfaces in M-IF. Hence, the outcomes of this study are believed to be valuable for the industry in terms of determining the appropriate production strategy of parts with IF using AM and postprocessing processes.
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来源期刊
Rapid Prototyping Journal
Rapid Prototyping Journal 工程技术-材料科学:综合
CiteScore
8.30
自引率
10.30%
发文量
137
审稿时长
4.6 months
期刊介绍: Rapid Prototyping Journal concentrates on development in a manufacturing environment but covers applications in other areas, such as medicine and construction. All papers published in this field are scattered over a wide range of international publications, none of which actually specializes in this particular discipline, this journal is a vital resource for anyone involved in additive manufacturing. It draws together important refereed papers on all aspects of AM from distinguished sources all over the world, to give a truly international perspective on this dynamic and exciting area. -Benchmarking – certification and qualification in AM- Mass customisation in AM- Design for AM- Materials aspects- Reviews of processes/applications- CAD and other software aspects- Enhancement of existing processes- Integration with design process- Management implications- New AM processes- Novel applications of AM parts- AM for tooling- Medical applications- Reverse engineering in relation to AM- Additive & Subtractive hybrid manufacturing- Industrialisation
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