Microstructure–Property Correlation in a Laser Powder Bed Fusion Processed High‐Strength AF‐9628 Steel,Advanced Engineering Materials

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Microstructure–Property Correlation in a Laser Powder Bed Fusion Processed High‐Strength AF‐9628 Steel
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2020-09-05 , DOI: 10.1002/adem.202000845
Priyanshi Agrawal ₁ , Shivakant Shukla ₁ , Saket Thapliyal ₁ , Priyanka Agrawal ₁ , Saurabh S. Nene ₁ , Rajiv S. Mishra ₁ , Brandon A. McWilliams ₂ , Kyu C. Cho ₂

Affiliation

Laser powder bed fusion additive manufacturing (LPBF‐AM) of a low‐alloy, high‐performance AF‐9628 steel results in exceptionally high strength and good ductility. The reasons for such mechanical properties are investigated through detailed microscopy performed at several length scales. Thus, the characterization of melt pool, porosity, grain morphology, phases, and dislocations is performed in the as‐printed material. The as‐printed material consists of only 0.004 vol% of uniformly distributed porosity, single‐phase martensitic laths with an average lath size of ≈2.5 μm, the absence of carbides indicating interstitial trapping of C atom, and high dislocation density in the martensitic laths. Experimental data through microscopy are then fed in analytical models for calculating strengthening contributions from various strengthening mechanisms. Calculated yield strength agrees well with experimentally determined value, and therefore, activation of various strengthening mechanisms is established in as‐printed AF‐9628.

中文翻译：

激光粉末床融合处理的高强度AF-9628钢的微观结构-性能关联

低合金，高性能AF-9628钢的激光粉末床熔合增材制造（LPBF-AM）可实现极高的强度和良好的延展性。通过在几种长度尺度上进行的详细显微镜检查，研究了这种机械性能的原因。因此，在印刷材料中对熔池，孔隙率，晶粒形态，相和位错进行表征。印制后的材料仅包含0.004％（体积）的均匀孔隙度，单相马氏体板条，平均板条尺寸约为≈2.5μm，无碳化物表明C原子被间隙俘获，并且马氏体板条中位错密度高。然后将通过显微镜得到的实验数据输入分析模型中，以计算各种强化机制的强化贡献。

更新日期：2020-09-05

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