Effects of quenching process on microstructure, mechanical properties and magnetic susceptibility in Zr 1Mo alloy fabricated by powder bed fusion process
Effects of quenching process on microstructure, mechanical properties and magnetic susceptibility in Zr 1Mo alloy fabricated by powder bed fusion process
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DOI：
10.1016/j.matdes.2019.108356
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发表时间：
2020-02
影响因子：
8.4
通讯作者：
Xiaohao Sun;D. Liu;Weiwei Zhou;N. Nomura;H. Doi;Y. Tsutsumi;T. Hanawa
中科院分区：
文献类型：
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作者：
Xiaohao Sun;D. Liu;Weiwei Zhou;N. Nomura;H. Doi;Y. Tsutsumi;T. Hanawa
为了抑制磁共振成像（MRI）中的“磁化率伪影”，提高生物医学结构应用的机械可靠性，实现复杂形状医疗器械的定制化，采用高相对密度（约1.0%）低磁Zr-1 Mo合金构建了一种新型的高磁致密度（约1.0%）低磁Zr-1 Mo合金。99.9%）的激光粉末床熔融工艺（L-PBF）进行了各种热处理条件下，然后水淬。Zr-1 Mo（wt%）合金经淬火后，由针状α′组织转变为篮织α + β组织，并根据淬火条件的不同，保留了独特的α +超细（α′ + α″）马氏体组织或保留了α +针状α′组织。X射线衍射（XRD）和高分辨透射电子显微镜（HR-TEM）分析表明，在1123 K温度下，合金组织中保留了独特的α +超细（α′ + α″）马氏体组织。应力诱导的β-α′相变和β-α″相变之间的竞争导致了这种独特的微观结构。这种独特的微观结构有助于在强度（UTS：822 MPa）和延展性（伸长率：11.7%）之间实现良好的平衡。淬火Zr-1 Mo（wt%）合金构建的体积磁化率保持较低（约1.01 × 10−4），表明MRI兼容性良好。结果表明，Zr-1 Mo（wt%）合金在1123 K淬火后的磁化率为χα″> χβ> χ α> χα′> χω。
In order to depress the “susceptibility artifacts” in magnetic resonance imaging (MRI), improve the mechanical reliability for biomedical structural applications and realize tailor-made medical devices with complex shape, low magnetic Zr-1Mo(wt%) alloy builds with high relative density (c.a. 99.9%) fabricated by laser powder bed fusion process(L-PBF) were subjected to various heat treatment conditions followed by water quenching. After quenching process acicular α′ microsturcture in as-build Zr-1Mo(wt%) alloy builds changed to basket weave α + β structure, unique retained α + ultra fine (α′ + α″) martensite structure or retained α + acicular α′ microsturcture depending on quenching conditions. X-ray diffraction (XRD) and high resolution-transmission electron microscope(HR-TEM) revealed a unique retained α + ultra fine (α′ + α″) martensite microstructure in 1123 K specimens. The stress-induced competition between β to α′ transformation and β to α″ transformation contributed to this unique microstructure. This unique microstructure contributed to a good balance between strength (UTS:822 MPa) and ductility (Elongation:11.7%). The volume magnetic susceptibility of quenched Zr-1Mo(wt%) alloy builds maintained low(about 1.01 × 10−4) indicating good MRI compatibility. The magnetic susceptibility of each phase was modified to be χα″> χβ> χα> χα′> χω.Zr-1Mo(wt%) alloy quenched from 1123 K will be an promising candidates for tailor made devices under MRI environments.