Cryogenic 09MnNiDR steel was prepared using arc additive manufacturing technology. Following manufacture, its phase composition, microstructure, and crystal structure were analyzed by spectrometer, X-ray diffraction, optical microscopy, scanning electron microscopy, and transmission electron microscopy (TEM). In addition, the mechanical properties of arc additive manufactured 09MnNiDR were determined by microhardness measurements, tensile testing, and Charpy impact testing. Results showed that the material displayed good quality form without defects, such as holes, cracks, solid inclusions, incomplete fusion and penetration, or unfavorable shape and size. Furthermore, it displayed good internal metallurgical bonding and has a metallographic structure composed mainly of ferrite and granular bainite. High-resolution TEM suggested sharp grain edges, as well as a large number of crystal defects, such as dislocations and martensite–austenite islands in the 09MnNiDR crystal structure. The material showed relatively uniform microhardness distribution on the longitudinal and transverse sections with average values of 188.2 and 167.5 HV0.2, respectively. Also, the material exhibited superior mechanical properties. Prior to heat treatment, the material presented a yield strength of 436 MPa, a tensile strength of 552 MPa, an elongation of 30%, and a Charpy impact value of 96 J at −70°C.

使用电弧增材制造技术制备了低温09MnNiDR钢。制造后，通过光谱仪，X射线衍射，光学显微镜，扫描电子显微镜和透射电子显微镜（TEM）分析其相组成，显微结构和晶体结构。此外，通过显微硬度测量，拉伸测试和夏比冲击测试确定了电弧添加剂生产的09MnNiDR的机械性能。结果表明该材料显示出良好的质量形式，没有缺陷，例如孔，裂纹，固体夹杂物，不完全熔合和渗透，或不利的形状和尺寸。此外，它显示出良好的内部冶金结合并且具有主要由铁素体和粒状贝氏体组成的金相结构。高分辨率TEM显示出锋利的晶粒边缘，以及大量的晶体缺陷，例如09MnNiDR晶体结构中的位错和马氏体-奥氏体岛。该材料在纵向和横向截面上显示出相对均匀的显微硬度分布，平均值分别为188.2和167.5 HV0.2。而且，该材料还表现出优异的机械性能。在热处理之前，该材料的屈服强度为436 MPa，抗拉强度为552 MPa，伸长率为30％，在-70°C下的夏比冲击值为96J。该材料表现出优异的机械性能。在热处理之前，该材料的屈服强度为436 MPa，抗拉强度为552 MPa，伸长率为30％，在-70°C下的夏比冲击值为96J。该材料表现出优异的机械性能。在热处理之前，该材料的屈服强度为436 MPa，抗拉强度为552 MPa，伸长率为30％，在-70°C下的夏比冲击值为96J。