In this study, we propose Fe–Mn-Cr/Ni as an economical drill collar overlay material applied via metal-cored arc welding (MCAW). A series of Fe–Mn-Cr/Ni overlay alloys with different Ni contents were prepared by MCAW, and their microstructure, non-magnetic, and wear properties were systematically investigated. The results show that the addition of Ni element can effectively improve the austenitization of the Fe–Mn-Cr/Ni overlay alloy and inhibit the formation of ferromagnetic hexagonal martensite (ε) and body-centered ferrite (α), thus improving the non-magnetic properties of the Fe–Mn-Cr/Ni overlay. With the increase of Ni addition from 0.6 to 4.7 wt.%, the average grain size gradually increases from 21.69 to 49.97 µm, and the overlay microstructure gradually evolves from columnar-like ε-martensite to wide ε-martensite band and eventually almost austenite. This change in microstructure as Ni content increases contributes to the reduction of relative permeability from 2.225 to 1.057 due to the increased austenite contents, at the cost of increased wear rate from 2.61 × 10⁻⁵ to 4.55 × 10⁻⁵ mm³·N⁻¹·m⁻¹ due to the decay of wear-resistant ε-martensite skeleton. By controlling the Ni content, this work demonstrates the potential of preparing Fe-based austenitic wear-resistant layers with high Mn content and broadens the scope of austenitic non-magnetic deposited alloys for surface overlay strengthening or repairing of Fe-based non-magnetic drilling tools.

在这项研究中，我们提出 Fe-Mn-Cr/Ni 作为一种经济的钻铤堆焊材料，通过金属芯电弧焊 (MCAW) 进行应用。采用MCAW制备了一系列不同Ni含量的Fe-Mn-Cr/Ni堆焊合金，并系统研究了它们的显微组织、无磁和磨损性能。结果表明，Ni元素的添加能有效提高Fe-Mn-Cr/Ni堆焊合金的奥氏体化程度，抑制铁磁六方马氏体（ε）和体心铁素体（α）的形成，从而提高非铁素体的非晶态性。 Fe-Mn-Cr/Ni 覆盖层的磁性。随着Ni添加量从0.6%增加到4.7%，平均晶粒尺寸从21.69μm逐渐增大到49.97μm，堆焊组织逐渐从柱状ε马氏体演变为宽ε马氏体带，最终几乎为奥氏体。随着镍含量增加，微观结构发生变化，由于奥氏体含量增加，导致相对磁导率从 2.225 降低至 1.057，代价是磨损率从 2.61 × 10 ^-5增加至 4.55 × 10 ^-5 mm ³ ·N ^{- 1} ·m ^-1由于耐磨的ε-马氏体骨架的衰变。通过控制Ni含量，该工作展示了制备高Mn含量铁基奥氏体耐磨层的潜力，并拓宽了奥氏体非磁性熔敷合金用于铁基非磁钻孔表面堆焊强化或修复的范围工具。