利用激光定向能量沉积技术可以实现压铸模具的定点修复和再制造，然而以 H13 钢为代表的中碳热作模具钢在激光成形过程中会生成具有本征脆性的高碳马氏体，导致成形开裂、塑性不足等问题。 对此，通过成形前预混合在 H13 钢中 引 入 了 微 量 IN718 合 金 粉 末 ，从而 提 高 成 形 过 程 中 残 余 奥 氏 体 的 镍 元 素 和 铬 元 素 含 量 ，降低 其 马 氏 体转变 温 度 ， 有效 抑 制 了 高 碳 马 氏 体 的 形 成 。 拉伸 结 果 显 示 ， 改性 后 H13 钢的 屈 服 强 度 为 1176 MPa ， 抗拉 强 度为 1615 MPa，断裂伸长率达 10.6%，综合性能优于现有激光定向能量沉积 H13 钢。 微观组织分析表明，成形样块中奥氏体呈零散分布，在奥氏体分布的区域有镍和铬元素富集。 零散分布的残余奥氏体可以协调基体变形，提高材料内部变形的均匀性。 同时，镍元素和铬元素的引入有效提高了残余奥氏体的稳定性，延缓了高碳马氏体形成。

Laser-directed energy deposition technology can be used to achieve fixed-point repair and remanufacturing of die-casting molds. However, during the laser forming process of medium-carbon hot work die steels, such as H13 steel, high-carbon martensite with intrinsic brittleness is generated, leading to problems such as cracking and insufficient plasticity. In response, a small amount of IN718 alloy powder was premixed and introduced into H13 steel before forming. This increased the contents of nickel and chromium in the retained austenite during the forming process, lowered its martensitic transformation temperature, and effectively inhibited the formation of high-carbon martensite. The tensile test results show that the yield strength of the modified H13 steel is 1 176 MPa, the tensile strength is 1 615 MPa, and the elongation at break reaches 10.6% . The comprehensive performance is superior to that of existing laser-directed energy deposition methods for H13 steel. Microstructural analysis indicates that the austenite in the formed sample blocks is scattered and that there is an enrichment of nickel and chromium in the regions where the austenite is distributed. The scattered retained austenite can coordinate the deformation of the matrix and improve the uniformity of the internal deformation of the material. Moreover, the introduction of nickel and chromium effectively improves the stability of the retained austenite and delays the formation of high-carbon martensite.