In situ synthesis of TiC-NiCr cermets during selective laser melting (SLM) was investigated. Powder mixture consisting Ti, C and Ni80Cr20 solid solution was prepared by milling process to attain the nominal composition of TiC-40 wt% NiCr. Feedstock powder was milled for 7 h by a high energy ball mill. SLM process was applied at three scanning speeds and the effect of input energy density on phase formation, microstructure and hardness of resultant samples was evaluated. Morphology of the powders and microstructure of in situ fabricated cermets were investigated by field emission electron microscopy (FESEM), and structural evolution during SLM was studied by X-ray diffractometery (XRD). The results showed that TiC can be synthesized during SLM process even at relatively low energy densities and the formation mechanism of TiC phase is affected by the input energy density. Relative density of the samples increased from 88.24% to 98.53% with increasing the energy density from 138.7 to 346.7 Jmm⁻³. The sample fabricated by SLM process using the maximum energy density of 346.7 Jmm⁻³showed the highest mean microhardness value of 1289 HV.

研究了选择性激光熔化（SLM）过程中TiC-NiCr金属陶瓷的原位合成。通过研磨工艺制备由Ti，C和Ni80Cr20固溶体组成的粉末混合物，以达到TiC-40 wt％NiCr的标称组成。将原料粉末通过高能球磨机研磨7小时。SLM工艺以三种扫描速度应用，并评估了输入能量密度对所得样品的相形成，微观结构和硬度的影响。通过场发射电子显微镜（FESEM）研究了粉末的形貌和现场制备的金属陶瓷的微观结构，并通过X射线衍射仪（XRD）研究了SLM过程中的结构演变。结果表明，即使在较低的能量密度下，TiC仍可以在SLM过程中合成，并且TiC相的形成机理受输入能量密度的影响。样品的相对密度从88.24％增加到98.53％，能量密度从138.7 Jmm增加到346.7 Jmm⁻³。使用最大能量密度为346.7 Jmm ^-3的SLM工艺制造的样品显示出最高的平均显微硬度值为1289 HV。