摘要:
为了探究TiC添加量对选区激光融化（SLM）技术制备的CX不锈钢微观组织和力学性能的影响，利用XRD、SEM、EBSD等表征手段对不同TiC含量（0、2wt.%、4wt.%、6wt.%）的CX不锈钢样品进行分析。结果表明：TiC的加入对CX不锈钢的晶粒尺寸有明显影响从而影响其力学性能。通过EBSD分析可知：随着TiC含量的增加，CX不锈钢的平均晶粒尺寸由2.08μm分别减小到0.94 μm、0.66 μm、0.71 μm，最多减小了68.3%。CX不锈钢的硬度随着TiC含量的增加而逐渐增强，最高可达491HV0.5，相比原始打印态CX不锈钢提高了63.1%；拉伸强度随着TiC含量的增加先提高后降低，当TiC含量为4wt.%时，达到最大值为1574 MPa，相比原始打印态CX不锈钢提高了58.2%；随着TiC含量的增加，断裂延伸率先提高后降低，当TiC含量为2wt.%时，达到最大值为16.8%，相比原始打印态CX不锈钢提高了29%。当TiC含量为4%时，CX不锈钢具有较优的综合力学性能：屈服强度为1081 MPa、抗拉强度为1574 MPa、硬度为360 HV0.5，和原始打印态CX不锈钢相比，分别提高了21.1%、58.2%和21.5%。
Abstract:
To investigate the effect of TiC addition on the microstructure and mechanical properties of CX stainless steel fabricated by selective laser melting (SLM), samples with different TiC contents (0, 2wt.%, 4wt.%, and 6wt.%) were analyzed using characterization techniques such as XRD, SEM, and EBSD. The results indicate that the addition of TiC significantly influences the grain size of CX stainless steel, thereby affecting its mechanical properties. EBSD analysis reveals that as the TiC content increases, the average grain size of CX stainless steel decreases from 2.08 μm to 0.94 μm, 0.66 μm, and 0.71 μm, respectively, with a maximum reduction of 68.3%. The hardness of CX stainless steel gradually increases with higher TiC content, reaching a maximum of 491 HV0.5, which represents a 63.1% improvement compared to the original printed CX stainless steel. The tensile strength initially increases and then decreases with increasing TiC content, peaking at 1574 MPa when the TiC content is 4wt.%, a 58.2% compared to the original printed CX stainless steel. The elongation at fracture first increases and then decreases with higher TiC content, reaching a maximum of 16.8% at 2wt.% TiC, a 29% improvement compared to the original printed CX stainless steel. When the TiC content is 4wt.%, CX stainless steel exhibits optimal comprehensive mechanical properties: yield strength of 1081 MPa, tensile strength of 1574 MPa, and hardness of 360 HV0.5, representing improvements of 21.1%, 58.2%, and 21.5%, respectively, compared to the original printed CX stainless steel.
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