ABSTRACT In the present research, different ratios of zirconium carbide (ZrC) and titanium carbide (TiC) powders were added to Vanadis 4 Extra (V4 Extra) steel powders. The composite powders (V4 Extra−ZrC−TiC) utilised vacuum sintering at 1275, 1300, 1325 and 1350°C for 1 h, respectively. The experimental results showed that good mechanical properties were obtained by the addition of 1.8 mass% ZrC and 1.2 mass% TiC (Z1.8T1.2) sintered at 1350°C for 1 h. Meanwhile, the apparent porosity was decreased to 0.02 vol.-%, and the transverse rupture strength (TRS) and hardness reached 1872 ± 24 MPa and 82.5 HRA, respectively. When optimally sintered V4 Extra composites (Z1.8T1.2) underwent a series of heat treatments, the TRS value was obviously enhanced to 2007 ± 17 MPa after quenching, and sub-zero and tempering heat treatments. Moreover, the sub-zero and heat treatments improved the distribution of MC carbides, which effectively enhanced the strength of sintered V4 Extra composites.

中文翻译：

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添加ZrC-TiC粉末的Vanadis 4超工具钢通过真空烧结、亚零和热处理的强化机制和腐蚀行为研究

摘要 在本研究中，将不同比例的碳化锆 (ZrC) 和碳化钛 (TiC) 粉末添加到 Vanadis 4 Extra (V4 Extra) 钢粉中。复合粉末（V4 Extra-ZrC-TiC）分别在 1275、1300、1325 和 1350°C 下真空烧结 1 小时。实验结果表明，加入 1.8% 的 ZrC 和 1.2% 的 TiC（Z1.8T1.2）在 1350°C 下烧结 1 h 获得了良好的机械性能。同时，表观孔隙率降低至 0.02 vol.-%，横向断裂强度 (TRS) 和硬度分别达到 1872 ± 24 MPa 和 82.5 HRA。优化烧结的V4 Extra复合材料（Z1.8T1.2）经过一系列热处理后，经淬火、亚零和回火热处理后TRS值明显提高至2007±17 MPa。而且，