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热压烧结参数对Ti35421组织与力学性能的影响

Effect of hot press sintering parameters on the microstructure and mechanical properties of Ti35421

  • 摘要: 采用热压烧结制备了Ti-3Al-5Mo-4Cr-2Zr-1Fe(Ti-35421),为了进一步提高热压烧结制备钛合金的质量,通过正交实验探究了烧结温度、烧结压力和保温时间对于热压烧结Ti35421组织形貌和力学性能的影响规律,并得出了最优烧结参数。结果表明:温度、压力是影响烧结体微观组织与力学性能的重要因素。提高温度,有利于合金的致密化,从而获得更高的密度和硬度。然而,温度升高也会导致晶粒长大,进而降低合金的压缩性能。适当的温度和较高的压力可以显著提高Ti35421的综合力学性能。在烧结参数为温度900 ℃,烧结压力45 MPa,烧结时间2 h的条件下,合金的压缩性能达到最佳,屈服强度为1248 MPa,断裂应变为23.03%。

     

    Abstract: Ti-3Al-5Mo-4Cr-2Zr-1Fe (Ti-35421) was prepared using hot press sintering. In order to enhance the quality of titanium alloys prepared through this method, orthogonal experiments were conducted to investigate the effects of sintering temperature, sintering pressure, and holding time on the microstructure and mechanical properties of hot-pressed sintered Ti35421. The study aimed to determine the optimal sintering parameters. The results revealed that temperature and pressure play crucial roles in influencing the microstructure and mechanical properties of the sintered alloy. Increasing the temperature promotes alloy densification, resulting in higher density and hardness. However, elevated temperatures can also lead to grain growth, which reduces the compressive properties of the alloy. By using an appropriate temperature and higher pressure, the overall mechanical properties of Ti35421 can be significantly improved. The alloy exhibited the best compressive properties when sintered at a temperature of 900 °C, a pressure of 45 MPa, and a duration of 2 hours. Under these conditions, the alloy demonstrated a yield strength of 1248 MPa and a fracture strain of 23.03%.

     

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