Study on Modification of TiAl Alloy for Automotive Turbocharger
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摘要: 分别采用常规铸造法和两步法制备汽车涡轮增压器用Ti-47.5Al-2.5V-1Cr-0.1Y合金试样,并进行了显微组织、力学性能、耐腐蚀性能和抗疲劳性能的测试与对比分析。结果表明,与常规铸造相比,两步法的制备方法有利于细化晶粒、避免气孔和显微疏松等铸造缺陷,提高合金的力学性能、耐腐蚀性能和抗疲劳性能;两步法制备的合金的室温抗拉强度增加了33.28%、室温冲击吸收功增加了33.33%、疲劳寿命增加了95.34%、腐蚀电位右移了236 mV。
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关键词:
- 汽车涡轮增压器 /
- Ti-47.5Al-2.5V-1Cr-0.1Y合金 /
- 常规铸造法 /
- 两步法
Abstract: The Ti-47.5Al-2.5V-1Cr-0.1Y alloy samples for automobile turbocharger were respectively prepared by common casting and two-step method,and the microstructures,mechanical properties,corrosion resistance and fatigue resistance for the samples by the 2 methods mentioned above were tested and contrastively analyzed.The results show that the crystalline grain can be refined and the casting defects such as pores and microporosity are avoided,and the mechanical properties,corrosion resistance and fatigue resistance of the alloy are improved by two-step method,compared to the common casting method.For sample prepared by the two-step method,the tensile strength and impact absorbing energy at room temperature respectively increases by 33.28% and 33.33%,the fatigue life increases by 95.34% and the corrosion potential changes 236 mV to the positive direction. -
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