Properties of Commercial Pure Titanium under Self-Heating and High-Pressure Heating Treatment
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摘要: 研究了压力对商业纯钛(CPTi)淬火过程的影响。分别制备了退火、水淬及高压处理样品用于比较，分析了相组成和显微组织，并测量了显微硬度。结果表明：高压淬火处理后，样品组织均为Ti马氏体；随着压力的增加，晶粒生长被抑制，显微硬度增加。与常压水淬样品相比，在低压处理后样品硬度没有显著升高。为了研究高压处理后样品的拉伸性能，对采用自加热方式的高温高压处理样品进行了拉伸试验。研究表明，处理后样品强度有所提高，并且延展性良好，接近原始样品。Abstract: The effect of pressure on quenching process of commercial pure titanium (CPTi) has been studied.Annealed, water quenched and high temperature and high pressure (HTHP) treated samples were prepared for comparison. The phase composition and microstructure were analyzed, and the microhardness was measured. Results showed that under high pressure quenching, specimens were all α-Ti martensite, and the grain refinement and microhardness were increased with the increasing pressure. For the pressure treated sample, there was no elevation on hardness compared with water quenched sample. Besides, the elongation of water quenched specimen was quite lower than that of the as-received sample. Herein, to investigate the ductility and tensile strength, tensile test was carried out by using samples treated by self-heating process under high pressure. The data showed that the strength of the treated sample was substantially promoted and the ductility was good, which was close to as-received sample.
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Key words:
- high pressure /
- pure titanium /
- tensile properties /
- grain refinement
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图 2 不同处理方法得到的CPTi样品的XRD谱
Figure 2. XRD patterns of CPTi samples after different treatments
图 4 1 173 K、不同压力下处理的GC样品的金相照片
Figure 4. Metallographs of the samples treated at 1 173 K under different pressures in graphite capsule
图 5 不同压力下自加热处理后SH样品的金相照片
Figure 5. Metallographs of the samples treated at 1 173 K under different pressures by self-heating
图 7 不同处理方法下CPTi样品马氏体板条尺寸变化
Figure 7. Grain size/thickness of CPTi samples after different treatments
图 8 不同压力下自加热法处理后样品的应力-应变曲线
Figure 8. Engineering stress-engineering strain curves of samples treated by self-heating under different pressures
表 1 采用自加热法在1 173 K、不同压力下处理的CPTi样品的拉伸性能
Table 1. Tensile properties of CPTi treated by self-heating at 1 173 K under different pressures
Condition UTS/MPa Yield stress/MPa Elongation/% AR 331.4 298.1 44.7 WQ 461.5 409.8 30.2 SH, 2 GPa, 1 173 K 470.2 425.4 42.3 SH, 3 GPa, 1 173 K 477.8 429.6 41.1 SH, 4 GPa, 1 173 K 480.2 446.4 40.2 SH, 5 GPa, 1 173 K 495.2 455.5 36.7 
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