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摘要：
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通过高温拉伸试验,研究拉伸参数对TC4高温变形行为的影响。结果表明:该材料在保温时间为15 min,拉伸温度为900℃,初始应变速率为5×10-3s-1条件下可获得最佳的热变形性能。工业生产时,可将保温时间延长至30 min,将温度提高至900~920℃,初始应变速率增加到1×10-3~1×10-2s-1范围内。采用OM和SEM分析了保温时间、初始应变速率和温度对微观组织的影响,并对不同变形阶段的组织演变和不同温度条件下的断口形貌进行了分析。研究结果表明:可适当增加保温时间和变形温度,使工件在高速率范围内成形,提高零件的生产效率,并从微观组织方面研究了存在该变形条件的内在原因。
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Elevated temperature tensile test was used to investigate the influence of forming parameters on deformation behavior of TC4,and the optimal deformation condition was identified,that is: pre-heating(and holding) at 900 ℃ for 15 min,forming at 900 and with an initial strain rate of 5×10-3s-1.It was found that for commercial production,the suitable processing window can be slightly adjusted or widened: the holding time can be prolonged to 30 min,the temperature can be raised from 900 to 920 ℃,and the initial strain rate can be increased from 1×10-3 to 1×10-2 s-1.OM and SEM was used to analyze the microstructure evolution under different holding time,original strain rates and temperatures.The microstructure of different strain and the fractograph of different temperature were also presented.The result indicates that the part can deform in high strain rate range under longer holding time and higher temperature,so the production efficiency is improved.At last,the internality reason of that deformation condition was presented from microstructure study.
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作者简介：
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参考文献：
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