(1. 大連理工大學(xué) 材料科學(xué)與工程學(xué)院，大連 116024；
2. 大連盛輝鈦業(yè)有限公司，大連 116600)
摘 要: 分析對比不同工序后醫(yī)用U型釘用TC4鈦合金棒材的組織性能。結(jié)果表明：熱拔和高溫退火工藝對棒材的再結(jié)晶組織有明顯影響，而雙曲線矯直和低溫退火工藝對棒材力學(xué)性能的影響較大。730~750 ℃高溫退火2 h后，熱拔材的再結(jié)晶程度比較充分；580~700 ℃低溫退火2 h后，矯直材的光學(xué)顯微組織未發(fā)生明顯變化，但硬度明顯減小。在730~750 ℃高溫退火、580 ℃低溫退火的條件下對棒材的顯微組織進(jìn)行調(diào)控，可獲得符合醫(yī)用TC4鈦合金力學(xué)性能要求的棒材，且由其加工的U型釘縮口尺寸可控制在0.05 mm以下。
關(guān)鍵字: TC4鈦合金；U型釘；縮口尺寸；顯微組織；力學(xué)性能
（1. School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China;
2. Dalian Suntec Titanium Co., Ltd., Dalian 116600, China）
Abstract:Comparing with microstructure and mechanical property of TC4 alloy bar after different procedures. The results show that the recrystallization microstructure of the bar is found to be affected significantly by high temperature annealing, while the mechanical property is affected by hyperbola straightening and low temperature annealing. The recrystallization degree of hot drawing bar is sufficient after being annealed at 730-750 ℃ for 2 h. Optical microstructure of straightening bar does not change significantly, but the Vickers hardness decreases evidently after being annealed at 580-700 ℃ for 2 h. When the high and low temperature annealing are performed at 730-750 ℃ and 580 ℃, respectively, the mechanical property of the bar is suitable for the medical TC4 alloy based on the microstructure control. In addition, the necking size of U-shaped nail processed from the bar is desirable to be lower than 0.05 mm.
Key words: TC4 titanium alloy; U-shaped nail; necking size; microstructure; mechanical property
