(1. 河南科技大學(xué) 材料科學(xué)與工程學(xué)院，洛陽 471023；
2. 有色金屬共性技術(shù)河南省協(xié)同創(chuàng)新中心，洛陽 471023；
3. 中國船舶重工集團公司 第七二五研究所，洛陽 471023)
摘 要: 采用鍛態(tài)工業(yè)純鈦TA1標(biāo)準(zhǔn)拉伸試樣，利用Gleeble-1500D熱模擬試驗機進行高溫拉伸試驗，研究其高溫拉伸性能；并用SEM觀察并分析工業(yè)純鈦拉伸試樣斷口形貌及其形成機制。結(jié)果表明：隨溫度升高，工業(yè)純鈦的屈服強度和抗拉強度分別從最初的83.7和94.8 MPa減小到19.3和29.6 MPa；伸長率增大，在950和1000 ℃時分別達到峰值36.3%和28%。在882.5 ℃相變轉(zhuǎn)變溫度以下，純鈦表現(xiàn)為以微孔聚集型剪切斷裂為特征的韌性斷裂，隨溫度的升高，達到相變點882.5 ℃，純鈦發(fā)生同素異構(gòu)轉(zhuǎn)變，并伴隨著塑性提高，以準(zhǔn)解理方式斷裂。
關(guān)鍵字: 工業(yè)純鈦；高溫拉伸；斷口形貌；形成機制
（1. School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, China;
2. Henan Collaborative Innovation Center of Non-ferrous Metal Generic Technology, Luoyang 471023, China;
3. The 725th Research Institute, Luoyang Ship Material Research Institute, Luoyang 471023, China）
Abstract:The high-temperature tensile tests of the forged commercially pure titanium TA1 were carried out to study its high-temperature tensile properties by Gleeble-1500D thermal simulated test machine. The tensile properties at high temperatures were investigated. The relevant fracture morphologies and formation mechanism were analyzed by SEM. The result shows that, with the increase of temperature, the yield strength and tensile strength of CP titanium TA1 decrease from the original values of 83.7 and 94.8 MPa to 19.3 and 29.6 MPa, respectively. The ductility reaches the peak values of 36.3% and 28% at the temperatures of 950 and 1000 ℃, respectively. Below the phase transition temperature of 882.5 ℃, the ductile fracture failure occurs for the CP titanium in the form of microvoid coalescence shear fracturing. With the further increase of temperature, allotropy transformations occur, and the ductility increases, resulting in the quasi-cleavage fracture as the major failure mechanism.
Key words: commercially pure titanium; high-temperature tensile; fracture morphology; formation mechanism
