热处理对Ti-2.5A1-2Zr-1Fe合金显微组织和力学性能的影响  

Effects of Heat Treatment on Microstructure and Mechanical Properties of Ti-2.5A1-2Zr-1Fe Alloy

作　　者：李鹏[1] 齐风华[1] 李瑞武 孙朋朋[1] LI Peng;QI Fenghua;LI Ruiwu;SUN Pengpeng(Luoyang Ship Material Research Institute,Luoyang 471023,China)

机构地区：[1]中国船舶重工集团公司第七二五研究所,河南洛阳471023

出　　处：《热加工工艺》2018年第24期226-229,233,共5页Hot Working Technology

摘　　要：研究了厚度为4 mm的Ti-2.5A1-2Zr-1Fe合金板材经500～1000℃电阻炉热处理后的力学性能、显微组织和N、H、O化学元素含量的变化。结果表明:合金再结晶温度约为800℃,显微组织从拉长α+等轴α+点状晶间β向等轴α+点状β转变;力学性能变化和显微组织变化相吻合,热处理温度小于800℃时随着热处理温度的升高,屈服强度和抗拉强度缓慢下降。温度大于800℃后,屈服强度和抗拉强度变得复杂,二者变化趋势也不相同,屈服强度对热处理温度更为敏感;未发生相变之前,板材伸长率和最小弯曲直径未发生明显变化,相变后性能均迅速下降;不同热处理温度下保温30 min,N、H、O成分未发生明显变化。The changes of mechanical properties, microstructure and N、H、O element content of Ti-2.5A1-2Zr-1Fe alloy sheet with thickness of 4 mm after heat treatment at 500-1000 ℃ were studied. The results show that, the recrystallization temperature is about 800 ℃, the microstructure changes from elongated α+equiaxed α+dot intergranular β to equiaxed α+ dotβ. The change of mechanical properties coincides with the change of microstructure. When the heat treatment temperature is less than 800 ℃, the yield strength and tensile strength decrease slowly with the increase of heat treatment temperature. When the temperature is higher than 800 ℃, the variation of yield strength and tensile strength becomes complex, larger and the trend is different. The yield strength is more sensitive to the heat treatment temperature. The elongation and the minimum bending diameter of the sheet do not change significantly before phase transformation, and the properties of the sheet decreases rapidly after phase transformation. Under different heat treatment temperatures for 30 min, the composition of N, H and O do not change significantly.

关 键 词：热处理 Ti-2.5A1-2Zr-1Fe 组织 力学性能 

分 类 号：TG166.5[金属学及工艺—热处理]