α+β两相区改锻火次对Ti65合金棒材的组织和力学性能影响  

Effect of Forging Times in α+β Phase Zone on Microstructureand Mechanical Properties of Ti65 Alloy Bar

作　　者：邓雨亭 王旭 刘晶南 刘英飒 DENG Yuting;WANG Xu;LIU Jingnan;LIU Yingsa

机构地区：[1]中国航发北京航空材料研究院先进钛合金航空科技重点试验室,北京100095

出　　处：《大型铸锻件》2025年第1期8-12,共5页Heavy Casting and Forging

基　　金：国家科技重大专项(J2019-VI-0012-0126)。

摘　　要：采用光学显微镜和电子背散射衍射(EBSD)等研究了α+β两相区改锻火次对Ti65合金棒材显微组织的影响规律,并针对不同火次棒材进行了拉伸性能、持久性能和超声检测的性能测试。研究和检测结果表明:在β相区变形量一定的前提下,两相区改锻变形3火后α片层破碎不充分;5火后α片层基本弯曲破碎;10火后边缘到心部α相均等轴化并呈现均匀分布,β晶粒尺寸呈逐步递减的趋势。不同位置均不存在取向一致的宏区,属理想显微组织类型。改锻火次的增加显著提升了棒材的显微组织和晶粒度的均匀性,从而改善了超声检测水平。从3火至5火后棒材拉伸塑性和持久性能显著提升,10火后无明显变化,继续变形对拉伸和持久力学性能的改善变得不明显。The optical microscope and electron backscattered diffraction techniques were employed to investigate the influence of forging times inα+βphase zone on microstructure of Ti65 alloy bar.The tensile properties,stress rupture properties and ultrasonic inspection of the bars with different forging times were tested.The research and inspection results show that under the condition of definite amount of deformation inβphase zone,after three times of heating after deformation,theαlamella layer is not broken sufficiently;after five times of heating,theαlamella layer is basically bent and broken;after ten times of heating,theαphase from the edge to the center is equally equiaxed and evenly distributed,and theβgrain size shows a gradually decreasing trend.In different positions,there is no macro zone with the same orientation,which is an ideal microstructure type.The increase of the forging times significantly improves the uniformity of microstructure and grain size of the bar,thus improving the level of ultrasonic test.The tensile plasticity and stress rupture performance of the bar were significantly improved from three to five times,but there was no significant change after ten times,and the improvement of properties became unapparent after continuous deformation.

关 键 词：Ti65合金 改锻火次 显微组织 力学性能 

分 类 号：TG131[一般工业技术—材料科学与工程]