Naschetnikova Inna A, Stepanov Stepan I, Redikultsev Andrey A, Yarkov Valentin Yu, Zorina Maria A, Lobanov Mikhail L
Heat Treatment & Physics of Metals Department, Ural Federal University, 19 Mira Str., 620002 Ekaterinburg, Russia.
M. N. Miheev Institute of Metal Physics, 18 S. Kovalevskaya Str., 620108 Ekaterinburg, Russia.
Materials (Basel). 2022 Aug 24;15(17):5840. doi: 10.3390/ma15175840.
Crystallographic relationships between α- and β-phases resulting from phase transformations, which took place during the continuous water quenching (WQ), air cooling (AC) and furnace cooling (FC) of a Ti6Al4V plates solution treated at 1065 °C, were investigated by methods of electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). WQ, AC and FC resulted in typical martensite, basket-weave and parallel-plate Widmanstatten structures, respectively. The experimental distribution of α/β-misorientations deviated from BOR at set discrete angles close to 22, 30, 35 and 43°. The experimental spectra of angles were confirmed by theoretical calculations of the possible misorientations between the α and β phases through the β→α→β -transformation path based on Burgers orientation relationship (BOR). Joint analysis of the experimental data and theoretical calculations revealed that the secondary β-phase was precipitated according to the sequence β→α→β during continuous cooling from the single-phase β-region. Similar spectra for α/β-phase misorientations for all investigated cooling rates acknowledged the similar transformation mechanisms and dominant shear component of the phase transformations.
通过电子背散射衍射（EBSD）和透射电子显微镜（TEM）方法，研究了在1065℃固溶处理的Ti6Al4V板材连续水淬（WQ）、空冷（AC）和炉冷（FC）过程中发生的相变所导致的α相和β相之间的晶体学关系。水淬、空冷和炉冷分别产生了典型的马氏体、篮状组织和平行板状魏氏组织。α/β取向差的实验分布在接近22°、30°、35°和43°的设定离散角度处偏离了Burgers取向关系（BOR）。通过基于Burgers取向关系（BOR）的β→α→β转变路径，对α相和β相之间可能的取向差进行理论计算，证实了角度的实验光谱。对实验数据和理论计算的联合分析表明，在从单相β区域连续冷却过程中，次生β相按照β→α→β的顺序析出。所有研究冷却速率下α/β相取向差的相似光谱证实了相变的相似转变机制和主导剪切分量。
