论文部分内容阅读
研究了Ti-22Al-25Nb合金环形件的制备工艺和组织性能关系。结果表明:Ti-22Al-25Nb合金增加棒材改锻的次数可提高组织均匀性,细化晶粒,从而显著提高合金的室温塑性。对棒材在α2+B2+O三相区(970℃)和α2+B2两相区(1050℃)轧制可分别获得双态组织和板条组织的环形件。两种组织的室温抗拉强度均在1100 MPa以上,室温伸长率在6.5%以上。两种组织相比,双态组织具有更高的强度,而板条组织的塑性更好。根据试验结果,Ti-22Al-25Nb合金在生产应用时,棒材的锻造镦拔次数应不低于8次,环形件轧制应选择在α2+B2两相区(1050℃)。
The relationship between the preparation process and microstructure and properties of Ti-22Al-25Nb alloy was studied. The results show that increasing the number of times of bar forging modification can improve the homogeneity of microstructure and grain refinement of Ti-22Al-25Nb alloy, thereby significantly improving the room-temperature plasticity of the alloy. The rings of bimodal and laths were obtained by rolling the bars at the α2 + B2 + O three-phase region (970 ° C) and the α2 + B2 two-phase region (1050 ° C) respectively. Tensile strength of the two organizations are above 1100 MPa, room temperature elongation of 6.5% or more. Compared with the two kinds of organizations, the bimodal organization has a higher strength, while the lath tissue plasticity better. According to the test results, when the Ti-22Al-25Nb alloy is used in production and application, the number of times of forging forging of the bar should not be less than 8 times, and the ring rolling should be selected in the α2 + B2 two-phase region (1050 ℃).