热加工工艺对TC20钛合金板材组织和性能的影响
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摘要
本文主要研究了板坯制备工艺、板材轧制工艺和热处理工艺对TC20钛合金板材显微组织和力学性能的影响。显微组织分析表明,在板材制备加工过程中,板坯锻造采用多次镦拔或者板坯轧制采用交叉轧制,成品板材的显微组织主要由等轴初生α相和β转变相组成,组织均匀性良好。否则,成品板材的显微组织会出现条状和等轴初生α相共存的现象,显微组织均匀性变差。采用镦拔板坯+纵横向变形比趋于一致的交叉轧制工艺,热处理制度为(740℃~800℃)/1h,空冷的工艺组合时可以获得由等轴初生α相和β转变相组成的均匀显微组织,组织评级可以满足ETTC2标准中要求的A3~A6级。力学性能分析表明,热加工工艺对室温拉伸力学性能影响不明显,均能满足GB/T13810-2017标准要求。
In this paper,the effects of slab preparation technology,plate rolling process and heat treatment process on microstructure and mechanical properties of TC20 Titanium alloy sheet are studied. The microstructure analysis shows that in the process of plate preparation and processing,the slab forging adopts multiple upsetting or slab rolling using cross rolling,and the microstructure of the finished sheet is mainly composed of the primary alpha phase and the beta transformation phase of the isoaxial,and the uniformity of the tissue is good. Otherwise,the microstructure of the finished sheet will coexist with the primary alpha of the stripe and the isometric,and the uniformity of the microstructure becomes worse. The uniform microstructure composed of the primary alpha phase and the beta transformation phase of the isometric plate can be obtained by using the cross rolling process which tends to be consistent with the upsetting slab + vertical and horizontal deformation ratio,the heat treatment system is(740℃ ~800℃)/1 h,and the organization rating can meet the A3~A6 level required in the ETTC2 standard.The analysis of mechanical properties shows that the thermal processing process has no obvious effect on the tensile mechanical properties of room temperature,and can meet the requirements of GB/T13810-2017 standard.
In this paper,the effects of slab preparation technology,plate rolling process and heat treatment process on microstructure and mechanical properties of TC20 Titanium alloy sheet are studied. The microstructure analysis shows that in the process of plate preparation and processing,the slab forging adopts multiple upsetting or slab rolling using cross rolling,and the microstructure of the finished sheet is mainly composed of the primary alpha phase and the beta transformation phase of the isoaxial,and the uniformity of the tissue is good. Otherwise,the microstructure of the finished sheet will coexist with the primary alpha of the stripe and the isometric,and the uniformity of the microstructure becomes worse. The uniform microstructure composed of the primary alpha phase and the beta transformation phase of the isometric plate can be obtained by using the cross rolling process which tends to be consistent with the upsetting slab + vertical and horizontal deformation ratio,the heat treatment system is(740℃ ~800℃)/1 h,and the organization rating can meet the A3~A6 level required in the ETTC2 standard.The analysis of mechanical properties shows that the thermal processing process has no obvious effect on the tensile mechanical properties of room temperature,and can meet the requirements of GB/T13810-2017 standard.
引文
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