退火温度对EB熔炼低成本TC4钛合金宽厚板组织和性能的影响

doi:10.13251/j.issn.0254-6051.2020.10.015

摘要/Abstract

摘要： 采用EB炉一次熔炼TC4合金扁锭作为直轧坯料,在4200 mm宽厚板轧机上成功制备出规格46 mm×2650 mm×8700 mm的低成本TC4合金宽厚板,研究了退火温度对低成本TC4合金板材显微组织和力学性能的影响。结果表明:EB熔炼TC4合金扁锭经过两火换向轧制,粗大铸态组织得到充分破碎,热轧态TC4合金板材显微组织中等轴α或条状α含量较高,横纵向室温拉伸性能差异小,横向室温冲击吸收能量小于纵向,横纵向心部强度均高于表层。TC4合金板材经750~900 ℃退火,横纵截面为等轴组织,经950 ℃退火,横纵截面为双态组织,经980 ℃退火,横截面为双态组织,纵截面为魏氏组织。随着退火温度升高,TC4合金板材抗拉强度和规定塑性延伸强度呈下降趋势,伸长率基本不变,室温冲击吸收能量先升高后降低,900 ℃退火后,强度、伸长率和冲击吸收能量达到最佳匹配。

关键词: TC4钛合金, 退火温度, 低成本, 宽厚板, 显微组织, 力学性能

Abstract: TC4 alloy slab ingot was used as a direct-rolled billet in the EB furnace at one time. A low cost TC4 alloy wide plate with a size of 46 mm×2650 mm×8700 mm was successfully prepared on a 4200 mm wide and thick plate mill, the effect of annealing temperature on the microstructure and mechanical properties of the low cost TC4 alloy plate was studied. The results show that the EB smelted TC4 alloy slab is subjected to dual reversing rolling, and the coarse as-cast microstructure is broken. The microstructure of the hot-rolled TC4 alloy plate has a high content of equiaxed α-phase or strip α-phase, small transverse and longitudinal room temperature tensile properties differences, and the transverse room temperature impact absorbed energy is less than the longitudinal direction, and the strength of the core part is higher than the surface layer. When annealed at 750-900 ℃, the transverse and longitudinal section of the TC4 alloy sheet are equiaxed structure, when annealed at 950 ℃, the transverse and longitudinal section are dual-state structure, when over 980 ℃, the cross-section is dual-state structure, and the longitudinal section is widmanstatten structure. As the annealing temperature increases, the tensile strength and the proof strength plastic extension of TC4 alloy sheet show a downward trend, and the elongation is basically unchanged. The impact absorbed energy at room temperature first increases and then decreases. After annealing at 900 ℃, the strength, elongation and impact absorbed energy achieve the best match.

Key words: TC4 titanium alloy, annealing temperature, low cost, wide and thick plate, microstructure, mechanical properties

中图分类号:

TG146.2⁺3

张强, 李渤渤, 裴腾, 郝晓博, 刘茵琪. 退火温度对EB熔炼低成本TC4钛合金宽厚板组织和性能的影响[J]. 金属热处理, 2020, 45(10): 73-78.

Zhang Qiang, Li Bobo, Pei Teng, Hao Xiaobo, Liu Yinqi. Effect of annealing temperature on microstructure and properties of EB melted low cost TC4 titanium alloy wide and thick plate[J]. Heat Treatment of Metals, 2020, 45(10): 73-78.

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