锻压技术

准β锻造工艺对TC18钛合金组织与性能的影响

英文标题：Influence of quasi β forging on microstructure and mechanical properties of TC18 Ti alloy

作者：黄定辉周俊洪鑫陈瑞钢赵顺峰

单位：无锡透平叶片有限公司

关键词：TC18钛合金跨相区变形准β锻造

分类号：TG113

出版年,卷(期):页码：2014,39(8):125-128

摘要：

研究了准β锻造工艺对TC18钛合金显微组织和性能的影响。结果表明：在α+β两相区较小变形时，其显微组织和仅在β单相区变形时组织形貌相近，为典型的网篮组织；在α+β两相区较大变形时，晶界破碎程度增大，片状α相向等轴状α相转变；随两相区变形量由0～50%变化时，其抗拉强度先升高再降低，在变形量为20%~30%时抗拉强度较高，塑性则呈小幅上升趋势。TC18钛合金跨相区锻造时，为获得编织均匀的网篮组织，且又保证原始β晶界充分破碎，从而获得较优的强度、塑性和冲击韧性的匹配，在β单相区即Tβ+20 ℃温度下的热加工变形中变形量应大于35%，而在α+β两相区即Tβ-30 ℃温度下的热加工变形中变形量应控制在30%以内。

The influence of quasi β forging on microstructure and mechanical properties of TC18 Ti alloy was studied. Results show that the microstructure in (α+β) two-phase zone with smaller deformation degree is close to the one in β monophase zone and is of typical basket weave. In (α+β) two-phase zone with larger deformation degree, the crushed degree of grain boundary increases, and the transformation of α phase from lamellar state to isometrical state occurs. When the deformation degree in two-phase zone varies from 0 to 50%, the tensile strength firstly rises and then drops, and it is higher when deformation degree is within 20%-30%, while the plasticity of TC18 Ti alloy goes up slightly. When forging with stepping over phase zone for TC18 Ti alloy, to obtain homogeneous basket weave and ensure the original β-grain boundary to be sufficiently broken, which brings about better strength, plasticity and impact ductility for TC18 Ti alloy, the deformation degree should be more than 35% during hot-forming in β monophase zone with Tβ+20 ℃and within 30% during hot-forming in (α+β) two-phase zone with Tβ-30 ℃.

基金项目：

黄定辉（1986-），男，硕士，助理工程师

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