热处理对高Nb-TiAl合金板材组织及力学性能的影响

doi:10.11901/1005.3093.2014.553

材料研究学报

2015, Vol. 29

Issue (9): 649-655 DOI: 10.11901/1005.3093.2014.553

本期目录 | 过刊浏览

热处理对高Nb-TiAl合金板材组织及力学性能的影响

沈正章,梁永锋,王艳丽,郝国建,张来启,林均品(

)

北京科技大学新金属材料国家重点实验室北京 100083

Effect of Heat Treatment on Microstructure and Mechanical Properties of High Nb-TiAl Alloy Sheet

Zhengzhang SHEN,Yongfeng LIANG,Yanli WANG,Guojian HAO,Laiqi ZHANG,Junpin LIN(

)

State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China

引用本文:

沈正章,梁永锋,王艳丽,郝国建,张来启,林均品. 热处理对高Nb-TiAl合金板材组织及力学性能的影响[J]. 材料研究学报, 2015, 29(9): 649-655.
Zhengzhang SHEN, Yongfeng LIANG, Yanli WANG, Guojian HAO, Laiqi ZHANG, Junpin LIN. Effect of Heat Treatment on Microstructure and Mechanical Properties of High Nb-TiAl Alloy Sheet[J]. Chinese Journal of Materials Research, 2015, 29(9): 649-655.

全文: PDF(10866 KB) HTML

摘要:

研究了不同热处理工艺对高Nb-TiAl合金板材的显微组织及力学性能的影响。采用铸锭原料直接包套热轧制备的板材主要由残余粗化的片层团、再结晶γ晶粒和沿轧制方向带状分布的β相组成。通过不同的热处理工艺可以消除残余片层和β相, 分别获得典型的双态组织、近片层组织和全片层组织。对热处理后具有双态组织的板材进行了室温和高温力学性能测试, 结果表明: 经热处理后, 热轧板材的室温延伸率达到0.5%, 屈服强度和抗拉强度分别提高到646 MPa和691 MPa, 与铸态相比, 其室温强度和塑性得到了改善, 在850-900℃之间材料发生韧脆转变, 并且相应断裂机理从脆性的穿晶断裂转变为孔洞的形核和聚集。

关键词 ：金属材料, 高Nb-TiAl合金, 包套热轧, 热处理, 双态组织, 力学性能

Abstract：

Effect of heat treatment on the microstructure and mechanical properties of a high Nb-containing TiAl alloy sheet was investigated, which was fabricated by directly hot-rolling a packed alloy ingot. The obtained sheet mainly consisted of remnant coarsening lamella, recrystallized γ grains and strip-like β phase along rolling direction. Followed by variant heat treatments, the coarse lamella and β phase were eliminated, and various typical microstructures were appeared, such as duplex, near fully lamellar and fully lamellar ones. Mechanical properties of the sheet with duplex microstructure were tested at room and high temperatures respectively. The results showed that the strength and ductility of the sheet at room temperature were improved after heat treatment. The brittle-ductile transition temperature was in the range of 850-900℃, and the corresponding fracture mode transformed from transgranular fracture to the nucleation and coalescence of voids.

Key words： metallic materials high Nb-TiAl alloy hot-pack rolling heat treatment duplex microstructure mechanical property

收稿日期: 2014-09-30

基金资助:* 国家重点基础研究发展计划2011CB605501资助项目。

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https://www.cjmr.org/CN/10.11901/1005.3093.2014.553 或 https://www.cjmr.org/CN/Y2015/V29/I9/649

表1 高Nb-TiAl合金热轧板材的热处理工艺

图1 高Nb-TiAl基合金的铸态组织

表2 铸态高Nb-TiAl合金EDS成分分析

图2 铸态高Nb-TiAl合金XRD谱

图3 经4道次热轧后板材的显微组织

图4 高Nb-TiAl热轧板材经过HT1热处理后的BSE像

图5 高Nb-TiAl热轧板材经HT2热处理后的BSE像

图6 高Nb-TiAl合金板材分别经过HT3和HT4热处理后的BSE像

图7 铸态和具有双态组织板材的室温拉伸应力—应变曲线

图8 具有双态组织板材的高温拉伸性能

图9 室温拉伸断口形貌

图10 具有双态组织的轧板在不同温度下拉伸断口形貌

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