退火温度对<strong>TC4</strong>钛合金热轧板材的显微组织、织构和力学性能影响

doi:10.11901/1005.3093.2022.103

材料研究学报

2023, Vol. 37

Issue (1): 70-80 DOI: 10.11901/1005.3093.2022.103

研究论文

本期目录 | 过刊浏览

退火温度对TC4钛合金热轧板材的显微组织、织构和力学性能影响

王伟¹^,²(

), 周山琦¹, 宫鹏辉¹, 张浩泽²^,³, 史亚鸣², 王快社¹

^1.西安建筑科技大学冶金工程学院西安 710055
^2.云南钛业股份有限公司楚雄 651209
^3.昆明理工大学材料科学与工程学院昆明 650093

Effect of Anneal Treatment on Microstructure, Texture and Mechanical Properties of TC4 Alloy Plates

WANG Wei¹^,²(

), ZHOU Shanqi¹, GONG Penghui¹, ZHANG Haoze²^,³, SHI Yaming², WANG Kuaishe¹

^1.School of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
^2.Yunnan Titanium Industry Co., Ltd, Chuxiong 651209, China
^3.School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China

引用本文:

王伟, 周山琦, 宫鹏辉, 张浩泽, 史亚鸣, 王快社. 退火温度对TC4钛合金热轧板材的显微组织、织构和力学性能影响[J]. 材料研究学报, 2023, 37(1): 70-80.
Wei WANG, Shanqi ZHOU, Penghui GONG, Haoze ZHANG, Yaming SHI, Kuaishe WANG. Effect of Anneal Treatment on Microstructure, Texture and Mechanical Properties of TC4 Alloy Plates[J]. Chinese Journal of Materials Research, 2023, 37(1): 70-80.

全文: PDF(9283 KB) HTML

摘要:

对用电子束冷床炉(EB炉)熔炼的TC4钛合金热轧板材进行三火轧制变形，研究了退火温度对其显微组织、织构和力学性能的影响。结果表明：TC4钛合金的原始轧态组织为双态组织，由初生α相和β转变组织构成。退火后等轴α相的含量提高，次生α相的含量降低并趋于球化，组织的等轴化程度提高，在900℃退火后合金的显微组织转变为等轴组织。随着退火温度的提高α相晶粒的偏聚方向发生了变化，织构类型由初始的B型织构转变为B型织构与T型织构的混合织构类型，最终再转变为B型织构。在800℃退火后α晶粒的择优取向最弱，其织构类型为B型织构和T型织构组成的混合织构，较强织构的成分为：φ2=0°截面，{0001}<3 $1 ¯$ $2 ¯$ 0>和{0001}<9 $8 ¯$ $1 ¯$ 0>；φ2=30°截面，{0001}<3 $1 ¯$ $2 ¯$ 0>和{0001}<1 $2 ¯$ 10>。对材料进行室温和高温(400℃)拉伸实验，可得到TC4钛合金强度及塑性与退火温度间的关系：退火温度的提高使合金的抗拉强度提高、屈服强度降低、改善了塑性，合金屈强比的降低使其可靠性提高。

关键词 ：金属材料, TC4钛合金, 织构, 退火, 力学性能, 电子束冷床熔炼

Abstract：

The effect of the anneal temperature on the microstructure, micro-texture and mechanical properties of the hot rolled Ti-6Al-4V alloy were investigated. The results show that the as rolled Ti-6Al-4V alloy presents a bimodal microstructure. The content of equiaxed α-phase increased after annealing. The content of secondary α-phase tented to decrease, whilst to be gradually spheroidized. The microstructure transformed into equiaxed structure after annealing at 900℃. With the increase of anneal temperature, the preferred orientation of α-phase were changed. Correspondingly, the micro-texture changed from B-type to mixed texture, then to B-type again. The crystal directions dispersed when the sample anneal at 800℃. The texture consisted of {0001}<3 $1 ¯$ $2 ¯$ 0>, {0001}<9 $8 ¯$ $1 ¯$ 0>, {0001}<3 $1 ¯$ $2 ¯$ 0> and {0001}<1 $2 ¯$ 10>. The relationship between the mechanical performance and the annealing temperature were assessed via tensile tests. It follows that with the increased of annealing temperature, the tensile strength increased but the yield strength decreased, spontaneously, the ratio of yield strength to tensile strength decreased. In a word, the comprehensive mechanical properties of the alloy may be enhanced through proper annealing process.

Key words： metallic materials TC4 titanium alloy texture annealing mechanical properties electron beam cooling bed smelting

收稿日期: 2022-02-21

ZTFLH:

TG146.2+3

基金资助:国家自然科学基金(51975450)

作者简介: 王伟，男，1985年生，博士

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https://www.cjmr.org/CN/10.11901/1005.3093.2022.103 或 https://www.cjmr.org/CN/Y2023/V37/I1/70

表1 TC4钛合金主要元素含量

图1 TC4钛合金的退火热处理工艺

图2 TC4钛合金的取样示意图

图3 在不同温度退火的TC4钛合金的显微组织

图4 再结晶晶粒的分布

图5 在不同温度退火的TC4钛合金的反极图配色图

图6 α晶粒的取向差分布

图7 在不同温度退火的TC4钛合金的极图

图8 密排六方金属在φ2=0°和φ2=30°ODF截面上重要取向的组分及其位置[36]

图9 在不同温度退火的TC4钛合金的ODF图

图10 退火温度不同的TC4钛合金的室温拉伸性能

表2 GB/T3627-2007规定TC4板材室温力学性能

图11 退火温度不同的TC4钛合金的高温拉伸性能

表3 GB/T3627-2007规定TC4板材高温力学性能

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