热处理对EB铸锭直接轧制TC4合金板材组织和力学性能的影响

doi:10.13251/j.issn.0254-6051.2022.09.013

金属热处理 ›› 2022, Vol. 47 ›› Issue (9): 71-78.DOI: 10.13251/j.issn.0254-6051.2022.09.013

热处理对EB铸锭直接轧制TC4合金板材组织和力学性能的影响

张浩泽^1,2, 王隽生², 宫鹏辉³, 詹海艺², 王凯²

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

收稿日期:2022-05-27 修回日期:2022-07-30 发布日期:2022-10-18
作者简介:张浩泽(1986—),男,博士研究生,主要研究方向为钛合金熔铸及塑性加工,E-mail:317581156@qq.com
基金资助:
云南省重大科技专项(202002AB080001-3)

Effect of heat treatment on microstructure and mechanical properties of TC4 alloy plate directly rolled by EB ingot

Zhang Haoze^1,2, Wang Junsheng², Gong Penghui³, Zhan Haiyi², Wang Kai²

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

Received:2022-05-27 Revised:2022-07-30 Published:2022-10-18

摘要/Abstract

摘要： 对电子束冷床炉熔铸的TC4钛合金扁锭,通过3个火次轧制获得了不同厚度的板材,研究了不同退火温度(750、780、810和850 ℃)对板材显微组织和力学性能的影响。结果表明,一火轧制板材的显微组织破碎不充分,提高退火温度未能明显改变初生α相的形态,二火、三火轧制后原始片层组织逐渐完全破碎,等轴状初生α相比例相应提升,随着退火温度的升高,二火板材初生α相逐渐球化,三火板材初生α相在780 ℃开始逐渐长大,次生α相均呈现出增厚变宽的趋势。综合分析认为,一火板材在810 ℃、二火板材在840 ℃、三火板材在750 ℃退火后,获得了较好的强度和塑性匹配;通过对相应合金板材断口形貌分析,室温断裂机制和高温断裂机制均为典型的韧性断裂。

关键词: TC4钛合金, 轧制火次, 退火温度, 组织演变, 力学性能

Abstract: TC4 titanium alloy ingot cast by electron beam cooling bed furnace were rolled for three times to obtain plates of different thicknesses. The effect of different annealing temperatures (750, 780, 810 and 850 ℃) on microstructure and mechanical properties of the plates was studied. The results show that the microstructure of single reheat rolled sheet is not sufficiently fragmented, and the morphology of primary α phase can't be significantly changed by increasing the annealing temperature. After double reheat rolling and triple reheat rolling, the original lamellar structure is gradually fragmented completely, and the ratio of the primary equiaxed α phase is correspondingly increased. With the increase of annealing temperature, the primary α phase of double reheat rolled plates spheroidizes gradually, and the primary α phase of triple reheat rolled plates begins to grow gradually at 780 ℃, and the secondary α phase shows a tendency of thickening and widening. The comprehensive analysis reveals that after the single reheat rolled plates annealed at 810 ℃, the double reheat rolled plates annealed at 840 ℃, and the triple reheat rolled plates annealed at 750 ℃, a good combination of strength and plasticity is obtained. By analyzing the fracture morphology of the corresponding alloy plates, both the room temperature fracture mechanism and the high temperature fracture mechanism are typical ductile fracture.

Key words: TC4 titanium alloy, rolling times, annealing temperature, microstructure evolution, mechanical properties

中图分类号:

TG156.21

张浩泽, 王隽生, 宫鹏辉, 詹海艺, 王凯. 热处理对EB铸锭直接轧制TC4合金板材组织和力学性能的影响[J]. 金属热处理, 2022, 47(9): 71-78.

Zhang Haoze, Wang Junsheng, Gong Penghui, Zhan Haiyi, Wang Kai. Effect of heat treatment on microstructure and mechanical properties of TC4 alloy plate directly rolled by EB ingot[J]. Heat Treatment of Metals, 2022, 47(9): 71-78.

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热处理对EB铸锭直接轧制TC4合金板材组织和力学性能的影响

Effect of heat treatment on microstructure and mechanical properties of TC4 alloy plate directly rolled by EB ingot

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