中温热处理对<strong>Ti65</strong>合金淬火组织及室温拉伸性能的影响

doi:10.11901/1005.3093.2022.661

材料研究学报

2023, Vol. 37

Issue (12): 881-888 DOI: 10.11901/1005.3093.2022.661

研究论文

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中温热处理对Ti65合金淬火组织及室温拉伸性能的影响

谭海兵¹^,², 臧健¹^,², 梁弼宁¹^,², 刘建荣¹(

), 王清江¹(

), 赵子博¹, 李文渊¹

^1.中国科学院金属研究所师昌绪先进材料创新中心沈阳 10016
^2.中国科学技术大学材料科学与工程学院沈阳 10016

Effect of Medium Heat Treatment on Quenched Micro-structure and Tensile Properties of Ti65 Alloy

TAN Haibing¹^,², ZANG Jian¹^,², LIANG Bining¹^,², LIU Jianrong¹(

), WANG Qingjiang¹(

), ZHAO Zibo¹, LI Wenyuan¹

^1.Shi -changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^2.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China

引用本文:

谭海兵, 臧健, 梁弼宁, 刘建荣, 王清江, 赵子博, 李文渊. 中温热处理对Ti65合金淬火组织及室温拉伸性能的影响[J]. 材料研究学报, 2023, 37(12): 881-888.
Haibing TAN, Jian ZANG, Bining LIANG, Jianrong LIU, Qingjiang WANG, Zibo ZHAO, Wenyuan LI. Effect of Medium Heat Treatment on Quenched Micro-structure and Tensile Properties of Ti65 Alloy[J]. Chinese Journal of Materials Research, 2023, 37(12): 881-888.

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摘要:

研究了中温热处理后Ti65合金中淬火马氏体相的分解及其对室温拉伸性能的影响。结果表明：在800℃/10 min热处理后Ti65合金中淬火马氏体相(α'相)内的β稳定元素向界面扩散，分解为α+β相；随着保温时间的延长，β相的形貌由不规则状转变为不同长宽比的棒状。热处理温度的提高，分解产物显著粗化。随着中温热处理温度升高或保温时间的延长，室温拉伸强度呈现快速降低、保持稳定和慢速降低三个阶段。强度快速降低的原因是，马氏体相分解使缺陷和界面密度降低，导致固溶和界面强化效果减弱；马氏体相完全分解后，α板条粗化导致的强度降低和α₂相弥散度的提高使强度提高，其综合作用使强度保持相对稳定；中温热处理温度提高到α₂相析出温度以上时，强度随着α板条厚度的增加缓慢降低。

关键词 ：金属材料, Ti65合金, 中温热处理, 马氏体相分解, 拉伸性能

Abstract：

Heat treatments in the temperature range of 800~950℃for 10~60 min was applied to water-quenched Ti65 alloy, in order to investigate the martensite decomposition and its effect on tensile properties at room temperature. The results show that detectable martensite decomposition is already found at 800℃ with a holding time of only 10 min. The martensite decomposition occurs through the diffusion of β-stabilizing elements from the interior of α' plate to the interface to form β phase. The morphology of the β phase changes from irregular to regular rods of varied aspect ratio with prolonged holding time. Increasing temperature leads to apparent coarsening of the decomposition products. Both room-temperature tensile and yield strengths decrease after the heat treatments. Nearly constant strength was found for the heat treatments in the range from 800℃/40 min across 850℃ 20 min/40 min/60 min to 900℃/20 min. The decrease of strength is attributed mainly to the weakened solution strengthening induced by the decomposition of martensite phase. After the completion of the decomposition of the martensite phase, the strength remains almost constant due to the balance between the weakening induced by the coarsening of α plate and the strengthening by the dispersed α₂ particles.

Key words： metallic materials Ti65 alloy medium-temperature heat treatment martensite decomposition tensile property

收稿日期: 2022-12-12

ZTFLH:

TG132.32

基金资助:国家科技重大专项(J2019-VI-0012-0126)

通讯作者: 王清江，研究员，qjwang@imr.ac.cn，研究方向为钛合金研发及工程应用;
刘建荣，研究员，jrliu@imr.ac.cn，研究方向为钛合金研发及工程应用

Corresponding author: WANG Qingjiang, Tel: (024)83978830, E-mail: qjwang@imr.ac.cn;
LIU Jianrong, Tel: (024)23971942, E-mail: jrliu@imr.ac.cn

作者简介: 谭海兵，男，1986年生，博士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2022.661 或 https://www.cjmr.org/CN/Y2023/V37/I12/881

图1 不同条件中温热处理后Ti65合金的显微组织

表1 马氏体分解样品的热处理制度

表2 拉伸性能样品的热处理制度

图2 不同条件中温热处理后Ti65合金中α相变板条的宽度

图3 800℃中温热处理后Ti65合金的XRD谱

图4 不同条件中温热处理后Ti65合金的室温拉伸性能

图5 Ti65合金马氏体分解过程中β相的演化示意图

图6 中温热处理后Ti65合金中α2相形貌的变化

图7 拉伸性能与α相板条厚度的关系

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