中间层材料Fe和Nb对高强钛-钢复合管界面及剪切强度的影响

doi:10.11900/0412.1961.2022.00387

金属学报

2024, Vol. 60

Issue (1): 117-128 DOI: 10.11900/0412.1961.2022.00387

研究论文

本期目录 | 过刊浏览

中间层材料Fe和Nb对高强钛-钢复合管界面及剪切强度的影响

程磊(

), 张旭航, 韩盈, 程志诚, 余伟

北京科技大学工程技术研究院北京 100083

Effects of Interlayer Materials Fe and Nb on Interfacial Shear Strength of Hot Extruded High-Strength Titanium-Steel Composite Pipe

CHENG Lei(

), ZHANG Xuhang, HAN Ying, CHENG Zhicheng, YU Wei

Institute of Engineering Technology, University of Science and Technology Beijing, Beijing 100083, China

引用本文:

程磊, 张旭航, 韩盈, 程志诚, 余伟. 中间层材料Fe和Nb对高强钛-钢复合管界面及剪切强度的影响[J]. 金属学报, 2024, 60(1): 117-128.
Lei CHENG, Xuhang ZHANG, Ying HAN, Zhicheng CHENG, Wei YU. Effects of Interlayer Materials Fe and Nb on Interfacial Shear Strength of Hot Extruded High-Strength Titanium-Steel Composite Pipe[J]. Acta Metall Sin, 2024, 60(1): 117-128.

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摘要:

开发高强钛-钢复合管对于装备轻量化的研究具有重要意义。本工作采用高温挤压工艺制备以高强CrMo钢和TC11钛合金为基材的钛-钢复合管，研究了中间层材料Fe和Nb对高强钛-钢复合界面反应产物和结合强度的影响，并从界面扩散和组织演变的角度分析其断裂机制。结果表明：Fe中间层挤压态样品能够保持较高的剪切强度(185 MPa)，在热处理过程中，Fe中间层析出的M₂₃C₆及钛基材的再结晶过程，导致界面剪切强度显著下降(70 MPa)；Nb中间层920和970℃挤压态样品分别沿钢-Nb界面和Nb-钛界面断裂，这分别与钢-Nb界面处膜状NbC层的破裂和Nb-钛界面处β-Ti层的不连续特征相关，热处理后扩散修复的NbC层可使920℃挤压样品剪切强度从挤压态的131 MPa提升至170 MPa，而970℃挤压样品界面处不连续的β-Ti层以及Ti_0.86Al_0.11Nb_0.03析出颗粒的回溶，使其界面强度反而下降。综合界面反应和组织转变特征，明确了含2种中间层高强钛-钢复合管的微观断裂机制。

关键词 ：钛-钢复合管, 高温挤压, 中间层, 剪切强度, 析出

Abstract：

The production of metallic composites is an effective way to combine the advantages of different metals. Specifically, the combination of titanium and CrMo steel in a composite pipe can yield good corrosion resistance and excellent abrasion performance, rendering it highly promising for use in the petroleum industry. However, the interfacial reactions between the two metals during the manufacturing process can lead to the precipitation of brittle carbides or intermetallic compounds, resulting in substantial weakening of the combining strength. This is particularly problematic for the TC11 titanium and CrMo steel matrix due to their higher alloy content. Thus, to improve the bonding properties of titanium-steel composites, an interlayer is added between the matrixes. In this study, the effects of interlayer materials (Fe and Nb), extruding temperatures (920 and 970^oC), and heat treatment on the bonding strength of high-strength CrMo steel and TC11 titanium matrixes were investigated. The results revealed that for the titanium-steel composite pipe, the bonding strength of the Fe-titanium interface dominates the shear stress (185 MPa) due to the locking effects of unevenly deformed grains. However, after heat treatment, M₂₃C₆ heavily precipitates in the Fe interlayer causing it to become hard and brittle, weakening the locking effects, and resulting in a significant decrease in shear stress (70 MPa). Conversely, the Nb-interlayer samples extruded at 920^oC mainly cracked along the steel-Nb interface, while those extruded at 970^oC mainly cracked along the Nb-titanium interface. Thus, the two interfaces respectively dominated the shear stress of the two Nb-interlayer samples, and this feature persisted after heat treatment. Moreover, the different cracking routes were found to be caused by the formation of a new NbC layer and a β-titanium layer, respectively. As the fractured NbC layer recovered during the heat treatment, the shear stress of the 920^oC extruded sample increased to 170 MPa and that of the 970^oC extruded sample decreased due to the solution of Ti_0.86Al_0.11Nb_0.03 particles and the discontinuous β-titanium layer induced by it. Thus, the comparative study of interlayer materials and different processing parameters on the interfacial shear stress can effectively improve the production of hot-extruded high-strength titanium-steel pipe.

Key words： titanium-steel composite pipe hot extrusion interlayer shear property precipitation

收稿日期: 2022-08-15

ZTFLH:

TG379

基金资助:国家自然科学基金项目(52201059);中国博士后科学基金项目(2019TQ0028)

通讯作者: 程磊，chenglei@ustb.edu.cn，主要从事高温合金及金属基复合材料的加工工艺及服役行为研究

Corresponding author: CHENG Lei, Tel: (010)62332598, E-mail: chenglei@ustb.edu.cn

作者简介: 程磊，男，1991年生，博士

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图1 挤压坯真空组坯示意图，拉伸剪切样品及压缩剪切样品检测示意图，界面硬度测试示意图，及挤压后含有芯棒的复合管截面与长度特征

图2 Fe中间层在920和970℃挤压后界面特征及合金成分面分布特征

图3 Fe中间层920和970℃挤压态和热处理态的界面元素线分布及挤压样品热处理后的界面形貌

图4 Nb中间层在920和970℃挤压后界面特征及其合金成分面分布特征

图5 Nb中间层920和970℃挤压态、热处理态的界面元素线分布特征及样品热处理后的界面形貌

表1 不同状态的复合界面剪切强度及其断裂特征

图6 920和970℃挤压态和热处理态Fe、Nb中间层的界面硬度

图7 不同合金体系1000℃的三元相图截面特征

图8 Fe中间层样品920和970℃挤压后的组织特征，及Fe中间层970℃挤压态样品热处理后的组织特征和中间层析出特征

图9 Fe和Nb中间层样品经不同挤压温度和热处理后的界面断裂特征

图10 Fe中间层、Nb中间层挤压及热处理态样品的组织及界面特征示意图

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