316L不锈钢/T2紫铜热等静压扩散连接接头的微观组织与力学性能

麻相龙; 曹睿; 董浩; 王彩芹; 张龙戈; 闫英杰

doi:10.12073/j.hjxb.20220522002

316L不锈钢/T2紫铜热等静压扩散连接接头的微观组织与力学性能

1.
兰州理工大学, 有色金属先进加工与再利用省部共建国家重点实验室, 兰州, 730050
2.
中国钢研科技集团有限公司安泰科技股份有限公司, 北京, 100081

基金项目: 国家自然科学基金资助项目(52175325，51961024)

详细信息

作者简介:
麻相龙，博士研究生；主要研究方向异种金属连接；Email: 3498915896@qq.com

通讯作者:
曹睿，博士，教授，博士研究生导师；Email: caorui@lut.edu.cn

中图分类号: TG 457.1
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出版历程
- 收稿日期: 2022-05-07
- 网络出版日期: 2023-04-13
- 刊出日期: 2023-04-24

Microstructure and mechanical properties of 316L stainless steel/T2 copper hot isostatic bonding joint

1.
State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou, 730050, China
2.
China Iron & Steel Research Technology Co., Ltd., Advanced Technology & Materials Co., Ltd., Beijing, 100081, China

摘要

摘要: 采用热等静压(hot isostatic pressing，HIP)工艺对棒材316L不锈钢/T2紫铜进行连接，分析连接界面微观组织和力学性能.结果表明，在塑性变形和扩散反应的连接机制下，异种金属连接接头结合良好，两侧基体元素发生了明显的互扩散，最终形成了3.9 μm厚的扩散层，扩散层分为两侧的扩散影响区(diffusion affected zone，DAZ)和中间反应层(reaction layer，RL)，扩散层及其附近的T2紫铜侧有树枝状的γ-Fe相、条状α(Cu, Ni)相和不规则块状富Cr相析出. 硬度试验结果表明，连接接头硬度要高于较弱T2紫铜母材，接头平均硬度为94 HV0.1，未出现硬度突变的现象，表明接头没有脆性金属间化合物生成，拉伸试验最终在T2紫铜母材断裂，断裂机制为韧性断裂，最大抗拉强度为165 MPa，接头及其附近析出相的弥散分布形成了第二相强化机制，阻碍位错的运动，最终使得连接接头具有较高的硬度和较好的结合强度.
- 热等静压扩散连接 /
- 微观组织 /
- 异种金属 /
- 力学性能
Abstract: Hot isostatic pressing (HIP) was used to bond the bar 316L stainless steel/T2 copper, and the microstructure and mechanical properties of the bonding interface were analyzed. The results show that the dissimilar metal joints are well bonded under the bonding mechanism of plastic deformation and diffusion reaction, and the elements on both sides of the matrix obviously have mutual diffusion. Finally, the diffusion layer with a thickness of 3.9 μm is formed. The diffusion layer is divided into the diffusion-affected zone (DAZ) on both sides and the reaction layer (RL) in the middle. Dendritic γ-Fe phase, strip α (Cu, Ni) phase, and irregular massive Cr-rich phase precipitate on the diffusion layer and adjacent side of T2 copper. Hardness test results show that the hardness of the joint is higher than that of the weak T2 base metal. The average hardness of the joint is 94 HV0.1, and there is no hardness mutation, which that indicates no brittle intermetallic compound was formed. A ductile fracture happened at the T2 base metal during the tensile test, with the maximum tensile strength of 165 MPa. Joints and their adjacent diffuse distribution of the precipitated phase formed a second phase strengthening mechanism, which has hindered the dislocation movement, and thus enabled the joint with better hardness and bonding strength.
- hot isostatic bonding /
- microstructure /
- dissimilar metal /
- mechanical properties

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图 1 钢/铜热等静压扩散连接示意图

Figure 1. Schematic diagram of steel/copper HIP diffusion bonding

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图 2 钢/铜连接接头宏观形貌

Figure 2. Macro-morphology of the steel/copper joints

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图 3 316L不锈钢的微观组织

Figure 3. Microstructure of the 316L stainless steel

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图 4 T2紫铜的微观组织

Figure 4. Microstructure of the T2 copper

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图 5 接头微观形貌及其附近析出相

Figure 5. Micro morphology of joint and precipitated phase near the joint. (a) BEM picture; (b) diffusion zone; (c) micro morphology of joint; (d) T2 region near the joint

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图 6 图5b接头扩散区线扫描结果

Figure 6. Line scanning results of joint diffusion zone in Fig.5b

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图 7 接头附近显微维氏硬度分布

Figure 7. Vickers microhardness distribution near the joint

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图 8 接头的抗拉强度和断后伸长率

Figure 8. Tensile strength and elongation of joint

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图 9 拉伸试样的断口形貌

Figure 9. Fracture morphology of the tensile specimen

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表 1 T2紫铜和316L不锈钢的化学成分(质量分数，%)

Table 1 Chemical compositions of the T2 copper and 316L stainless steel

材料 Fe Cu C Cr Ni Mn Mo Pb

T2 0.005 余量 — — — — — 0.005
316L 余量 — 0.03 16.07 12.01 2.00 2.21 —

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表 2 图5a中点扫描的结果(质量分数, %)

Table 2 Results of point scanning in Fig. 5a

位置 Fe Cr Cu Ni 可能的析出相

1 21.4 3.1 72.7 2.8 α(Cu, Ni)相
2 22.8 4.4 70.2 2.6 γ-Fe相
3 30 59.2
5.2 — 富Cr析出相

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