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| 温度对SUS410/BNi-2/Hastelloy X钎焊接头界面组织及力学性能的影响 |
| Effect of Brazing Temperature on Microstructure and Mechanical Property of SUS410/ BNi-2/ Hastelloy X Joint |
| Received:July 30, 2024 |
| DOI：10.3969/j.issn.1674-6457.2024.10.012 |
| 中文关键词: SUS410 Hastelloy X 真空钎焊 界面组织 力学性能 |
| 英文关键词: SUS410 Hastelloy X vacuum brazing microstructure mechanical property |
| 基金项目:国家自然科学基金(52475330);山东省自然科学基金(ZR2023JQ021) |
| Author Name | Affiliation | | FU Wei | School of Materials Science and Engineering, Harbin Institute of Technology Weihai, Shandong Weihai 264209, China | | SUN Hao | School of Materials Science and Engineering, Harbin Institute of Technology Weihai, Shandong Weihai 264209, China | | CHEN Xingdong | Dongfang Turbine Co., Ltd., Sichuan Deyang 618000, China | | SONG Xiaoguo | School of Materials Science and Engineering, Harbin Institute of Technology Weihai, Shandong Weihai 264209, China | | HU Shengpeng | School of Materials Science and Engineering, Harbin Institute of Technology Weihai, Shandong Weihai 264209, China |
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| 中文摘要: |
| 目的 针对汽封部件的高质量制造需求，系统研究了温度对SUS410/BNi-2/Hastelloy X钎焊接头微观组织及力学性能的影响。方法 将以SUS410/BNi-2/Hastelloy X搭接结构装配的试样放入真空炉中在不同温度(1 060~1 140 ℃)下进行钎焊连接，利用SEM和EDS等手段分析钎料与母材之间的相互作用，测试接头的力学性能并分析接头断裂行为，研究温度对接头界面组织演化和力学性能的影响。结果 钎缝主要由Ni(s,s)与Cr-B相组成，B元素扩散进入两侧母材，在晶界处聚集形成硼化物相。随着钎焊温度的升高，钎缝中富Cr的硼化物和浅灰色Ni(s,s)相消失，形成均匀的Ni(s,s)组织，两侧母材中B元素扩散深度增加。随着钎焊温度不断升高，钎焊接头的抗剪强度逐渐上升，上升到某一强度后，温度继续升高，但强度反而下降，断裂位置由钎缝中心先转移至Hastelloy X基体，随着温度继续升高，断裂位置又转移至SUS410扩散区。断裂形式由脆性断裂转变为韧性断裂。结论 采用BNi-2黏带钎料实现了SUS410与Hastelloy X合金的可靠连接，接头典型界面组织为SUS410/扩散区((Fe,Cr)+(Fe,Cr)-B)/钎缝区(Ni(s,s)+Cr-B+β1-phases)/扩散区(γ-phase+(Cr,Ni)-B+(Cr, Ni, Mo)-B)/Hastelloy X;钎焊接头的最大抗剪强度为235.6 MPa(1 100 ℃)。 |
| 英文摘要: |
| The work aims to study the effect of temperature on microstructure and mechanical properties of SUS410/BNi-2/ Hastelloy X joints based on the high quality manufacturing requirement of gland sealing components. The specimens assembled with a SUS410/BNi-2/Hastelloy X lap joint structure were subject to brazing at varying temperature (1 060-1 140 ℃) within a vacuum furnace. The interaction between the brazing material and the base material was then analyzed using SEM and EDS. The mechanical properties of the joints were subsequently tested, and the joints were analyzed for their fracture behavior. Finally, the effect of temperature on the interface microstructural evolution and mechanical properties of the joints was investigated. It was determined that the braze joint was primarily composed of Ni(s,s) and Cr-B phases, with the B element diffusing into the base material on both sides and aggregating at the grain boundary to form boride phases. As the brazing temperature increased, the Cr-rich boride and light grey Ni(s,s) phases in the brazing seam disappeared, resulting in the formation of uniform Ni(s,s). Concurrently, the depth of B element diffusion in the base material on both sides increased. As the brazing temperature increased, the shear strength of the brazed joints gradually rose to a certain maximum value. However, if the temperature further increased, the strength instead decreased. This was accompanied by a transfer of the fracture location from the brazing center to the Hastelloy X matrix. If the temperature rose, the fracture location was transferred to the SUS410 diffusion zone. The fracture form shifted from brittle to toughness fracture. In conclusion, the use of BNi-2 tape brazing material results in the formation of a reliable joint between the SUS410 and Hastelloy X alloys. The typical interfacial organization of the joint is as follows:SUS410/diffusion zone (Fe,Cr)+(Fe,Cr)-B/brazing zone (Ni(s,s))+Cr-B+β1-phases/diffusion zone (γ-phase)+(Cr,Ni)-B+ (Cr,Ni,Mo)-B/Hastelloy X. The maximum shear strength of the brazed joint is 235.6 MPa (1 100 ℃). |
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