Inconel 738Lc/BNi-2/Hastelloy X接头钎焊工艺与性能研究
Research on Brazing Process and Performance of Inconel 738Lc/BNi-2/Hastelloy X Joints
- 2025年55卷第4期 页码:73-80
收稿:2024-04-01,
修回:2024-06-12,
纸质出版:2025-04-20
DOI: 10.7512/j.issn.1001-2303.2025.04.10
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收稿:2024-04-01,
修回:2024-06-12,
纸质出版:2025-04-20
移动端阅览
异种高温合金的钎焊,一直是钎焊领域内的热点。以Inconel 738Lc与Hastelloy X异种高温合金为对象,采用0.3 mm/BNi-2粘带钎料,在真空度1.3×10
-3
Pa条件下进行了不同温度下(1 060~1 140 ℃)的钎焊试验,系统探究了所获钎焊接头的微观组织、元素扩散和断口形貌等。结果表明,接头典型界面微观组织为IN738Lc/γ-Ni+β
1
+Ni-boride+Cr-boride/γ-phase+(Ni,Cr)-B+(Cr,Ni,Fe,Mo) B/Hastelloy X。1 060 ℃时,钎缝中心形成富Cr/Ni硼化物相;当温度升至1 100 ℃,硼化物相完全溶解,形成均匀Ni(s,s)组织,此时接头平均剪切强度达峰值227.62 MPa,较1 060 ℃时提升13.1%,断裂机制表现为IN738Lc母材解理断裂;进一步升高温度至1 140 ℃,B元素在HX晶间扩散深度增至159.2 μm,诱发脆性(Cr,Ni,Fe,Mo)B相沿晶界析出,导致强度下降至189.27 MPa。基于此,确立了1 100 ℃/10 min为最优工艺参数,接头强度达IN738Lc母材室温抗拉强度(247 MPa)的92%,满足燃气轮机蜂窝密封部件长时服役需求。
Brazing of dissimilar high-temperature alloys has always been a hot topic in the field of brazing. Taking Inconel 738Lc and Hastelloy X dissimilar high-temperature alloys as the research object
and using 0.3 mm/BNi-2 tape brazing filler
brazing experiments were conducted under vacuum condition of 1.3×10
-3
Pa at different temperatures (1 060~1 140 ℃). The microstructure
element diffusion
and fracture morphology of the obtained brazing joints were systematically investigated. The results show that the typical interface microstructure of the joint is IN738Lc/γ-Ni +β1+Ni-boride+Cr-boride/γ-phase+(Ni
Cr)-B+(Cr
Ni
Fe
Mo) B/Hastelloy X. At 1 060 ℃
a Cr/Ni-rich boride phase is formed in the center of the brazing seam; when the temperature rises to 1 100 ℃
the boride phase dissolves completely
forming a uniform Ni(s
s) structure
and the average shear strength of the joint reaches its peak value of 227.62 MPa
which is 13.1% higher than that at 1 060 ℃
and the fracture mechanism is characterized by the cleavage fracture of the IN738Lc base material. Further increasing the temperature to 1 140 ℃
the diffusion depth of the B element in the HX grain boundary increases to 159.2 μm
inducing the precipitation of the brittle (Cr
Ni
Fe
Mo)B phase along the g
rain boundary
resulting in a decrease in strength to 189.27 MPa. Based on this
the optimal process parameters are determined to be 1 100 ℃/10 min
and the joint strength reaches 92% of the room temperature tensile strength of the IN738Lc base material (247 MPa)
meeting the long-term service requirements of gas turbine honeycomb sealing components.
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