Microstructure and properties of W-Cu/1Cr18Ni9 steel brazed joint with different Ni-based filler metals
Microstructure and properties of W-Cu/1Cr18Ni9 steel brazed joint with different Ni-based filler metals
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DOI：
10.1515/secm-2016-0172
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发表时间：
2018-05-01
影响因子：
1.9
通讯作者：
Zou, Jiasheng
中科院分区：
文献类型：
--
作者：
Zhou, Yi;Xia, Chunzhi;Zou, Jiasheng
采用 NiCrSiBFeTi 和 NiMnSiCuZr 钎料在真空炉中对 W-Cu 合金和 1Cr18Ni9 钢进行钎焊。 NiCrSiBFeTi钎缝区的主要显微组织是W、Cu、Cr、Fe固溶在Ni相中的Ni基固溶体以及金属间化合物CrB和TiCr2。 NiMnSiCuZr钎缝区的主要显微组织为Ni相中固溶的Cu、Cr、Fe的Ni基固溶体以及Fe相中固溶的Ni、Cu、Cr的Fe基固溶体以及金属间化合物Mn-5 Si-3、Ni-3 Si、Ni-7 Zr-2。与1Cr18Ni9钢相比，NiCrSiBFeTi钎料中的Ni、Si、Ti元素和NiMnSiCuZr钎料中的Ni、Mn、Si元素更容易扩散到W-Cu合金界面中。 NiCrSiBFeTi接头和NiMnSiCuZr接头的剪切强度值分别约为285和249 MPa，两种接头的断裂发生在靠近W-Cu合金侧的界面处。前者断口形貌鉴定为解理脆性断裂，后者鉴定为沿晶脆性断裂。
W-Cu alloy and 1Cr18Ni9 steel were brazed with NiCrSiBFeTi and NiMnSiCuZr filler metals in a vacuum furnace. The main microstructure of the NiCrSiBFeTi brazing seam region was a Ni-based solid solution of W, Cu, Cr, and Fe dissolved in the Ni phase and intermetallic compounds CrB and TiCr2. The main microstructure of the NiMnSiCuZr brazing seam region was a Ni-based solid solution of Cu, Cr, and Fe dissolved in the Ni phase Fe-based solid solution of Ni, Cu, and Cr dissolved in the Fe phase and intermetallic compounds Mn-5 Si-3, Ni-3 Si, and Ni-7 Zr-2. The elements Ni, Si, and Ti contained in the NiCrSiBFeTi filler metal and the elements Ni, Mn, and Si contained in the NiMnSiCuZr filler metal were more easily diffused into the interface of W-Cu alloy compared with that of 1Cr18Ni9 steel. The shear strength values of NiCrSiBFeTi joint and NiMnSiCuZr joint were approximately 285 and 249 MPa, respectively, and fracture of the two joints occurred at the interface near the W-Cu alloy side. The fracture morphology of the former was identified as cleavage brittle fracture, and the latter was identified as intergranular brittle fracture.