Sun Lili, Li Ze, Gao Sheng, Li Yongcun
School of Mechanical Science and Engineering, Northeast Petroleum University, 199 Fazhan Road, Daqing 163318, PR China.
Heilongjiang Key Laboratory of Petroleum and Petrochemical Multiphase Treatment and Pollution Prevention, 199 Fazhan Road, Daqing 163318, PR China.
ACS Appl Mater Interfaces. 2024 Sep 25;16(38):51649-51659. doi: 10.1021/acsami.4c09965. Epub 2024 Sep 12.
In this study, a 304 stainless steel (304 SS)/20 carbon steel (20 CS) bimetal was prepared by vacuum diffusion bonding, with 20 CS as the substrate and 304 SS as the cladding layer, and the interfacial microstructure and bonding strength before and after solution treatment were studied. The 304 SS and The 20 CS formed a strong metallurgical bond after being held at 1380 °C for 60 min without defects such as unbonded regions. Diffusion of Cr and Ni atoms from the 304 SS to the 20 CS occurred, and the C atoms diffused from the 20 CS to the 304 SS, forming a carburized region. A pearlitic region with an average width of approximately 20 μm was formed on the 20 CS side. After solution treatment, austenitization was formed in the carburized region, which was accompanied by the formation of twin crystals. The interfacial bonding strength of the bimetal was measured to be 485 MPa, which increased to 547 MPa after the solution treatment.
在本研究中，通过真空扩散连接制备了以20碳钢（20CS）为基体、304不锈钢（304SS）为覆层的304不锈钢/20碳钢双金属，并研究了固溶处理前后的界面微观结构和结合强度。304SS和20CS在1380℃保温60min后形成了牢固的冶金结合，无未结合区域等缺陷。Cr和Ni原子从304SS扩散到20CS，C原子从20CS扩散到304SS，形成了渗碳区。在20CS一侧形成了平均宽度约为20μm的珠光体区域。固溶处理后，渗碳区发生奥氏体化，并伴随孪晶的形成。双金属的界面结合强度测得为485MPa，固溶处理后增加到547MPa。
