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Article

Diffusion Bonding of 9Cr Martensitic/Ferritic Heat-Resistant Steels with an Electrodeposited Ni Interlayer

State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300354, China
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Metals 2018, 8(12), 1012; https://doi.org/10.3390/met8121012
Received: 3 November 2018 / Revised: 21 November 2018 / Accepted: 30 November 2018 / Published: 2 December 2018
In this paper, diffusion bonding was adopted to join 9Cr martensitic/ferritic heat-resistant steels using an electrodeposited Ni interlayer with a thickness of 40 μm. In addition, the effect of tempering treatment after diffusion bonding on the microstructure evolution and mechanical properties of the bonding joints was investigated. It was found that a transition region with face-centered cubic (FCC) structure was formed between the steel and Ni interlayer. The transition region was the solid solution of (γFe,Ni) rich in Ni component, being related to martensite in the base metal by the Kurdjumov–Sachs (K-S) orientation relationship. No intermetallic compounds were detected at the bonding joints before and after tempering treatment. After tempering treatment, the transition region had higher dislocation density than other regions, due to the higher pinning effect of solute atoms acting on the dislocation than that of the matrix. Tensile tests indicated that tempering treatment improved the mechanical properties of the joint, since the samples after tempering treatment fractured in the base metal, whereas the specimens without tempering treatment fractured at the joint interface. View Full-Text
Keywords: diffusion bonding; 9Cr martensitic/ferritic heat-resistant steel; electrodeposited Ni; tempering treatment diffusion bonding; 9Cr martensitic/ferritic heat-resistant steel; electrodeposited Ni; tempering treatment
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MDPI and ACS Style

Gao, Y.; Wang, Z.; Liu, Y.; Li, W.; Liu, C.; Li, H. Diffusion Bonding of 9Cr Martensitic/Ferritic Heat-Resistant Steels with an Electrodeposited Ni Interlayer. Metals 2018, 8, 1012. https://doi.org/10.3390/met8121012

AMA Style

Gao Y, Wang Z, Liu Y, Li W, Liu C, Li H. Diffusion Bonding of 9Cr Martensitic/Ferritic Heat-Resistant Steels with an Electrodeposited Ni Interlayer. Metals. 2018; 8(12):1012. https://doi.org/10.3390/met8121012

Chicago/Turabian Style

Gao, Yan, Zumin Wang, Yongchang Liu, Wenchao Li, Chenxi Liu, and Huijun Li. 2018. "Diffusion Bonding of 9Cr Martensitic/Ferritic Heat-Resistant Steels with an Electrodeposited Ni Interlayer" Metals 8, no. 12: 1012. https://doi.org/10.3390/met8121012

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