**1. Introduction**

1Cr12Mo stainless steel is a modified material made by appropriately increasing the content of Mo to hold the temper brittleness on the base of AISI 403. As a martensitic heat-resistant stainless steel with good creep strength and moderate corrosion resistance, 1Cr12Mo stainless steel is widely used for intermediate and low-pressure steam turbine blades in fossil-fuel power plants. Its mechanical properties, fatigue resistance, and corrosion resistance have been researched [1–4]. However, most of these studies are limited to traditional processing technology, such as furnace and vacuum brazing [5]. Compared with vacuum brazing, induction brazing is a faster and more effective technique, which provides a fast and controllable method of heating to help elements dissolution, diffusion, and chemical reaction between the base metal and the filler metal. The heating rate of induction brazing can reach 100 ◦C/s, which is important to avoid liquation of the braze alloy with different solidus and liquidus temperatures [6].

For excellent performance of the brazed joint, nickel-based filler metal is often used in high-temperature alloy induction brazing. B, Si, and other elements are added to the filler metal to lower its melting point temperature and improve its liquid flow rate. However, B and Si in the filler metal can react with some metallic elements and form high hardness brittle intermetallic compounds, usually located in the diffusion affected zone of the welded joints. These intermetallic compounds have adverse effects on joint performance. The brazing temperature and hold time at high temperature have a critical influence on the diffusion of B and Si. Proper brazing temperature and hold time are helpful to the diffusion of B and Si, and the diffusion between the filler metal and the base metal [7]. Compared with BMn50NiCuCrCo and BNi82CrSiBFe filler metals, SFA-5.8 BNi-2 filler metal is the

best for stainless steel brazing because of its distinct weldability [8]. In this study, induction brazing of 1Cr12Mo using a nickel-based brazing alloy, BNi-2, was investigated. Both the microstructural evolution and shear strength of the brazed joint are evaluated.
