Abstract
1Cr12Mo martensitic stainless steel is widely used for intermediate and low-pressure steam turbine blades in fossil-fuel power plants. A nickel-based filler metal (SFA-5.8 BNi-2) was used to braze 1Cr12Mo in an Ar atmosphere. The influence of brazing temperature and hold time on the joints was studied. Microstructure of the joints brazed, element distribution and shear stress were evaluated at different brazing temperatures, ranging from 1050 °C to 1120 °C, with holding times of 10 s, 30 s, 50 s and 90 s. The results show that brazing joints mainly consist of the matrix of the braze alloy, the precipitation, and the diffusion affected zone. The filler metal elements diffusion is more active with increased brazing temperature and prolonged hold time. The shear strength of the brazed joints is greater than 250 MPa when the brazing temperature is 1080 °C and the hold time is 30 s.
Highlights
Mo to hold the temper brittleness on the base of AISI 403
The filler metal was in powder form with the granule size about evolution and shear strength of the brazed joint are evaluated
Due to the rapid heating and cooling rate in the induction brazing, there is not enough time for the elements to distribute to equilibrium
Summary
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. Fatigue resistance, and corrosion resistance have been researched [1,2,3,4]. Most of these studies are limited to traditional processing technology, such as furnace and vacuum brazing [5]. 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]
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