Filler wire for fusion welding of low-activation martensitic steel and its use method

Abstract

The invention belongs to the field of new welding materials, in particular to a filler wire for fusion welding of low-activation martensitic steel and its use method, which is mainly used for the new structure material of fusion reactor——China Low Activation Martensitic Steel (CLAM) structure welding, characterized in that: the composition of the welding wire is calculated according to the mass percentage: P≤0.003%; S≤0.003%, C≤0.12%, Cr9~12%, W1.2~2.5%, Ta0.3~0.8% , Mn0.3~0.5%, Y0.2~0.6%, and the balance is Fe. Using the welding wire described in the present invention: applied to CLAM steel TIG welding, can inhibit the grain growth of the weld seam, and reduce or eliminate the massive δ ferrite in the weld seam, thereby improving the mechanical properties and high temperature resistance of the weld seam , corrosion resistance, anti-radiation swelling and other properties.

Description

technical field [0001] The invention belongs to the field of new welding materials, in particular to a filler wire for fusion welding of low-activation martensitic steel, which is mainly used for a new structural material of fusion reactor——China Low Activation Martensitic (CLAM) structure of welding. Background technique [0002] Nuclear fusion energy is a kind of "clean" energy, which is considered as a potential technology to meet the future energy needs of mankind. Fusion reactor structure materials generally use low-activation ferritic / martensitic steel (Reduced Activation Ferritic / Martensitic, RAFM). Achieve the effect of low activation and ensure that fusion energy is clean energy; China has developed a low-activation ferrite / martensitic steel with Chinese independent intellectual property rights, optimized composition and performance-Chinese low-activity martensitic steel, namely CLAM Steel (China Low Activation Martensitic) is generally considered to be the The ...

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Problems solved by technology

[0003] Welding technology and process is one of the key issues related to whether CLAM steel can be applied in practice. Scholars at home and abroad have done a lot of research on the welding of fusion reactor structural materials, and tried a variety of welding methods, such as hot isostatic pressing (HIP welding) ), electron beam welding (EBW), laser welding (LBW), tungsten argon arc welding (TIG), etc., but there are some problems in the weldment, mainly in: (1) The grains in the weld are seriously coarse, Its size is about 20 times that of the base metal grain, which restricts the improvement of the mechanical properties of the welded joint; (2) Many massive δ ferrites are prone to appear in the weld structure. According to J. Onoro's research, it is found that the massive δ iron The generation of ferrite not only weakens the strength and hardness of the weld, but also increases the tendency of crystal cracks, promotes the precipitation of θ phase, and reduces the high temperature creep toughness, thus seriously affecting the high temperature resistance and radiation swelling resistance of the weld; in addition Hot isostatic pressure diffusion welding is easy to form a stable oxide layer on the contact surface of the joint, which is difficult to eliminate through high temperature diffusion during the welding process, which affects the impact performance of the joint

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