Thermal aging effects on mechanical and electrochemical properties of stainless steel weld overlay cladding

SURFACE & COATINGS TECHNOLOGY

卷:344

Article

Cao, X. Y.¹  Zhu, P.²  Liu, T. G.¹  Lu, Y. H.¹  Shoji, T.^1,3 

[1] Univ Sci & Technol Beijing, Natl Ctr Mat Serv Safety, 30 Xueyuan Rd, Beijing 100083, Peoples R China

[2] Suzhou Nucl Power Res Inst Co Ltd, 1788 Xiltuan Rd, Suzhou 215004, Peoples R China

[3] Tohoku Univ, Fracture & Reliabil Res Inst, Aoba Ku, 6-6-01 Aoba Aramaki, Sendai, Miyagi 9808579, Japan

关键词: Thermal aging;    Stainless steel weld overlay cladding;    Spinodal decomposition;    Mechanical property;    Intergranular corrosion;   

DOI  :  10.1016/j.surfcoat.2018.02.046

来源: Elsevier

【 摘 要 】

An investigation on mechanical property and electrochemical behavior of the cladding materials aged at 400 degrees C for different times was carried out by small punch test (SPT) and double loop electrochemical potentiokinetic reactivation (DL-EPR) test. The results showed that thermal aging contributed to spinodal decomposition and G-phase formation in the aged ferrite phase, as well as increase of nano-hardness of ferrite phase. The SP energy by the small punch tests decreased with increase of thermal aging time, which was related to the lattice distortions in G-phase and aged ferrite phase and their interactions with dislocations during deformation process. Thermal aging promoted corrosion and intergranular corrosion susceptibility of the cladding materials. Combined effects of G-phase and spinodal decomposition lowered intergranular corrosion resistance of the cladding material.

【 授权许可】

Free