Ni-Cr-Mo系合金焊后熔敷金属耐蚀性研究-失效分析与预防.PDF

Ni-Cr-Mo系合金焊后熔敷金属耐蚀性研究-失效分析与预防.PDF

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Ni-Cr-Mo系合金焊后熔敷金属耐蚀性研究-失效分析与预防

2008 2 February, 2008 3 1 Vol. 3, No . 1 Ni-Cr-Mo , , ( 北京工业大学, 材料科学与工程学院, 北京 100022) [ ] N-i Cr-M o ( , ) X , , , 20~ 0m, , T CP ( topologically close-packed) , , ASTM G28 , , H astelloy C-276 , , , M o T CP [ ] ; ; ; TCP ; [ ] T G 1743+ 3 [ ] A [] 1673-6214( 2008) 01-0038-0 Studies on Corrosion Resistant Property of Ni- Cr-Mo System Superalloy LIU Ha-i Zhang, LI Xiao-Yan, HE Ding-Yong (College of Materials Science Engineering, Beij ing University of Technology, Beij ing 100022, China) Abstract: A kind of metal non-slag flux-cored wire and another kind of slag flux-cores wire w ith excellent corrosion resist- ance which are attributed to Ni-Cr-Mo syst em alloy and used to weld C-276 w ere investigated. M et allurgical microstruc- ture of deposited metal w as studied by optical microscope, X-ray diffraction and scanning electron microscope. Micro- structure of deposited metal is homogeneous, gain size is betw een 20m to 0m, w hich is made of austenite and precip-i tated phase. Deposited metal w as sensitized treatment during build-up welding . Topologically close-packed ( T CP) phases precipitated, which caused non-homogeneity of constituent and structure betw een intergranular and matrix , so caused in- tergranular corrosion. T hrough ASTM G28 test corrosion resistant of deposited, the deposited metal is corresponded to Hastelloy C-276. Intergranular corrosion of deposited metal w as preliminarily explored, results show that the T CP phases with enrichment Mo w ere att acked in oxidizing environment. Key words: flux-cored w ire; deposited metal; microstructure; T CP ( topologically close-packed) phase; intergranular cor- rosion

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