一种钴基合金的空泡腐蚀行为研究
CAVITATION BEHAVIOR OF A Co-BASE ALLOY
摘 要
采用一种新型的钴基合金作为耐空泡腐蚀涂层,进行MIG(熔化极氩弧焊)表面堆焊.根据ASTM G32/92标准进行空泡腐蚀试验.用XRD法和SEM对空泡腐蚀前后合金表面进行相分析和形貌观察.结果表明:空泡腐蚀先后促进了合金相变和马氏体片层的扭曲断裂.而相变和马氏体片层的扭曲断裂正是吸收空泡冲击能的两大途径.最终马氏体片层断裂产生的碎片被大量剥落,此时该材料的空泡腐蚀潜伏期结束.
钴基合金
相变
马氏体
Cavitation
Co-base alloy
Phase transformation
Martensite
Abstract
A new kind of Co base alloy was investigated for its cavitation behavior.Cavitation tests were performed using an ultrasonic vibratory apparatus according to ASTM G32/92.At first the phase transformation from γ-austenite to ε-martensite absorbed a great deal of impact energy.After the phase transformation got to the saturated period,impact energy was absorbed by the distortion and fracture of the ε-martensite plates.The two factors contributed to a long incubation period of the specimen.Finally lots of small fragments made by the fracture of the martensite plates were peeled off and at the same time the incubation period of cavitation was over.
中图分类号 TG172.9
所属栏目 试验研究
基金项目 江苏省工业攻关项目(BE2004089)
收稿日期 2005/12/29
修改稿日期 2006/1/14
网络出版日期
作者单位点击查看
引用该论文: FENG Liang-hou,LEI Yu-cheng,ZHAO Xiao-jun. CAVITATION BEHAVIOR OF A Co-BASE ALLOY[J]. Corrosion & Protection, 2006, 27(11): 558～560
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【3】Richman R H.Cavitation-erosion behavior with mechanical properties of metal[J].Wear,1990,(140):63-82.
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【5】Murugan N,Parmar R S.Stainless steel caldding deposited by automatic gas metal arc welding[J].Welding Research Supplement,1997,(11):391-403.
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【7】Xiaojun Z,Procopiak L A J,et al.Phase transformation during cavitation erosion of a Co stainless steel[J].Material Science and Engineering A,2003,358:199-204.
【8】John Price Hirth,Jens Lothe.Theory of dislocation[M].New York:John Wiley & Sons,1982.306-353.
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