【摘要】 采用一种新型的奥氏体不锈钢作为耐空泡腐蚀涂层,先表面堆焊,然后进行TIG(钨极惰性气体保护焊)表面重熔改性加工.根据ASTM G32/92标准,空泡腐蚀由超声波振动设备完成.利用X射线衍射仪和扫描电镜(SEM)对试样的空泡腐蚀行为进行了跟踪观察,并对试样的空泡腐蚀率进行了测定.结果表明:在空泡腐蚀过程中,先后发生了相变和马氏体片层的扭曲断裂.空泡冲击能诱发奥氏体到马氏体的相变,并被其吸收;当相变达到饱和点时,马氏体片层开始吸收冲击能,同时逐渐发生扭曲和断裂,最终马氏体片层断裂产生的碎片大量剥落,该材料的空泡腐蚀潜伏期结束.更多还原

【Abstract】 A new kind of austenitic stainless steel has been investigated for its cavitation erosion beha-(vior.Cavitation) erosion tests were done on an ultrasonic vibratory apparatus according to ASTM G32/92.During the cavitation erosion tests,the specimens were observed by scanning electron microscopy(SEM) and X-ray diffraction(XRD),and the cavitation erosion rate of the specimen was measured.At first the γ-austenite to ε-martensite phase transformation absorbed a great deal of impact energy.After the phase transformation reached the saturated period,impact energy was absorbed by the distortion and fracture of the ε-martensite plates.The two factors contribute to a long incubation period of the specimen.Finally lots of small fragments made by the fracture of the martensite plates peeled off.Thus the incubation(period) of cavitation erosion ended.更多还原