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对比在空化作用下双相不锈钢和奥氏体不锈钢腐蚀表层力学性质的变化规律,研究了表层力学性质的劣化与空泡腐蚀质量损失、腐蚀微观形貌之间的关系。结果表明,在空化作用下,微观组织对不锈钢腐蚀表层力学性质(H/E)的影响随着表层深度的变化而显著。两种具有不同微观组织的不锈钢的空泡腐蚀形貌有明显的差异,但是都存在一个发生严重腐蚀失效的表层力学性质劣化阈值。一旦腐蚀表层力学性质的劣化低于劣化阈值,空泡腐蚀的质量损失急剧增大,空泡腐蚀形貌显著改变。这个阈值的数值与不锈钢的微观组织无关。
The variation of mechanical properties of the corrosion surface of the duplex stainless steel and the austenitic stainless steel under cavitation was contrasted. The relationship between the mechanical properties of the surface layer and the cavitation corrosion mass loss and the corrosion microstructure was studied. The results show that under cavitation, the influence of microstructure on the mechanical properties (H / E) of stainless steel corrosion surface is significant with the depth of surface layer. There are obvious differences between two kinds of cavities corrosion morphology of stainless steel with different microstructures, but there is a threshold value of the degradation of surface mechanics properties in serious corrosion failure. Once the deterioration of mechanical properties of the corrosion surface is below the degradation threshold, the mass loss of cavitation erosion dramatically increases and the cavitation corrosion morphology changes significantly. The value of this threshold has nothing to do with the microstructure of stainless steel.