采用恒载荷拉伸应力腐蚀实验研究了23Co14Ni12Cr3及40CrNi2Si2MoVA两种超高强度钢在质量分数为3.5%的NaCl溶液中的应力腐蚀开裂行为,为两种超高强度钢在结构件中的安全使用提供数据依据。通过金相显微镜和扫描电镜(SEM)对两种超高强度钢的显微组织以及断口形貌进行了分析。恒载荷拉伸应力腐蚀实验结果表明,23Co14Ni12Cr3钢在相同应力水平下的断裂时间比40CrNi2Si2MoVA钢的断裂时间长,这说明23Co14Ni12Cr3钢的抗应力腐蚀性能优于40CrNi2Si2MoVA钢。断口的形貌分析表明两种超高强度钢在应力和腐蚀介质的共同作用下发生断裂,断口显现出为沿晶断裂和韧窝断裂的形貌。
The behavior of stress corrosion crack of two kinds of ultrahigh strength steel, 23Co14Ni12Cr3 and 40CrNi2Si2MoVA, in 3.5% NaCl solution are investigated with the constant load tensile stress corrosion method. The microstructure and fracture surface of the two ultrahigh strength steels are analyzed by metalloscopy and scanning electron microscopy (SEM). The results of constant load tensile stress corrosion test show that at the same stress level the fracture time of steel 23Co14Ni12Cr3 is longer than that of 40CrNi2Si2MoVA, which means 23Co14Ni12Cr3 possesses better corrosion resistance. The fracture morphology analysis shows that the fracture surface of the two ultrahigh strength steels has the characteristic of intergranular fracture and dimple fracture under the joint action of stress and corrosive solution.
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