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为了研究某材料在工作介质中的应力腐蚀问题,开展了光滑试样和中心穿透预裂纹试样在温度为T0、不同试验介质中、施加一定预应力水平的恒载荷试验,测试试样的力学性能,分析其金相组织,并测量了预裂纹试样在恒载试验过程中裂纹的扩展量。结果表明:在不同试验介质中,施加(90～95)%σ0.2载荷的光滑试样和施加(30～90)%Kc载荷的预制裂纹试样,经过约13000h的试验后,没有试样发生滞后断裂,试验前后材料的抗拉强度、断裂韧性没有发生显著性变化;预制裂纹试样在恒载过程中裂纹向前扩展,扩展速率在10-5mm/h的数量级;材料在工作介质中不存在应力腐蚀。
In order to study the stress corrosion of a material in the working medium, a constant load test was carried out on the smooth specimen and the center penetrated pre-crack specimen at a temperature of T0 and a certain pre-stress level in different test media. The mechanical properties were analyzed, the microstructure was analyzed, and the crack growth was measured in the pre-cracked specimen during the dead-load test. The results show that in the different test media, there is no sample after applying a smooth sample of (90-95%) σ0.2 load and pre-cracked sample of (30-90%) Kc load after about 13000h Hysteresis fracture occurred before and after the test. The tensile strength and fracture toughness of the pre-cracked specimen did not change significantly. The cracks propagated forwardly in the process of constant load with an expansion rate of 10-5mm / h. In the working medium There is no stress corrosion.