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本文用表面裂纹法测定了37SiMnCrMoV钢(37钢) 板试样在0.5%K_2Cr_2O_7和1%Na_2B_4O_7两种介质中的应力腐蚀开裂行为;测定了K_2Cr_2O_7浓度、表面裂纹深度和宽度对该钢应力腐蚀开裂的影响。结果表明,37钢在0.5% (约0.01M) K_2Cr_2O_7水介质中的应力腐蚀开裂是高度敏感的,K_(13cc)仅为54.5kg/mm~(3/2),K_(13cc)/K_(1c)为0.29;随着K_2Cr_2O_7浓度增加,延迟断裂时间延长;采用1%Na_2B_4O_7水溶液作为试验介质可起到阻止尖锐裂纹试样应力腐蚀开裂的良好作用,K_(13cc)高达112.1kg/mm~(3/2),K_(13cc)/K_(1c)为0.55;电镜断口观察表明,随着K_2Cr_2O_7浓度的增加,沿晶断口减少,准解理和孔坑断口增加。
In this paper, the stress corrosion cracking behavior of 37SiMnCrMoV steel (37 steel) plate in 0.5% K_2Cr_2O_7 and 1% Na_2B_4O_7 was measured by surface crack method. The effects of K_2Cr_2O_7 concentration, surface crack depth and width on stress corrosion cracking Impact. The results show that the stress corrosion cracking of 37 steel in 0.5% (about 0.01M) K 2 Cr 2 O 7 aqueous medium is highly sensitive. The K 13cc is only 54.5 kg / mm 3 3/2 K 13cc / 1c) was 0.29. With the increase of K 2 Cr 2 O 7 concentration, the delayed rupture time was prolonged. Adopting 1% Na 2 B 4 O 7 aqueous solution as the test medium can play a good role in preventing the stress corrosion cracking of the sharp cracked specimen. The maximum value of K 13C 1 112.1 kg / mm ~ 3/2) and K_ (13cc) / K_ (1c) were 0.55, respectively. The SEM observation showed that along K_2Cr_2O_7 concentration decreased along the intergranular fracture, quasi cleavage and pore crater fracture increased.