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对某制药厂离心机转鼓炸裂事故进行了系统分析和实验研究。结果发现 :转鼓材料0Cr1 7Ni4Cu3Mo2Nb在 0 .5mol/LNaCl+ 2 .5mol/LH2 SO4模拟工况中对应力腐蚀开裂十分敏感。该材料的KIC约为 80MPam1/ 2 ,其KISCC则只有 1 4MPam1/ 2 ;慢拉伸时的最大断裂应力和最大伸长量 ,分别只及空气中的 59%和 3 0 %。恒载荷试验测得其门槛应力σth只有 1 50MPa ,不到强度极限的 1 2 %。该离心机转鼓炸裂 ,即属应力腐蚀开裂所致。
The system analysis and experimental research on the centrifuge drum burst in a pharmaceutical factory were carried out. The results show that the 0Cr1 7Ni4Cu3Mo2Nb is very sensitive to stress corrosion cracking in 0.5 mol / LNaCl + 2.5 mol / LH2 SO4 simulation. The KIC of this material is about 80 MPam1 / 2 and KISCC is only 14 MPam1 / 2. The maximum stress at break and the maximum elongation at slow stretching are only 59% and 30% of the air, respectively. The constant load test measured the threshold stress σth only 1 50MPa, less than 12% of the intensity limit. The centrifuge drum burst, that is caused by stress corrosion cracking.