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| CHARACTERISTICS OF HYDROGEN DAMAGES FORHYDROGENATION REACTOR WALL-MATERIALS |
| Jian Xv;Manying Zhong;Shixing Guo |
| 中国计量学院 机械与电子工程分院 |
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Abstract The characteristics of hydrogen damages for hydroge nation reactor wall-materials,which include the structure material of 2(1/4)Cr-1 Mo and the weld overlay cladding of 309L and 347L,in original and hydrogen charg ed had been investigated.The results of slow strain rate testing(SSRT)indicated that ⅰ)Fracture stress and plasticity decrease obviously after thermal charging of hydrogen.ⅱ)For original specimens the fracture of both smooth and notched s pecimens occurred in the 347L region(except the specimen which notched in 309L r egion),but if specimens charged with hydrogen the fracture changed in 309L regio n(except the specimen which notched in 347L region).Because after thermally char ging with hydrogen the fracture stress dropped from 885 MPa to 478 MPa for 309 L and from 799.9 MPa to 564 MPa for 347L respectively.The characteristics on low frequency fatigue with short-crack had been investigated.The formula da/dN =C(ΔJ)n was used to calculate the propagation rate(da/dN) in three stages and the conditional threshold value(ΔJth)of the fati gue crack.The results showed that the ΔJth of specimen after thermal hydrogen charged dropped obviously and the da/dN increased.In addition,t he fracture morphology of SSRT and different crack propagation mechanism of low frequency fatigue in three propagation stages had been observed by SEM.
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Received: 08 October 2001
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Corresponding Authors:
Manying Zhong
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