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发展了一种新的断口学技术用来检验在低周疲劳试验中材料的断口,材料取自一个蒸汽涡轮转子的内径区域。用户早期报废了这个铬-钼-钒钢锻造的转子,它成为在威斯汀豪斯公司研究发展中心进行的一项主要研究计划的组成部分(RP502),这项工作得到了电力研究院的赞助。新技术的要点在于对断口进行加热染色,根据不同颜色来清楚地鉴别断口上不同部位的不同断裂机制。 缩孔缺陷仍旧是银白色,条带型疲劳变成棕色,韧性断口是兰色,解理断口从金黄色到紫色。有可能推断出转子试样中裂纹萌生与扩
A new fracture technique was developed to test the fracture of the material in a low cycle fatigue test taken from the inner diameter region of a steam turbine rotor. The user scrapped the chrome-molybdenum-vanadium steel forged rotor, which became part of a major research project at the Westinghouse Research and Development Center (RP502), which was funded by the Electric Power Research Institute sponsor. The point of the new technology is that the fracture is heated and dyed, and the different fracture mechanisms of the different parts of the fracture are clearly identified according to different colors. Shrinkage defects are still silver-white, strip-type fatigue into brown, toughness fracture is blue, cleavage fracture from golden to purple. It is possible to deduce that the crack initiation and expansion in the rotor specimen