Abstract
The influence of prolonged aging on creep embrittlement susceptibility of 1 Cr− 1 2 Mo steel was investigated. Based on the results of notch creep tests, it has been found that the creep life (time to failure) of material subjected to prolonged aging [heat-affected zone (HAZ) material in the as-received state] is increased in the lower stress zone, and thus creep embrittlement susceptibility is improved compared with material in (simulated HAZ material) which has not been subjected to prolonged aging. While the fractures which occurred in materials that had been subjected to prolonged aging were mainly transgranular, those that occurred in material which had not been subjected to prolonged aging were mainly of an intergranular nature. Consequently, it is believed that the improvement in creep embrittlement due to prolonged aging is attributable to reduced transgranular strength and enhanced strength of the grain boundaries.
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