Comparison on Approaches Evaluating Irradiation Embrittlement of Pressure Vessel Steel
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摘要: 虽然经过了30多年的努力,在脆性转变温度区域预测压力容器用钢的断裂韧性仍然存在较大的不确定性。通过比较现有的评价材料断裂韧性的方法,对近些年发展起来的特征曲线法的理论基础提出质疑,指出传统的参照脆性转变温度的断裂韧性曲线法是建立在较坚实的物理基础之上,虽然常被认为过于保守,却是可靠的。通过对单相组织和多相组织断裂韧性试验结果的分析,强调在理论和实践上解决解理断裂韧性不确定性的出路在于对解理断裂物理过程的认识和评价方法的改进。Abstract: Although efforts have been made to establish the cleavage fracture model in the past for more than 30 years,uncertainties remain in predicting the cleavage fracture toughness behavior of pressure vessel steels in the transition region.In this paper,the traditional approach and Master Curve approach of describing the cleavage fracture toughness of pressure vessel steels in the transition region are discussed and compared.The need for focusing on the fundamental principles and criteria of cleavage fracture is addressed.
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