Assessment of toughness in long term service CrMo low alloy steel by fracture toughness and small punch test

作者：Guan, Kaishu^*; Hua, Li; Wang, Qiongqi; Zou, Xiaohui; Song, Ming

来源：Nuclear Engineering and Design, 2011, 241(5): 1407-1413.

DOI：10.1016/j.nucengdes.2011.01.031

• TEMPER EMBRITTLEMENT
• GRAIN-SIZE
• SEGREGATION
• COMPONENTS
• SPECIMEN
• DIAMETER

Small punch test (SPT) is a miniature sample test technique which can evaluate in-service material properties with an almost non-destructive method. In this paper, the 2.25Cr1Mo steel samples serviced for 10 years in hydrogenation reactor (with temper embrittlement), 1.25Cr0.5Mo supper-pressure vapor pipe serviced for 14 years at 520 degrees C and several other low alloy steels have been studied by J(IC) fracture toughness and SPT. The linear relationship between the small punch (SP) equivalent fracture strain and the fracture toughness of J(IC) was created. The correlations applied to the experimental data indicated advantages of using SPT for the determining fracture toughness of in-serviced low alloy steels. Additionally, size affects the fracture pattern. Small punch samples of small size show dimple fractures whereas large fracture toughness samples show quasi-cleavage fractures.

• 出版日期2011-5
• 单位华东理工大学