摘要
通过SEM和示波冲击试验研究了特厚压力容器用钢板的0、-20、-40℃的冲击韧性及显微组织。结果表明:降低试验温度,t/4和t/2处的E1变化不大,P_m、E_2、E_3+E_4和(P_m-P_f)值减小,脆性断裂趋势增大,脆性断裂止裂变差;t/4处抑制裂纹形成和阻止脆性断裂的能力优于t/2处。t/4处的-20℃冲击断口纤维区由细小韧窝组成,t/2处呈现为准解理断裂形貌。t/2处放射区中河流花样和撕裂棱数量较t/4处增多。同一个珠光体团内部呈现出LP和DP两种形态。t/2处LP片层间距较t/4处增大,DP有所增加。
The impact toughness at 0 ℃, -20℃ and -40℃ and the miernstructure of ultra heavy plate for pressure vessel were investigated by means of SEM and instrumented impact test. Experimental results showed that the test temperature have a great influence on impact toughness of the t/4 and t/2. The maximum impact load （Pm）, ductility fracture propagating energy （E2）, brittle fracture propagating energy （E3） ＋ brittle crack arrest energy （E4） and （Pm-Pf） were decreased with the decreasing of test temperature. brittle fracture tendency increases gradually, brittle fracture arrest properties become worse, while E1 ehanges little. The brittle fracture tendency in t/4 and brittle fracture arrest properties are better than that of t/2. In t/4, the fibre region of impact fracture at - 20 ℃ is made up of tiny dimples, while the fibre region in t/2 exhibits quasi-cleavage. The number of river pattern and tearing ridge in t/2 is more than that of in t/4 in radial region. The pearlite colony is a mixture of lamellar pearlite （LP） and degenerated pearlite （DP）. The DP content in t/2 is increased, the LP＇ s lamellar pearlite interlamellar spacing is larger than that in t/4.
出处
《山东冶金》
CAS
2015年第6期37-39,42,共4页
Shandong Metallurgy
关键词
压力容器用钢
特厚钢板
冲击韧性
显微组织
steel for pressure vessel
ultra heavy plate
impact toughness
microstructure
