Impact Toughness and Microstructure of Ultra Heavy Plate for Pressure Vessel
HUANG Shaowen
Abstract：The impact toughness at 0 ℃,-20 ℃ and-40 ℃ and the microstructure 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 changes 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.
Keywords：steel for pressure vesselultra heavy plateimpact toughnessmicrostructure
Publication Date：2015-11-01
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：4( 37-39,42 )