Weld Cold Cracking in HAZ of Engineering Carbon and Low Alloy Steel (Report II) : Applicability of Simulation Test for Cold Cracking of Quenching Crack Type(Materials, Metallurgy & Weldability)

概要

論文の詳細を見る
Thermal and mechanical testing conditions of simple simulation test to evaluate cold cracking susceptibility, which is done by notch tensile test during cooling of a simulated weld thermal cycle, are examined in order to obtain similar quenching crack behavior to that in the RRC test. The test is shown to be available to get the correlation between fracture temperature and fracture stress by applying thermal cycle similar to actual welding and tensile deformation from just above Ms temperature under different cross-head speeds corresponding to contraction rate in actual welding. It is shown that the peak temperature for the simulation test should be set so as to liquate the grain-boundary in order to obtain nearly the same fracture stress as that in the RRC test. Moreover, it is shown that the grain-boundary liquation lowers the fracture stress and promotes the intergranular fracture.
大阪大学の論文