Effect of TiOx Particle on Grain Refining of HAZ
Effect of TiOx particle on grain refining of HAZ during the welding thermal cycle was analyzed. It shows that HAZ would has better post-welding low temperature toughness if it contains plenty of TiOx particles. This phenomenon can be explained by the following aspects. As we know, welding thermal cycle include a rapid heating process and a cooling process. During the heating-up period, high melting TiOx particles which contains NbC with the size below 1μm can make a stronger pining force on the gain boundary migration than pure NbC ones, this effect restrain the austenite growth and control the austenite grain size to a certain extent. Then, when the cooling process begins, TiOx particles containing MnS with the size between 1 to 3μm act as a nucleation site for the intragranular acicular ferrite (IAF). Although the growth of bainite would extrude the IAF and make the smooth edge of IAF deformed, it still can not grow through the IAF. Just owing to the pining effect of TiOx-NbC particles and the hindering effect of IAF induced by the TiOx-MnS particles, prior austenite grains havent undergone a rapid growth during the heating process and these austenite grains are divided into small regions by the IAF finally.
TiOx particles grain refinement intragranular acicular ferrite (IAF) heat-affected zone (HAZ)
SHU Wei WANG Xue-min LI Shu-rui HE Xin-lai
School of Materials Science and Engineering. University of Science and Technology Beijing, Beijing 1 Wuhan Iron and Steel (Group) Corp, Wuhan 430080, China
国际会议
The 6th International Conference on High Strength Low Alloy Steels(第六届高强度低合金钢国际会议HSLA Steels2011)
北京
英文
697-700
2011-05-31（万方平台首次上网日期，不代表论文的发表时间）