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Mechanism of Improving Heat-Affected Zone Toughness of Steel Plate with Mg Deoxidation after High-Heat-Input Welding

机译：用Mg脱氧改善钢板热影响区域韧性的机理，高热输入焊接

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摘要

In the present study, the mechanism of improving HAZ toughness of steel plate with Mg deoxidation after the simulated welding with the heat input of 400 kJ/cm was investigated through in situ observation, characterization with SEM-EDS and TEM-EDS, and thermodynamic calculation. It was found that intragranular acicular ferrite (IAF) and polygonal ferrite (PF) contributed to the improvements of HAZ toughness in steels with Mg deoxidation. With the increase of Mg content in steel, the oxide in micron size inclusion was firstly changed to MgO-Ti2O3, then to MgO with the further increase of Mg content in steel. The formation of nanoscale TiN particles was promoted more obviously with the higher Mg content in the steel. The growth rates of austenite grains at the high-temperature stage (1400~1250 °C) during the HAZ thermal cycle of steels with conventional Al deoxidation and Mg deoxidation containing 0.0027 and 0.0099 wt% Mg were 10.55, 0.89, 0.01 μm/s, respectively. It was indicated that nanoscale TiN particles formed in steel with Mg deoxidation were effective to inhibit the growth of austenite grain. The excellent HAZ toughness of steel plates after welding with a heat input of 400 kJ/cm could be obtained by control of the Mg content in steel to selectively promote the formation of IAF or retard the growth of austenite grain.
机译：在本研究中，通过原位观察研究模拟焊接在模拟焊接后用Mg脱氧改善钢板HAZ韧性的机理，用SEM-EDS和TEM-EDS表征，表征，以及热力学计算。发现鞘内针状铁氧体（IAF）和多边形铁素体（PF）有助于改善Mg脱氧的钢中的HAZ韧性。随着钢中的Mg含量的增加，将微米尺寸的氧化物夹杂物首先改变为MgO-Ti2O3，然后以钢中的Mg含量的进一步增加Mg含量。纳米级锡颗粒的形成更明显地促进了钢中较高的Mg含量。在具有常规Al脱氧和含有0.0027和0.0099wt％Mg的钢的HAT热循环期间奥氏体晶粒在高温阶段（1400〜1250℃）的生长速率为10.55,0.89,0.01μm/ s，分别。结果表明，用Mg脱氧形成的钢形成铝颗粒是有效抑制奥氏体晶粒的生长。通过控制400kJ / cm的热输入焊接后钢板的优异HAZ韧性可以通过控制钢中的Mg含量来获得选择性地促进IAF的形成或延缓奥氏体晶粒的生长。

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