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首页> 外文期刊>ISIJ international >Mechanical Properties of Welded Joints of 780 MPa Grade Ultra-fine Grained Steels
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Mechanical Properties of Welded Joints of 780 MPa Grade Ultra-fine Grained Steels

机译：780 MPa级超细晶粒钢焊接接头的力学性能

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摘要

Three kinds of 780 MPa grade ultra-fine grained steels with different chemical composition were produced by warm rolling. The steels were characterized by ultra-fine ferrite grains (less than 1 mu m). With the steels strength-overmatching welded joints were prepared, and their mechanical properties were investigated. It is found that softening occurred in the heat-affected zone (HAZ) because of the coarsening of ferrite grains due to welding heat input. However, by using low welding heat input and strength-overmatching weld metal, the detrimental effect of softening on strength was restrained, and welded joints with strength equivalent to that of base metal were obtained. The deformability of welded joints was found to be related to the yield ratio (yield strength/tensile strength) of base metal. Low yield ratio is desirable to the deformability of welded joints. The HAZs in the welded joints of low welding heat input of 10 kJ/cm have good impact toughness for all the steels. Except for 0.14C-0.30Si-1.46Mn steel, the HAZs in the welded joints formed from the other two steels also have good impact toughness for welding heat input of 20 kJ/cm, and their fracture appearance transition temperature (vTrs) of the HAZs is lower than -40 deg C, and their Charpy impact energy at -40 deg C exceeds 200 J.
机译：通过热轧生产了三种化学成分不同的780 MPa级超细晶粒钢。这些钢的特征是超细铁素体晶粒（小于1微米）。用这种钢制备了强度不匹配的焊接接头，并研究了它们的力学性能。发现由于焊接热输入导致铁素体晶粒变粗，在热影响区（HAZ）中发生了软化。但是，通过使用低焊接热输入和强度不匹配的焊接金属，可以抑制软化对强度的不利影响，并获得强度与母材相同的焊接接头。发现焊接接头的变形性与母材的屈服比（屈服强度/拉伸强度）有关。对于焊接接头的可变形性，低屈服比是理想的。低焊接热输入10 kJ / cm的焊接接头中的热影响区对所有钢都有良好的冲击韧性。除0.14C-0.30Si-1.46Mn钢外，由其他两种钢构成的焊接接头中的HAZ在输入20 kJ / cm的焊接热时也具有良好的冲击韧性，并且其断裂外观转变温度（vTrs）为HAZ低于-40摄氏度，并且它们在-40摄氏度时的夏比冲击能超过200焦耳。

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