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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Zr Addition on the Microstructure and Toughness of Coarse-Grained Heat-Affected Zone with High-Heat Input Welding Thermal Cycle in Low-Carbon Steel
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Effect of Zr Addition on the Microstructure and Toughness of Coarse-Grained Heat-Affected Zone with High-Heat Input Welding Thermal Cycle in Low-Carbon Steel

机译：Zr添加对低碳钢高热输入焊接热循环粗粒热影响区微观结构和韧性的影响

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摘要

Microstructures and toughness of coarse-grained heat-affected zone (CGHAZ) with high-heat input welding thermal cycle in Zr-containing and Zr-free low-carbon steel were investigated by means of welding thermal cycle simulation. The specimens were subjected to a welding thermal cycle with heat inputs of 100, 400, and 800 kJ cm(-1) at peak temperature of 1673 K (1400 degrees C) using a thermal simulator. The results indicate that excellent impact toughness at the CGHAZ was obtained in Zr-containing steel. The Zr oxide is responsible for AF transformation, providing the nucleation site for the formation AF, promoting the nucleation of AF on the multi-component inclusions. High fraction of acicular ferrite (AF) appears in Zr-containing steel, acting as an obstacle to cleavage propagation due to its high-angle grain boundary. The morphology of M-A constituents plays a key role in impact toughness of CGHAZ. Large M-A constituents with lath form can assist the micro-crack initiation and seriously decrease the crack initiation energy. The relationship of AF transformation and M-A constituents was discussed in detail.
机译：通过焊接热循环模拟研究了含Zr和无Zr的低碳钢中高热输入焊接热循环的粗粒热影响区域（CGHAZ）的微观结构和韧性。使用热模拟器，在1673k（1400℃）的峰值温度下，用100,400和800kJcm（-1）的热输入进行焊接热循环。结果表明，在含Zr的钢中获得了CGHAZ的优异的冲击韧性。 Zr氧化物负责AF转化，为形成AF提供成核位点，促进多组分夹杂物上的AF成核。高分的针状铁氧体（AF）出现在含Zr的钢中，作为其高角度晶界引起的裂解传播的障碍物。 M-A组分的形态在CGHAZ的影响韧性中起着关键作用。大型M-A成分具有板条形式可以帮助微裂纹启动并严重降低裂纹启动能量。详细讨论了AF变换和M-A成分的关系。

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