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首页> 外文期刊>ISIJ international >Influence of Oxide Particles and Residual Elements on Microstructure and Toughness in the Heat-Affected Zone of Low-Carbon Steel Deoxidized with Ti and Zr
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Influence of Oxide Particles and Residual Elements on Microstructure and Toughness in the Heat-Affected Zone of Low-Carbon Steel Deoxidized with Ti and Zr

机译：氧化物和残余元素对Ti和Zr脱氧低碳钢热影响区组织和韧性的影响

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The microstructure and toughness in Fe–0.04%C–1.85%Mn–0.03%Si–0.018%Nb steel deoxidized with Ti and Zr have been studied as functions of particle characteristics, austenite grain size and soluble Ti and Zr contents using a simulated HAZ (heat affected zone) thermal cycle (peak temperature, 1400°C; peak holding time, 60 s; time of cooling from 800 to 500°C, 70 s) and submerged arc welding (heat input of 15 kJ/mm), respectively. Microstructures were studied in samples containing 1.0 to 1.5 μm-diameter oxide particles numbering 500 to 2000 mm~(–2) and with a soluble oxygen content of 10 to 30 ppm (measured before casting) and soluble Ti and Zr contents of 50–150 ppm. The γ grain size after HAZ thermal cycle in the range between 200 and 600 μm is controlled by pinning and solute drag. Small γ grain size below 300 μm was obtained with high soluble Ti and Zr contents of 110–160 ppm, whereas large γ grain size above 300 μm was obtained with low soluble Ti and Zr contents of 60–110 ppm. Two types of microstructures that showed high Charpy absorbed energy (VE(–10°C)= 150–250 J and VE(–50°C)= 50–150 J) were observed independent of γ grain size: One is acicular ferrite and a small amount of grain boundary ferrite (GBF) and ferrite side plate (FSP) and the other is GBF, FSP and granular bainitic ferrite. It was observed that low VE(T) values are attributed to the formation of porosity, large-size particles, carbides (+nitrides) and lathe bainitic ferrite.
机译：使用模拟热影响区研究了用Ti和Zr脱氧的Fe–0.04％C–1.85％Mn–0.03％Si–0.018％Nb钢的组织和韧性与颗粒特性，奥氏体晶粒尺寸以及可溶性Ti和Zr含量的关系。 （热影响区）热循环（峰值温度1400°C;峰值保持时间60 s;从800到500°C的冷却时间70 s）和埋弧焊（热量输入15 kJ / mm） 。在样品中研究了微结构，该样品包含直径为1.0到1.5μm的氧化物颗粒，数量为500到2000 mm〜（–2），可溶性氧含量为10到30 ppm（铸造前测量），可溶性Ti和Zr含量为50-150 ppm。热影响区热循环后的γ晶粒大小在200到600μm之间，通过钉扎和溶质阻力来控制。较高的可溶性Ti和Zr含量为110-160 ppm时，可获得小于300μm的小γ晶粒，而较低的可溶性Ti和Zr含量为60-110 ppm时，可获得大于300μm的大γ晶粒。观察到两种具有高夏比吸收能的微结构（VE（–10°C）= 150–250 J和VE（–50°C）= 50–150 J），与γ晶粒尺寸无关：一种是针状铁素体，另一种是针状铁素体。少量的晶界铁素体（GBF）和铁素体侧板（FSP），另一个是GBF，FSP和粒状贝氏体铁素体。观察到低VE（T）值归因于孔隙率，大尺寸颗粒，碳化物（+氮化物）和车床贝氏体铁素体的形成。

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