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首页> 外文期刊>Proceedings of the institution of mechanical engineers >The effect of heat treatment on the mechanical properties of a low carbon steel (0.1%) for offshore structural application
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The effect of heat treatment on the mechanical properties of a low carbon steel (0.1%) for offshore structural application

机译：热处理对海上结构应用低碳钢（0.1％）力学性能的影响

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摘要

In this study, a low carbon cast steel (0.1% C) alloy designed for offshore structures, and the mechanical properties of the alloy under different heat treatment cycles have been evaluated. The effect of austenitizing time on the austenite grain size was studied. Subsequently, the quenched samples with minimum austenite grain size subjected to tempering experiments at different tempering temperatures (450 ℃, 550 ℃, and 650 ℃) and cooling rates (0.23, 36, and 50℃/s) from the temperature. The results showed that by increasing the austenitizing time, the austenite grain size initially decreased and reached the minimum value with ASTM number of 6.35 and then followed by an increase. When the tempering temperature increased, yield and tensile strengths decreased, whereas the ductility properties improved. In addition, yield and tensile strengths were not affected by cooling rate from tempering temperature, whereas the ductility properties were slightly affected. The increase in tempering temperature significantly led to improvement in the toughness to fracture of the alloy. The effect of cooling rate on impact energy for the samples tempered at 450 ℃ and 550 ℃ was negligible. By the contrast, impact energy for the samples tempered at 650 ℃ was markedly affected by cooling rate, in which the highest value was achieved for a cooling rate of 50℃/s.
机译：在这项研究中，评估了一种用于海上结构的低碳铸钢（0.1％C）合金，并评估了该合金在不同热处理周期下的机械性能。研究了奥氏体化时间对奥氏体晶粒尺寸的影响。随后，在不同的回火温度（450℃，550℃和650℃）和冷却速率（0.23、36和50℃/ s）下，对具有最小奥氏体晶粒尺寸的淬火样品进行回火实验。结果表明，通过增加奥氏体化时间，奥氏体晶粒尺寸开始减小，并在ASTM值为6.35时达到最小值，然后增加。当回火温度升高时，屈服强度和拉伸强度降低，而延展性提高。另外，屈服强度和拉伸强度不受回火温度的冷却速率的影响，而延展性受到的影响很小。回火温度的升高明显导致合金断裂韧性的提高。冷却速度对在450℃和550℃回火的样品的冲击能量的影响可以忽略不计。相比之下，在650℃回火的样品的冲击能量受冷却速率的显着影响，其中在50℃/ s的冷却速率下达到最高值。

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