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首页> 外文期刊>Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science >Mechanism of Detrimental Effects of Carbon Content on Cleavage Fracture Toughness of Low-Alloy Steel
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Mechanism of Detrimental Effects of Carbon Content on Cleavage Fracture Toughness of Low-Alloy Steel

机译：碳含量对低合金钢分裂断裂韧性的不利影响机理

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摘要

The variation in fracture toughness of low-alloy base steels and weld steels with carbon contents of 0.08 and 0.21 wt pct was investigated using notched and precracked specimens tested at low temperatures. The attention is focused on the mechanism associated with detrimental effects on cleavage fracture toughness resulting from increasing carbon content. Analyses reveal that, in the case of constant ferrite grain sizes with increasing carbon content, the yield stress #sigma#_y increases and the local fracture stress #sigma#_f remains constant for notched specimens. For precracked specimens, the #sigma#_y increases, whereas the #sigma#_f decreases. In both cases, the ratio #sigma#_f/#sigma#_y decreases; this ratio is one of the principal factors inducing the deterioration in the cleavage fracture toughness of the higher carbon steels. Analyses also reveal that the critical strain for initiating a crack nucleus, which decreases with increasing carbon content and impurity elements, appears to be another principal factor that has a negative effect on the fracture toughness in both notched and precracked specimens. The results of the fracture toughness measured for weld metal with various grain sizes further support the predominant effect of grain size on the toughness of notched specimens.
机译：使用在低温下测试的带缺口和预裂纹试样，研究了碳含量为0.08和0.21 wt％的低合金基钢和焊缝钢的断裂韧性变化。注意力集中在与碳含量增加导致的断裂断裂韧性的有害作用有关的机理上。分析表明，在铁素体晶粒尺寸恒定且碳含量增加的情况下，带缺口试样的屈服应力＃sigma＃_y增大，局部断裂应力＃sigma＃_f保持恒定。对于预裂试样，＃sigma＃_y增加，而＃sigma＃_f减少。在两种情况下，比率＃sigma＃_f /＃sigma＃_y都减小;该比率是引起高碳钢的断裂断裂韧性劣化的主要因素之一。分析还显示，裂纹核起始的临界应变随着碳含量和杂质元素的增加而降低，这似乎是另一个对开槽和预裂纹试样的断裂韧性均产生负面影响的主要因素。对各种晶粒度的焊缝金属测得的断裂韧性结果进一步支持了晶粒度对缺口试样韧性的主要影响。

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