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首页> 外文期刊>International Materials Reviews >Hot ductility of steels and its relationship to the problem of transverse cracking in continuous casting
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Hot ductility of steels and its relationship to the problem of transverse cracking in continuous casting

机译：钢的热延性及其与连铸横向裂纹问题的关系

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The influence of composition and cooling rate on the hot ductility of steels has been reviewed. Models to predict hot ductility behaviour have been discussed and the parts of the trough which can be used to predict the likelihood of cracking occurring are highlighted. On tensile testing both deformation induced ferrite in sufficient quantity to improve ductility and dynamic recrystallisation occur but not when straightening during continuous casting; the strain being too low. This limits the use of the hot ductility curve in predicting cracking behaviour. The temperature range in which straightening of the continuously cast strand should be carried out is either 30°C below the Ar_3 when there is a large amount of ferrite (approx 40%) present before deformation or above the T_d, the temperature at which dynamic recrystallisation starts to take place in a tensile test; this being when the ferrite film no longer forms and precipitates are sufficiently coarse and few in number to influence the ductility. The influence of C,Mn,N, Nb,V,B,Ti,AI and the residuals Cu and Sn on hot ductility are examined and recommendations made with regard to the amounts and cooling conditions required to give freedom from transverse and edge cracks. The hot ductility of the new transformation induced plasticity (TRIP) and twin induced plasticity (TWIP) steels has also been reviewed. P has been shown to have little influence on the hot ductility, but for Al based TRIP and TWIP steels, Al levels need to be closely controlled and high Al levels, (1 · 5 to 2%Al) are favoured.
机译：综述了成分和冷却速率对钢热延展性的影响。已经讨论了预测热延性行为的模型，并着重介绍了可用于预测裂纹发生可能性的波谷部分。在拉伸试验中，会产生足够数量的形变引起的铁素体以改善延展性和动态再结晶，但在连续铸造过程中矫直时则不会。应变太低。这限制了热延性曲线在预测开裂行为中的用途。当变形前存在大量铁素体（约40％）时，应将连铸坯拉直的温度范围是Ar_3以下30°C或T_d（动态再结晶的温度）以上开始进行拉伸试验;这是因为不再形成铁素体膜并且析出物足够粗糙并且数量很少以影响延展性。研究了C，Mn，N，Nb，V，B，Ti，Al和残留的Cu和Sn对热延展性的影响，并就避免横向和边缘裂纹所需的数量和冷却条件提出了建议。还对新型相变诱导塑性（TRIP）和双相诱导塑性（TWIP）钢的热延展性进行了综述。已显示P对热延展性影响很小，但是对于Al基TRIP和TWIP钢，需要严格控制Al含量，并且偏爱较高的Al含量（1-5·2％Al）。

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