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首页> 外文会议>Iron Steel Supplement 2005 vol.40: The Joint International Conference of HSLA Steels 2005 and ISUGS 2005 >Effect of TiN Inclusions on Impact Toughness of Low Carbon Microalloyed Steels
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Effect of TiN Inclusions on Impact Toughness of Low Carbon Microalloyed Steels

机译：TiN夹杂物对低碳微合金钢冲击韧性的影响

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摘要

The influence of TiN inclusions on the impact toughness of low carbon steels micro-alloyed with titanium, vanadium and boron was investigated. The microstructures of the three experimental steels with different Ti/N, 2.44, 3.5 and 4.2 (designated as Steels A, B and C), were all granular bainite. However the Charpy V-notch tests (CVN) showed that Steel A got the highest toughness over 300J at both room temperature and -20°C, whereas Steels B and C showed the toughness of below 20J at -20°C and of 274J and 138J, respectively, at room temperature. SEM fractography revealed that coarse TiN inclusions acted as the culprits to the cleavage initiation in Steels B and C. The effect of Ti and N levels on TiN formation and growth was analyzed by using alloy thermodynamics. It seems that not only Ti/N but also the product of gross Ti and N plays the important roles in TiN formation and growth. The product of gross Ti and N contents should not be larger than the solubility product of TiN at the solidus lest the TiN particles precipitate before solidification, and the Ti/N should also keep lower than the stoichiometric coefficient, 3.42, in order to ensure low growth rate for TiN at soaking.
机译：研究了TiN夹杂物对微合金化钛，钒和硼的低碳钢冲击韧性的影响。三种具有不同Ti / N，2.44、3.5和4.2的实验钢的微观组织（分别称为钢A，B和C）均为粒状贝氏体。但是，夏比V型缺口试验（CVN）表明，在室温和-20°C下，钢A的韧性均超过300J，而钢B和C在-20°C时的韧性低于20J，而在274J和274J时，韧性最高。室温下分别为138J。 SEM断层扫描显示，粗TiN夹杂物是引起钢B和C裂解的罪魁祸首。使用合金热力学分析了Ti和N含量对TiN形成和生长的影响。似乎不仅Ti / N，而且Ti和N的总产物在TiN的形成和生长中也起着重要的作用。 Ti和N的总含量的乘积不应大于固相线上TiN的溶解度乘积，以免TiN颗粒在凝固前沉淀，并且Ti / N也应保持低于化学计量系数3.42，以确保较低的固含量。浸泡时TiN的增长率。

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