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首页> 外文期刊>Metallurgia Italiana >EFFECT OF CARBON CONTENT ON THE PHASE TRANSFORMATION CHARACTERISTICS, MICROSTRUCTURE AND PROPERTIES OF 500 MPa GRADE MICROALLOYED STEELS WITH NON-POLYGONAL FERRITE MICROSTRUCTURES
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EFFECT OF CARBON CONTENT ON THE PHASE TRANSFORMATION CHARACTERISTICS, MICROSTRUCTURE AND PROPERTIES OF 500 MPa GRADE MICROALLOYED STEELS WITH NON-POLYGONAL FERRITE MICROSTRUCTURES

机译：碳含量对具有非多边形铁素体显微组织的500 MPa级微合金钢的相变特性，显微组织和性能的影响

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The influence of C in the range of 0.011-0.043 wt-percent on the phase transformation characteristics, mechanical properties and microstructure of Fe-2.0Mn-0.25Mo-0.8Ni-0.05Nb-0.03Ti steel was investigated. In the dilatometric experiments, it was found that a reduction in the C content increased the phase transformation temperatures, decreased the hardness and promoted quasi-polygonal ferrite (QF) formation over granular bainiticferrite (GBF) and bainitic ferrite (BF), but at the same time the sensitivity of the phase transformation temperatures and hardness to cooling rates was reduced. Mechanical testing of laboratory hot rolled plates revealed that the targeted yield strength of 500 MPa was reached even in the steel with the lowest C content (0.011 wt-percent). An increase in C content did not considerably increase the yield strength, although the tensile strength was more significantly increased. Impact toughness properties, in turn, were markedly deteriorated due to this C content increment. Microstructural analysis of the hot rolled plates showed that an increase in C content decreased the fraction of QF and consequently increased the fraction of GBF and BF, as well as the size and fraction of C-enriched secondary microconstituents. In addition, the size of the coarsest crystallographic packets seemed to be finer in the low C steel with QF dominated microstructure than in its higher C counterparts with higher fractions of GBF-BF, even thought the average crystallographic packet size was slightly finer in these higher C steels. Mechanical testing of the simulated CGHAZ's showed that their toughness properties are not strongly dependent on C content, although there exists a general trend for toughness to slightly weaken with increasing C content. It could be concluded that HAZ toughness properties of these types of steels are acceptable. On the basis of dilatometric experiments, mechanical testing and microstructural analysis it can be stated that a good combination of strength, toughness and weldability as well as microstructural stability can be reached in very low C steels with QF dominated microstructures. Finally, an example of this type of microstuctural concept, which has been successfully
机译：研究了0.01-0.043 wt％的C对Fe-2.0Mn-0.25Mo-0.8Ni-0.05Nb-0.03Ti钢的相变特性，力学性能和组织的影响。在膨胀实验中，发现C含量的降低会增加相变温度，降低硬度并促进准多边形铁素体（QF）的生成，而颗粒状贝氏体铁素体（GBF）和贝氏体铁素体（BF）却如此。同时降低了相变温度和硬度对冷却速率的敏感性。实验室热轧板的机械测试表明，即使在碳含量最低（0.011 wt％）的钢中，也可以达到500 MPa的目标屈服强度。 C含量的增加并未显着提高屈服强度，尽管抗拉强度更为显着地提高了。进而，由于该C含量的增加，冲击韧性特性显着劣化。热轧板的显微组织分析表明，C含量的增加降低了QF的比例，从而增加了GBF和BF的比例，以及富C的次级微成分的尺寸和比例。此外，在QF为主的低碳钢中，最粗糙的晶体包的尺寸似乎比具有较高GBF-BF分数的较高C的同类产品更细，甚至认为在这些较高的C中，平均晶体包的尺寸稍细。 C钢。对模拟的CGHAZ的机械测试表明，尽管C含量随C含量的增加而略有降低，但其韧性却与C含量无关。可以得出结论，这些类型的钢的HAZ韧性性能是可以接受的。根据膨胀测量实验，机械测试和显微组织分析，可以说，在QF为主的超低碳钢中，强度，韧性和可焊性以及显微组织稳定性可以很好地结合在一起。最后，这种微观结构概念的例子已经成功地

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