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首页> 外文期刊>三菱製鋼技報 >Effect of (Si) Content on the Yield Ratio of a High Strength and High Toughness Bainitic Microalloyed Steel for Hot-Forgings
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Effect of (Si) Content on the Yield Ratio of a High Strength and High Toughness Bainitic Microalloyed Steel for Hot-Forgings

机译：（Si）含量对高强度高韧性贝氏体热锻微合金钢屈服比的影响

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The bainitic microalloyed steel for hot-forgings has the excellent properties of the tensile strength and the impact characteristic. However, the yield strength of the bainitic microalloyed steel is not satisfied as compared with the ordinary quenched and tempered steel for ho-forgings. Therefore, several investigations including heat treating operations were carried out for the purpose of increasing the yield ratio ( #sigma#_(0.2)/ #sigma#_B) of the high strength and high toughness bainitic microalloyed steel for hot4orgings. The following results were obtained.(1) The yield ratio of the bainitic microalloyed steel was increased by means of the tempering treatment at 450 deg C approx 600 deg C.(2) The yield ratio of the bainitic microalloyed steel was also increased by means of the cooling rate controlling treatment, in which treatment the forged steel was ordinary air cooled until near the bainite transforming start temperature and after then slow cooled in the box.(3) (Si) content was correlated to the amount of retained austenite and the higher yield ratio was obtained with less amount of retained austenite. This phenomenon is seemed to be caused that the local deformation in the steel is suppressed owing to decrease the amount of the retained austenite which is thought to be more deformable than matrix from the crystal structure point of view.(4) The amount of retained austenite was correlated to the (Si) content and then less amount of retimed austenite was obtained with lower (Si) content This phenomenon is seemed to be caused that the austenite is difficult to retain at the room temperature because the carbon enrichment of austenite phase is suppressed owing to decrease the (Si) content which delay carbon diffusion during the bainite transformation from austenite.(5) Therefore, the yield ratio is able to be improved without any additional heat treating operations by means of suppressing the amount of retained austenite by decreasing (Si) content. And this method is thought to be the most preferable from energy saving and economical point of view.We have already developed the new bainitic microalloyed steels having improved the yield ratio from above findings and these steels are being practically used as microalloyed steel for the steering parts of the trucks.
机译：用于热锻的贝氏体微合金钢具有优异的拉伸强度和冲击特性。但是，与普通的锻件用回火钢相比，贝氏体微合金钢的屈服强度不能令人满意。因此，为了提高用于热组织的高强度高韧性贝氏体微合金钢的屈服比（#sigma #_（0.2）/＃sigma＃_B），进行了包括热处理操作在内的若干研究。得到以下结果：（1）通过在450℃至约600℃下进行回火处理来提高贝氏体微合金钢的屈服比。（2）借助于方法也提高了贝氏体微合金钢的屈服比。 （3）（Si）的含量与残余奥氏体的量和合金的残余量相关，其中冷却速率控制处理是将锻钢进行普通风冷直至贝氏体转变开始温度附近，然后在箱中缓慢冷却。较少的残余奥氏体含量可获得较高的屈服比。这种现象似乎是由于减少了残余奥氏体的量而抑制了钢中的局部变形，从晶体结构的角度来看，残余奥氏体的量比基体更容易变形。（4）奥氏体的残余量与（Si）含量相关，然后获得较少量的再定时奥氏体，而（Si）含量较低。这种现象似乎是由于抑制了奥氏体相的碳富集而导致奥氏体难以在室温下保持的现象。 （5）因此，通过降低（Si）的含量来抑制残余奥氏体的量，从而可以提高屈服比，而无需进行任何其他热处理操作，从而提高了贝氏体从贝氏体转变过程中碳扩散的（Si）含量。 Si）内容。从节能和经济的角度出发，该方法被认为是最优选的。我们已经开发出了新的贝氏体微合金钢，从上述发现来看，这种贝氏体微合金钢提高了屈服比，并且这些钢被实际用作转向部件的微合金钢。的卡车。

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