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首页> 外文期刊>ISIJ international >Effect of Tempering Temperature on the Microstructure and Hardness of a Super-bainitic Steel Containing Co and Al
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Effect of Tempering Temperature on the Microstructure and Hardness of a Super-bainitic Steel Containing Co and Al

机译：回火温度对含Co和Al的超贝氏体钢组织和硬度的影响

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摘要

The effect of tempering temperature, within the range of 400 to 700°C, on the microstructure and hardness of two super-bainitic steels, one as the control parent sample and the other with added Co & Al was investigated. Post-tempering examinations of the super-bainitic samples showed that low temperature tempering cycles (400–500°C) resulted in carbides formation, and some increases in the hardness possibly due to precipitation strengthening in the Co & Al contained steel. Once the tempering temperature increased to 600°C, the hardness plummeted in both steels due to the concurrent coarsening of the bainitic ferrite plates and more precipitation of carbides. At the higher tempering temperature of 700°C, further reduction in the hardness occurred because of the accelerated recovery of ferrite and spheroidization of carbides. This work clearly showed that the super-bainitic steel containing Co & Al had a superior tempering resistance particularly at low tempering temperatures (<500°C) due to reduced carbide precipitation in the presence of Co & Al.
机译：研究了400-700℃范围内的回火温度对两种超级贝氏体钢的显微组织和硬度的影响，一种是作为对照母体样品，另一种是添加了Co和Al。对超贝氏体样品进行回火检查后发现，低温回火循环（400–500°C）导致形成碳化物，并且可能由于含Co＆Al的钢中的析出强化而使硬度有所提高。一旦回火温度升至600°C，由于贝氏体铁素体板同时粗化和碳化物更多析出，两种钢的硬度均下降。在700℃的较高回火温度下，由于铁素体的加速回收和碳化物的球化作用，硬度进一步降低。这项工作清楚地表明，由于在Co＆Al的存在下碳化物的沉淀减少，特别是在低回火温度（<500°C）下，含Co＆Al的超贝氏体钢具有优异的回火抗性。

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