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Effect of intercritical heat treatment on the microstructure and mechanical properties of an abrasion resistant heavy steel plate NM400

机译：跨临界热处理对耐磨重板微观结构和力学性能的影响

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A group of intercritical quenching (Q') tests was carried out on a HB400 grade abrasion resistant heavy steel plate NM400 by heating to different temperatures ranged from 750°C to 820°C.The result shows that the initial microstructure,before Q’,has a great effect on the final microstructure and mechanical properties.The hardness of samples with two initial microstructures,i.e.martensite and bainite,is almost the same,but the toughness of the former is much higher than that of the latter,after the Q'+T (tempering) process.Also,the fracture morphology of the Q'+T treated sample starting with a bainite microstructure shows a cleavage surface,while the one with martensite shows a mixture of dimple and cleavage.For the Q (quenching)+Q'+T process,with the increase of Q' temperature from 750°C to 820°C,the volume fraction of martensite increases while that of ferrite decreases,the microstructure turns finer,the hardness and toughness increase first and then decrease,attaining their peak values at 800 and 780°C,respectively.
机译：通过加热到750℃至820℃的不同温度，在Hb400级耐磨重型钢板NM400上进行一组跨临界淬火（Q'）试验。结果表明Q'之前的初始微观结构显示，对最终的微观结构和机械性能有很大的效果。用两个初始微观结构，Iemartensite和贝氏体的样品硬度几乎相同，但是前者的韧性远高于后者之后的韧性+ T（回火）过程。，Q'+ T处理样品的骨折形态以贝氏体微观结构起出显示裂解表面，而马氏体的裂缝表面显示凹坑和裂解的混合物。对于Q（淬火）+ Q'+ T处理，随着750°C的Q'温度的增加，马氏体的体积分数随着铁氧体的增加而增加，微观结构变细，硬度和韧性先增加，然后减少，达到他们的峰值价值S分别在800和780°C。

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