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首页> 外文期刊>Materials Science and Engineering >Microstructural modifications and changes in mechanical properties during cyclic heat treatment of 0.16% carbon steel
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Microstructural modifications and changes in mechanical properties during cyclic heat treatment of 0.16% carbon steel

机译：0.16％碳钢循环热处理过程中的显微组织改性和力学性能变化

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摘要

In this work an annealed 0.16 vn% carbon steel was subjected to cyclic heat treatment process that consisted of repeated short-duration (6 min) holding at 910℃ (above Ac_3 temperature) followed by forced air cooling. A typical microstructural development, not so common for low carbon hypoeutectoid steel, was observed. The main features involved were: (ⅰ) a substantial grain refinement (mainly at initial stage), (ⅱ) generation of dislocations (at initial stage) and its annihilation (at later stage) and (ⅲ) generation of grain boundary network of cementite and cementite cluster owing to divorced eutectoidal reaction. In low carbon steel, the presence of large proportion of grain boundary areas promoted grain boundary diffusion of carbon during short-duration holding. This phenomenon finally led to the generation of grain boundary cementite network and cluster through divorced eutectoidal reaction. Unlike high carbon steel, the contribution of divorced eutectoidal reaction to spheroidization was not so significant For higher cycles (5-8 cycles) substantial presence of grain boundary cementite and cementite cluster deteriorated the strength property. However, quite a high strength (UTS - 455 MPa) was achieved for this low carbon steel with two cycles of heat treatment due to fine ferrite grain size, high dislocation density and adequate proportion of fine lamellar pearlite in the microstructure.
机译：在这项工作中，对退火过的0.16 vn％的碳钢进行了循环热处理工艺，该工艺包括在910℃（高于Ac_3温度）下重复短时间（6分钟），然后进行强制空气冷却。观察到典型的显微组织发展，这对于低碳亚共析钢不常见。涉及的主要特征是：（ⅰ）大量晶粒细化（主要在初期），（ⅱ）位错的产生（在初期）和and没（在后期），以及（ⅲ）生成渗碳体的晶界网络和离析的共析反应导致渗碳体团簇。在低碳钢中，大比例的晶界区域的存在促进了短时保持过程中碳的晶界扩散。这种现象最终导致通过离析的共析反应生成晶界渗碳体网络和团簇。与高碳钢不同，离析共析反应对球化作用的贡献并不显着。对于更高的循环（5-8个循环），晶界渗碳体和渗碳体簇的大量存在会降低强度性能。但是，由于这种微细的铁素体晶粒尺寸，高的位错密度和微细的层状珠光体的适当比例，经过两次热处理后，这种低碳钢获得了很高的强度（UTS-455 MPa）。

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