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采用正交实验模拟了不同加热制度下的LX72A钢的表面脱碳实验,结合光学显微观察测定脱碳层深度,研究了预热温度、预热时间、均热温度和均热时间对LX72A钢表面脱碳的影响。在Gleeble-3500热模拟试验机上模拟分析了不同变形温度和吐丝温度对LX72A钢的组织性能影响。结果表明,均热温度对表面脱碳的影响远大于其他因素。变形温度愈高,索氏体化率越高,片层间距愈小,硬度增加。提高吐丝温度有利于索氏体化率的增高以及片层间距的减小,但是当超过900℃,生成了强度更高的屈氏体。
The surface decarburization experiments of LX72A steel under different heating regimes were simulated by orthogonal experiment. The depth of decarburization layer was determined by optical microscopy. The effects of preheating temperature, preheating time, soaking temperature and soaking time on the surface properties of LX72A steel Effect of surface decarburization. The effect of different deformation temperature and spinning temperature on the microstructure and properties of LX72A steel was simulated on a Gleeble-3500 thermal simulator. The results show that the effect of soaking temperature on the surface decarburization is far greater than other factors. The higher the deformation temperature, the higher the sorbitolization rate, the smaller the spacing between layers and the higher the hardness. Increasing the temperature of silking is conducive to the increase of sorbite rate and the decrease of the interlamellar spacing, but when it exceeds 900 ℃, higher strength troostite is formed.