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采用热膨胀法和金相法,通过Gleeble-1500热模拟试验机测定C-Mn-Si系低碳(/%:0.11C、1.15Si、1.85Mn、0.032Al、0.003 Ti、0.002 4N)和中碳(/%:0.35C、1.11Si、1.82Mn、0.041Al、0.002 Ti、0.004 2N)贝氏体钢在0.5~30℃/s的冷却速度下连续冷却时的膨胀曲线,确定相变点,并结合显微组织,借助Origin软件分别绘制出两种钢的连续冷却转变(CCT)曲线。结果表明,0.11%C钢当冷却速度≤1℃/s时获得铁素体+贝氏体+马氏体组织,冷却速度≥2℃/s时为贝氏体+马氏体组织,0.35%C钢冷却速度≥0.5℃/s即可获得贝氏体+马氏体组织;随碳含量增加,贝氏体和马氏体转变温度均降低。 相似文献
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应用GLeeble3800热模拟实验机分别做Q345E连铸坯心部与1/4处的临界转变温度测定,以及连续冷却转变曲线(CCT曲线)的对比试验,同时结合心部与1/4处化学成分分析、OPA金属原位成分偏析分析、金相检验、扫描电镜等方法对比分析,研究Q345E钢的相变规律,分析因Q345E连铸坯心部与1/4处偏析差异对贝氏体组织转变的影响。研究指出Q345E连铸坯的中心成分偏析推迟了珠光体转变,使连续冷却转变CCT曲线向下方移动;为减小偏析对轧后相变组织的影响,Q345E板材轧后冷速控制在3℃/s以内。 相似文献
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对一种新型中高碳贝氏体钢的组织,转为动力学和耐磨性进行了研究,中高碳贝氏体钢空冷后的组织为贝氏体,马氏体,碳化物和残留奥氏体,组织细小均匀,大截面实物硬度测定和组织观察表明,截面上具有高硬度,并组织分布均匀,中高碳贝氏体钢具有高的耐磨性。 相似文献
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10MnMoNiNb钢形变奥氏体连续冷却相变规律和显微组织 总被引:3,自引:0,他引:3
在Gleeble1500热模拟机上,利用热膨胀法建立了10MnMoNiNb钢在800℃变形50%后的连续冷却相变曲线(动态CCT曲线),并采用光学金相和TEM方法分析了在不同冷速条件下,形变奥氏体的相变产物。结果表明,钢的相变组织主要由冷速决定,快冷显著抑制先共析铁素体相变,中温相变产物为贝氏体组织,其中贝氏体铁素体为针状铁素体和粒状铁素体,均含有较高密度的位错和M/A岛状组织,并且在中温转变时无明显的碳化物生成。 相似文献
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The effects of deformation temperature and strain on bainite transformation of low carbon steel and boroncontaining steel were investigated under continuous cooling conditions by means of dilatometric measurement and microstructure observation.The results show that with decreasing the deformation temperature from 1 000to 800 ℃and increasing strains,bainite start temperature for boron-containing low carbon steel increases,whereas it decreases for low carbon steel under the same condition.The bainite microstructures are easily obtained for boron-containing steel deformed at different temperatures and different strains compared with plain low carbon steel.With increasing the continuous cooling rate,the bainite start temperature under deformed condition is about 20 ℃ higher than that under undeformed condition for boron-containing steel,but it changes slightly when the cooling rate is 20℃/s or more. 相似文献
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利用MMS-200热模拟试验机测定了07MnNiMoVDR钢的动态CCT曲线,研究了07MnNiMoVDR钢奥氏体连续冷却时的相变行为规律和显微组织。结果表明:随着冷却速度的增大,其组织由铁素体+珠光体逐渐向贝氏体转变;随冷却速度不同,在CCT图中存在两个相变区,即低冷速的先共析铁素体+珠光体相变区、中冷速的贝氏体相变区。 相似文献
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YI Hai-long DU Lin-xiu WANG Guo-dong LIU Xiang-hua 《钢铁研究学报(英文版)》2006,13(3):36-39,67
Utilizing Gleeble-1500 thermomechanical simulator, the influences of hot deformation parameters on continuous cooling bainite transformation in Nb-microalloyed low carbon steel were investigated. The results indicate that bainite starting temperature decreases with raising cooling rate and increases with increasing deformation temperature. Deformation has an accelerative effect on the bainite transformation when the specimens are deformed at 950 ℃. When the deformation temperature increases, the effect of deformation on bainite starting temperature is weakened. The amount of bainite is influenced by strain, cooling rate, and deformation temperature. When the specimens are deformed below 900 ℃, equiaxed ferrites are promoted and the bainite transformation is suppressed. 相似文献
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