共查询到19条相似文献,搜索用时 78 毫秒
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低碳低合金贝氏体高强度钢热变形奥氏体的连续冷却转变 总被引:3,自引:0,他引:3
研究了一种Cr-Mn-Mo-B低碳低合金贝氏体钢热变形后奥氏体的连续冷却转变,获得了试验用钢热变形后奥氏体的连续冷却转变曲线,试验结果表明,本试验用钢不发生先共析铁素体析出的临界冷却速度为0.15℃/s冷却速度在0.15~1.00℃/s范围时可得到全部粒状贝氏体组织;随着冷却速度的降低;粒状贝氏体中的小岛尺寸增大,数目减少。 相似文献
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奥氏体状态对 Mn-Cr 齿轮钢连续冷却相变组织的影响 总被引:1,自引:0,他引:1
使用Cleeblel500热模拟试验机研究了成分(%)为:0.23C,0.74Mn,0.90Cr 齿轮钢奥氏体晶粒尺 寸和变形(真应变量0.4)对连续冷却相变组织的影响和连续转变冷却(CCT)曲线。实验结果表明,当齿轮钢 未变形时,获得完全多边形铁素体+珠光体混合组织的临界冷速为0.5~1℃/s,冷速较快时,中温相变产物 由贝氏体及针状铁素体组成;奥氏体变形时,多边形铁素体相变开始温度升高,获得完全多边形铁素体+珠光 体混合组织冷速增大,为1~2℃/s,中温相变产物没有出现贝氏体,只有针状铁素体。 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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Precisepredictionofferritegrainsize,dα,isofgreatimportanceinimprovingprocessingscheduleandmechanicalpropertiesofα+Porα+Bsteel... 相似文献
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The effect of compressive deformation of austenite on continuous cooling transformation microstructures for 22CrSH gear steel has been investigated using a Gleeble 1500 thermal simulator. The experimental results show that the deformation of austenite promotes the formation of proeutectoid ferrite and pearlite, and leads to the increase of critical cooling rate of proeutectoid ferrite plus pearlite microstructure. The grain boundary allotriomorphic ferrite occupies the austenite grain surfaces when the prior deformation takes place or the cooling rate is decreased, which causes a transition from bainite to acicular ferrite. The deformation enhances the stability of transformation from austenite to acicular ferrite, which results in an increase of M/A constituent. 相似文献
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利用热模拟技术(DIL805A热膨胀仪)和显微分析方法,对不同成分体系X100/X120高强度管线钢在连续冷却转变下的显微组织的变化规律进行了研究。研究结果表明,对于无B钢,随冷速增加,组织中依次出现多边形铁素体(PF)、粒状贝氏体(GB)、贝氏体铁素体(BF)和马氏体(M)。B元素的添加使得管线钢相变开始温度降低到500℃左右,抑制了多边形铁素体的形成,促进了贝氏体的形成。为了获得高级别管线钢X100的复相组织,无B钢的冷却速度应控制在20~30℃/s,而含B钢的冷速只需控制在5~15℃/s,简化了冷却工艺。 相似文献
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�����ɣ��Խݣ�����Ⱥ�����ˣ��ƽ 《钢铁研究学报》2013,25(8):28-31
The transformation behavior of Nb-V micro-alloyed low carbon austenite steel during continuous cooling was investigated through Gleeble-3800 themomechanical simulator and metallographic analysis. The experimental results show that the dynamic CCT diagrams shift to the left and upper compared with the static ones, the begin temperature of A????-Fe transformation is gradually lower with the increase of cooling rate. The high temperature deformation improves Ferrite and Pearlite transformation and decreases Ferrite transformation zone. When the cooling rate is lower, the deformation improves Bainite transformation; when the cooling rate is higher, the deformation restrains Bainite transformation. 相似文献
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Using methods of single-hit hot compression and stress relaxation after deformation on a Gleeble 1500D thermomechanical simulator, the curves of flow stress and stress relaxation, the microstructure and the recrystallization behavior of Nb-V-Ti high strength microalloyed low carbon pipeline steel were studied, and the influence of the thermomechanical treatment parameters on dynamic and static recrystallization of the steel was investigated. It was found that microalloying elements improved the deformation activation energy and produced a retardation of the recrystallization due to the solid solution and precipitation pinning. The deformation conditions such as deformation temperature, strain, and strain rate influenced the recrystallization kinetics and the microstructure respectively. Equations obtained can be used to valuate and predict the dynamic and static recrystallizations. 相似文献