共查询到20条相似文献,搜索用时 62 毫秒
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通过在中厚板轧机上对WSM30A进行控轧控冷工业试验,研究不同控轧控冷工艺对其组织和性能的影响。结果表明,采取合理的控制轧制方式及轧后冷却速度,可以有效提高钢板的硬度和厚度方向硬度均匀性,并得出WSM30A在现有装备能力条件下的最佳组织形态。 相似文献
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基于柳钢中厚板生产线超快速冷却改造项目,采用低碳、适当微合金化的成分设计和3种不同控轧控冷工艺,进行X70级管线钢的控轧控冷工艺开发试验。结果表明:在轧制温度相同的情况下,随着返红温度的降低,X70级管线钢的显微组织更加有利于针状铁素体的形成,钢板落锤撕裂韧性逐渐提高,具备最佳的综合力学性能,满足相关技术标准要求。 相似文献
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DU Lin-xiu ZHANG Zhong-ping SHE Guang-fu LIU Xiang-hua WANG Guo-dong 《钢铁研究学报(英文版)》2006,13(3):31-35,50
The dynamic recrystallization and static recrystallization in a low carbon steel were investigated through single-pass and double-pass experiments. The results indicate that as the deformation temperature increases and the strain rate decreases, the shape of the stress-strain curve is changed from dynamic recovery shape to dynamic recrystallization shape. The austenite could not recrystallize within a few seconds after deformation at temperature below 900 ℃. According to the change in microstructure during deformation, the controlled rolling of low carbon steel can be divided into four stages: dynamic recrystallization, dynamic recovery, strain-induced ferrite transformation, and rolling in two-phase region. According to the microstructure after deformation, the controlled rolling of low carbon steel can be divided into five regions: non-recrystallized austenite, partly-recrystallized austenite, fully-recrystallized austenite, austenite to ferrite transformation, and dual phase. 相似文献
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控轧控冷工艺对低碳铌微合金钢组织和性能的影响 总被引:5,自引:0,他引:5
用Gleeble-1500热模拟实验机测定了低碳铌微合金钢变形后的连续冷却转变曲线(CCT曲线),并在实验室对该实验钢采用不同的工艺进行了控制轧制和控制冷却的实验.研究了工艺参数对实验钢力学性能和微观组织的影响,分析了低碳铌微合金钢的强韧化机制.热模拟实验结果表明,实验钢在较宽的冷却速度范围(0.5~30 ℃/s)内可以获得贝氏体组织.控轧控冷的实验结果表明,实验钢的组织主要为铁素体和贝氏体.随着终轧温度的降低,组织得到细化,强度提高,但屈强比也随之增加;降低卷取温度使组织中的贝氏体含量略有增加,强度有所提高.初步探讨了贝氏体对实验钢性能的影响,为制定合适的生产工艺制度提供了依据. 相似文献
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In the present study, the phase transformation behaviour of 51CrV4 steel was investigated both in an actual flange forming process and under idealized isothermal bainitic transformation conditions. The results demonstrated that superimposed external stresses have only a minor effect on the kinetics of the phase transformation, whereas strains resulting from transformation plasticity were significant. Transmission electron microscopy revealed a preferential alignment of the bainite with respect to the external loading direction. This selection of favourably oriented variants in turn causes macroscopic strains. Understanding and minimizing these strains are a key factor in designing functionally graded components with minimum distortion. 相似文献
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许多钢厂的经验表明 ,在大多数情况下 ,添加一定量的 Ti可以提高高强度低合金钢的韧性 ,Ti N(氮化钛 )技术是在铝镇静钢中加入约0 .0 0 8%~ 0 .0 2 %的 Ti,把 Ti含量控制在这个范围内是为了确保在过热钢液中 Ti和 N结合凝固后析出细小的 Ti N粒子 ,在 Ti N处理的钢中 ,通常将氮含量控制在使 Ti/N之比小于 3.4∶ 1 (按化学计量法计算 ) ,并且氮含量应小于 0 .0 1 2 % ,使粗大的 Ti N颗粒的形成机率降到最低。在 Nb钢或 Nb- V钢板材中 ,细小的 Ti N微粒弥散可达到一些冶金好处。例如 ,Ti N粒子可细化钢的铸态组织 ,去除固溶体中的氮… 相似文献
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低碳490MPa级铆螺钢控轧控冷的研究 总被引:2,自引:0,他引:2
通过控轧控冷试验,研究了不同工艺参数对ML15钢力学性能的影响.结果表明,由于应变诱导铁素体相变,铁素体晶粒细化,低温轧制较常规轧制后快速冷却可以获得更好的综合力学性能;常规轧制后快速冷却要优于低温轧制后慢冷试样的力学性能;终冷温度越低,珠光体片间距越细,强度和塑性越好;低碳铆螺钢采用控轧控冷不经热处理抗拉强度达到490 MPa级别,其力学性能远优于常规轧制后不控冷的同样试样. 相似文献