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控轧控冷工艺对低碳贝氏体钢组织性能的影响 总被引:5,自引:0,他引:5
通过在中厚板轧机上进行的控轧控冷工艺试验,研究了不同控轧控冷条件对低碳贝氏体钢DB685组织和性能的影响,得出增大变形量可得到细小均匀的晶粒组织,使钢材的强韧性提高;增大轧后冷却速度能有效地提高钢板强度。并提出了工业生产DB685钢的控轧控冷工艺参数:终轧温度≤850℃,轧后冷却速度≥5℃/s,终冷温度≤650℃。 相似文献
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对贝氏体耐磨钢进行控轧控冷+回火工艺,探究不同温度回火后贝氏体耐磨钢的组织演变和性能。结果表明,经控轧控冷工艺和200℃回火后,试验钢获得较为理想的无碳化物贝氏体/马氏体复相组织,组织中包含8.7%(体积分数)的残留奥氏体。该工艺下钢板获得较好的强韧性匹配,屈服强度达到1172 MPa,抗拉强度达到1613 MPa,断后伸长率达到19.4%,-20℃冲击吸收能量为47 J,并可满足NM500级别的硬度要求。520℃回火后大量粗大碳化物析出,且残留奥氏体基本分解完毕,导致钢板强韧性下降。 相似文献
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为改进贝氏体钢的生产工艺,对贝氏体超高强钢进行了控轧+空冷(1#钢)、控轧+快冷(2#钢)试验,对轧后钢板组织性能进行了检测分析。结果表明,1#钢(空冷)的显微组织主要为板条贝氏体和铁素体;2#钢(快冷)的显微组织主要为板条马氏体;1#钢和2#钢的抗拉强度都在1 500 MPa以上,并具有良好的塑性、韧性,但1#钢的综合性能优于2#钢。 相似文献
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控轧控冷是先进轴承钢的重要生产工艺。利用Gleeble3500热模拟试验机对G20CrNi2MoA轴承钢进行了控制轧制和控制冷却的热模拟试验,分析了变形温度、变形程度和冷却速率对G20CrNi2MoA优质滚动轴承钢微观组织和硬度的影响。基于试验结果,确定了开轧温度900 ℃、变形量30%的条件进行轧制,终轧后以5 ℃/s的冷却速率冷却到650 ℃,再以2 ℃/s的冷却速率冷却至室温的控轧控冷工艺。该工艺可获得比原始组织更细小均匀的贝氏体组织,试验钢综合力学性能有所提高,抗拉强度提升180 MPa、屈服强度变化较小、硬度提升50HV,断后伸长率提升2%。 相似文献
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控轧控冷是先进轴承钢的重要生产工艺。利用Gleeble3500热模拟试验机对G20CrNi2MoA轴承钢进行了控制轧制和控制冷却的热模拟试验,分析了变形温度、变形程度和冷却速率对G20CrNi2MoA优质滚动轴承钢微观组织和硬度的影响。基于试验结果,确定了开轧温度900 ℃、变形量30%的条件进行轧制,终轧后以5 ℃/s的冷却速率冷却到650 ℃,再以2 ℃/s的冷却速率冷却至室温的控轧控冷工艺。该工艺可获得比原始组织更细小均匀的贝氏体组织,试验钢综合力学性能有所提高,抗拉强度提升180 MPa、屈服强度变化较小、硬度提升50HV,断后伸长率提升2%。 相似文献
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Controlled rolling, followed by accelerated cooling, was simulated by means of torsion tests. High-strength low-alloy (HSLA) low-carbon (0.08%) bainitic steel containing B, recently developed by the industry as a bainitic steel grade of the API X80 class, was examined. The influence of cooling rate and finish-cooling temperature on the microstructure and mechanical properties were studied. The final microstructure was predominantly bainitic. For a finish-cooling temperature of 400°C the microstructure consists of fine laths of bainitic ferrite with interlath MA constituent, and increase in the cooling rate leads to a continuous increase of the tensile and yield strengths of 158 and 183 MPa, respectively. The analysis of the results enabled the establishment of quantitative relationships between the accelerated cooling variables and the mechanical properties of steel. 相似文献
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《Science & Technology of Welding & Joining》2013,18(6):535-540
AbstractThe objective of the present study is to develop and evaluate novel weld repairs of bainitic rail steel defects, such as detail fracture, induced by in service loading. Slots were machined in the bainitic rail steel to simulate the removal of service defects. Multipass gas metal arc welding was used to fill and repair the slots. Three-point bend tests of the parent and welded steels revealed that the flexural weld efficiency was 75%. Fatigue crack propagation (FCP) tests were performed on specimens from the welded joints and compared with the parent materials to determine the mechanical integrity of the slot repairs. The fatigue lifetime and FCP kinetics were similar for the parent and slot welded bainitic steels, indicating similar resistance to FCP. The fatigue fracture surface morphology of the parent and welded bainitic rail steels both revealed mostly a ductile fracture mechanism in all the three FCP stages. 相似文献
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The phase transformation behaviors during continuous cooling of low-carbon boron steels with different vanadium contents were studied by means of dilatometric measurement and microstructure observation. The bainite transformation behavior is not noticeably altered when the vanadium content is 0.042 and 0.086 wt%, and these steels exhibit full bainitic microstructure even at a cooling rate of 5 °C/s. When vanadium content is increased to 0.18 wt%,ferrite is still present in the microstructure even at a cooling rate of 40 °C/s. Vickers hardness of the steels with 0.042 and0.086 wt% V is remarkably higher than that of the steel with 0.18 wt% V at a cooling rate higher than 10 °C/s, and the difference is increased with the increase in cooling rate. Moreover, the amount of coarse vanadium precipitates formed in austenite is increased with the increase in vanadium content. The optimum content of vanadium to obtain bainitic microstructure is 0.086 wt% in this experimental low-carbon boron steels. 相似文献
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用奥贝球铁代替20CrMnTi钢生产小四轮拖拉机减速齿轮具有成本低、质量稳定、节约原材料及易于推广应用等优点.本文详细论述了奥贝球铁齿轮的铸造与热处理工艺 相似文献
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低碳贝氏体钢渗碳工艺及在轿车齿轮上的应用 总被引:12,自引:1,他引:11
对低碳帐房底体钢的渗碳工艺、显微组织、力学性能、液火变形进行了研究。结果表明,此钢渗碳工艺性能良好,渗碳层组织理想,力学性能优良,采用渗碳气冷淬火 ,使轿车齿轮淬火变形比20CrMnTi钢的明显减小。 相似文献
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研究了不同热处理工艺下无碳化物贝氏体无缝钢管的显微组织和力学性能。结果表明,热轧态无碳化物贝氏体无缝钢管的组织粗大,强度较高,韧性很低。热轧+低温回火后韧性的提高幅度不大,仍然较低。热轧+正火+低温回火可以改善无碳化物贝氏体无缝钢管的韧性,但仍存在部分粗大的组织。热轧后先长时间高温回火(690 ℃×300 min),再正火和低温回火可以细化无碳化物贝氏体无缝钢管的组织,消除组织遗传性,大幅度提高韧性,冲击断裂特征由脆性断裂转变为韧性断裂。 相似文献
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利用电化学、金相、能谱等方法, 研究了低碳贝氏体钢在表面锈层受到不同程度的损伤后, 在含Cl-环境中的继续腐蚀行为. 实验发现, 低碳贝氏体钢和作为对比材料的低碳钢试样的表面锈层受损伤后, 在继续腐蚀过程中均能很快得到修复. 在损伤程度与继续腐蚀时间相同的条件下, 低碳贝氏体钢的锈层电阻与损伤修复率均高于低碳钢. 低碳贝氏体钢基体/锈层界面的断裂韧性高于锈层本身.在受外界作用时, 锈层不会沿基体/锈层界面彻底脱落从而在基体表面保存残留锈层. 残留锈层能明显促进新锈层在损伤部位的形成. 原有锈层与损伤部位新形成的锈层中Cu和Cr含量接近, 并与钢基体的含量相当. 相似文献