共查询到20条相似文献,搜索用时 13 毫秒
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采用光学显微镜、透射电子显微镜(TEM)、EDS能谱分析仪和拉伸冲击试验机,研究了终轧温度对TMCP(thermo-mechanical controlled processing)低合金铌钛贝氏体钢组织和性能的影响。结果表明:随着终轧温度的降低,强度和韧性先升高后降低。终轧温度为815 ℃时,由于冷却前温度已降低到奥氏体-铁素体两相区,在晶界形成大量先共析铁素体,造成了强度和韧性的下降。终轧温度为870 ℃时,得到细小的板条贝氏体+少量的马氏体组织,在贝氏体板条上有30~50 nm的Nb、Ti析出相弥散分布,获得了最优异的性能,其屈服强度为805 MPa,抗拉强度为1 005 MPa,-20 ℃冲击功的平均值为197 J。 相似文献
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铜含量对低碳HSLA钢力学性能的影响 总被引:3,自引:1,他引:2
Cu能显著提高低碳HSLA钢的强度;时效状态下,添加1%以上的铜可使钢的屈服强度提高150 ̄200MPa,抗拉强度提高160 ̄170MPa,但钢的韧性有所降低。当提高时效温度时,不同Cu含量钢的强韧性差异减小。 相似文献
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采用扫描电子显微镜(SEM), X-射线衍射仪(XRD)、拉伸试验机等研究了φ5.5 mm 0.73%C 72A帘线钢盘条原精轧工艺[精轧≥930℃,吐丝(870±10) ℃]和改进工艺[精轧≥950℃,吐丝(900±10) ℃]对其组织、织构和力学性能的影响。结果表明,精轧和吐丝温度分别提高20℃和30℃后,该钢珠光体片层间距由144 nm降至133 nm,抗拉强度和塑性略有增加,而盘条轴向{111}织构强度下降,氧化皮剥落率由1.66 kg/t提高到2.67kg/t,有利于提高帘线钢的拉拔性能。 相似文献
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《钢铁研究学报(英文版)》2011,(Z1):625-628
The correlation among finish rolling temperature (FRT),microstructure and mechanical property of the high grade pipeline steel was investigated in this study.The microstructure of the steels with different finish rolling temperatures was observed with scanning electronic microscope (SEM) and transmission electronic microscope (TEM).The martensite/austenite (M/A) islands distribution was fixed by colour metallography,and the mechanical properties of the steels were tested with quasi-static tensile testing machine.The result shows that the fraction of M/A island increased with the finish rolling temperature decreasing,and when the finish rolling temperature is 800℃,the mechanical properties are the best. 相似文献
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轴承钢GCr15棒材产品低温精轧的研究 总被引:2,自引:0,他引:2
采用国外引进的可实现低温精轧的生产线,对轴承钢GCr15棒材产品进行了低温精轧,通过低温精轧降低了网状碳化物级别,减少了球化退火时间。研究得到了低温精轧轧制GCr15时以控制网状碳化物级别为目标的轧制温度范围为750~840℃,轧后冷却温度范围为600~680℃,同时也研究得到了低温精轧轧制GCr15时以控制网状碳化物级别及减少球化退火时间为目标的轧制温度范围为750~800℃,轧后冷却温度范围为600~680℃。通过该研究网状碳化物级别达到了2级以下,球化退火时间由原18h减少到了11h。 相似文献
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N. Venkateswara Rao G. Madhusudhan Reddy S. Nagarjuna 《Transactions of the Indian Institute of Metals》2014,67(1):67-77
The present work pertains to the study of microstructure and mechanical properties of explosively clad high strength low alloy steel with commercially pure titanium. The clad interface was characterized by metallography, hardness, shear bond strength and bend tests. The present study revealed that the clad interface was wavy in nature. Shear bond strength of clad interface was in between substrate and clad material. The three point bend tests were conducted on clad joint in such a way that cladding layer was subjected to tension and compression which have not shown any cracks at the interface. The mechanism and reasons for the observed behaviour have been discussed correlating microstructure, mechanical properties, fracture features and diffusion across the interface. 相似文献
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成分(%)为0.02C-1.55Mn-0.62Ni-0.53Cu-0.003 5 B-0.055V-0.019Ti-0.028Nb的超低碳贝氏体钢ULCB570,由试验室50 kg真空感应炉冶炼,锻80 mm厚板坯,经开轧温度1 150℃,终轧温度900℃空冷轧成25mm厚板材,并用Thermecmaster-Z热模拟试验机测试了该钢的形变奥氏体连续冷却转变曲线。结果表明,该钢形变后在0.130℃/s冷却下的组织为贝氏体-铁素体+第2相或析出物,轧态抗张强度σb为595 MPa,冲击韧性AKV为180 J,轧态+600℃时效时的σb增加至610 MPa,AKV增加至202 J,达到570 MPa级钢板的性能要求。 相似文献
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Six hot compression tests are conducted using the Gleeble3500 thermomechanical simulator to investigate the microstructural evolution and precipitation behavior in low-C–Mn V-microalloyed steel. The specimens are subjected to hot isothermal compression deformation of 87%. The optical microscopy and transmission electron microscopy using carbon extraction replica method are used to characterize the microstructures and precipitation after the simulated thermomechanical controlled process and coiling. The results indicate that increasing the finish rolling temperature benefits the refinement of ferrite grains but has little influence on the refinement of the precipitates. It is also observed that lower coiling temperatures (CTs) promote the formation of fine precipitates. When the CT is 500 °C, the average precipitate size is found to be 86 nm. Furthermore, it is found that the CT significantly influences the nucleation sites of the precipitates inter alia, the matrix, interphase, grain boundaries, and dislocations. As expected, at higher CTs, nucleation is predominantly on the defects rather than the matrix. 相似文献
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Metallurgist - The effect of heating temperature and deformation during hot rolling on the microstructure and mechanical properties of steel grade 07Kh12NMFB... 相似文献
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《钢铁研究学报(英文版)》2011,(Z1):312-315
Grain refinement improves not only strength but also toughness.Small reaustenized grains were discovered to form along the grain boundaries and lath boundaries in an as rolled high-strength low-alloy (HSLA) steel when heated to double phase region.The number and size of the small reaustenized grains were revealed to depend mainly on temperature in the range of 700 to 760℃.These small reaustenized grains were deduced to form by consuming precipitates.The mechanical property tests showed that they resulted in slight changes to tensile properties.However,the sample heated at 740℃ produced a peak Charpy V-notch (CVN) impact energy of 248J when tested at-30℃.Fractography showed that the facture surface of the 740℃ heated impact sample exhibited the smallest brittle zone away from the notch root and a large dimple zone lay ahead of the notch tip,which demonstrated the highest toughness. 相似文献
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利用环境扫描电子显微镜对X80管线钢(/%:0.043C、0.25Si、1.86Mn、0.085Nb、0.001 Ti、0.028Al、0.002 7N)的显微组织进行了观察,并借助于X射线衍射仪和电子背散射衍射技术,分析了管线钢组织与晶粒织构取向的特点。结果表明,{112}〈110〉、{110}〈110〉取向增加、小角度晶界比率提高,使管线钢的落锤撕裂面积增大,韧性提高;降低终轧温度、提高冷却速度,能够得到较多的针状铁素体,对落锤撕裂性能是有利的。 相似文献
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0.153Ti-0.038Nb和0.080Ti-0.062Nb两种Ti-Nb微合金化低碳钢(/%:0.061~0.075C、0.22Si、1.76~1.77Mn、0.002~0.003S、0.006P、0.003Als、0.003 8~0.004 2N、0.004 0~0.004 5O)由50 kg真空感应炉冶炼,轧成10 mm板,终轧温度880℃,水冷至630℃。试验结果表明,两种Ti-Nb微合金化钢的析出物均为(Nb,Ti)(C,N)复合析出物;当Ti含量由0.080%增加至0.153%,同时Nb含量由0.062%降至0.038%时,钢屈服和抗拉强度分别从558 MPa和653 MPa提高至633 MPa和756 MPa,屈强比、伸长率和断面收缩率变化较小。表明,添加Ti代替部分Nb进行复合微合金化可提高钢材强度,降低生产成本。 相似文献
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Zr微合金化HSLA钢粗晶热影响区的组织和性能 总被引:1,自引:0,他引:1
用焊接热模拟法研究了Zr处理对 (%):≤ 0.18C-1.2~1.6Mn低合金高强度(HSLA)钢焊接粗晶热影响区(CGHAZ)组织和性能的影响。试验结果表明,Zr含量在0.01%~0.03%时,经过30~100kJ/cm线能量焊接热模拟后,CGHAZ的强度、塑性和-50℃冲击韧性都高于没有经过Zr处理的试验钢;Zr钢显微硬度(HV10)177~251,具有优良的焊接性。焊接线能量相同时,没有经过Zr处理试验钢CGHAZ的晶粒比Zr处理钢粗大;焊接线能量为 30kJ/cm时 ,各试验钢CGHAZ的组织以贝氏体为主 ,随着焊接线能量提高 ,CGHAZ中出现针状铁素体和少量珠光体。 相似文献