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《钢铁研究学报(英文版)》2011,(Z1):388-392
The Nb-Ti microalloyed high strength IF steel sheet was used to study the effect of annealing temperature on the microstructures,mechanical properties and textures.The experimental results show that experimental steel is incomplete recrystallization at 750℃ annealing,but complete recrystallization from 780℃ to 870℃ under experimental conditions.When the annealing temperature was increased,the yield strength and tensile strength would gradually reduce,the plastic strain ratio and yield point elongation would gradually increase.The yield strength,tensile strength,elongation,the plastic strain ratio and the strain hardening exponent were approximate 300MPa,410MPa,36.5%,1.7 and 0.22 respectively under annealing temperature 810℃ to 840℃.When the annealing temperature was increased,the α-textures and γ-textures were gradually weakened,and the α-textures have a trend to {111} texture.Therefore,the suggestion of the optimal recrystallization annealing temperature is about 810℃ to 840℃ in industrial production. 相似文献
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In order to develop cold rolled Ti-microalloyed steel strips, the effects of annealing temperature on recrystallization behavior of experimental steel were researched by optical microscopy (OM), transmission electron microscopy (TEM) and Vickers hardness test. The annealing treatment could be divided into three distinct stages: recovery, recrystallization and grain growth. Recrystallization took place from 933 to 1033 K, during which a large number of recrystallized grains appear and hardness drops sharply. The morphology and size of TiN particles nearly remained unchanged at different stages of processing. With increasing annealing temperature, nanometer precipitates coarsened and the dislocation density was significantly reduced. In comparison with annealing time, annealing temperature was more crucial for recrystallization of cold rolled Ti-microalloyed steel. It could be concluded that the pinning force of nanometer particles on dislocations increased the recrystallization temperature. At higher annealing temperature, recrystallization took place because of precipitates coarsening caused by Ostwald ripening. 相似文献
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用连续退火模拟试验机,在实验室试制了冷轧高硅DP590,并通过扫描电镜、EBSD、透射电镜和力学性能测试研究了不同退火温度(735~835℃)对其组织和力学性能的影响。结果表明:退火温度对高硅双相钢强度和塑性有重要的影响,当退火温度为785℃时,材料获得良好的综合力学性能。不同温度退火后得到的组织均为铁素体和均匀分布在其晶界上的岛状马氏体;利用EBSD技术清晰地观察到离散分布于铁素体和马氏体晶界处的残余奥氏体。运用透射电镜观察到马氏体周围的位错线及位错团,这是双相钢连续屈服特性的重要保障。 相似文献
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采用极图与取向分布函数(ODF),并通过显微组织观察及显微硬度测试,研究分析了90%冷拉减面率的变形钽丝在1100℃、1250℃、1360℃、1500℃下退火过程中的再结晶行为,提出了拉拔钽丝的再结晶模型。研究发现:在低温火后钽丝发生了强烈的回复;在1360℃退火后再结晶基本完成,出现了均匀的等轴状晶粒,再结晶织构{110}<001>与变组织构{112}<110>之间存在27℃<110>的关系;在1500℃退火后钽丝中发生了二次再结晶,品粒变得粗大,并出现了一种与原再结晶织构{110}<001>呈27℃<110>关系的再结晶织构组分{441}<110>。钽丝的再结晶行为符合选择生长理论。 相似文献
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The effect of solution annealing temperature ranging from 950 to 1 200℃ on the microstructure and corrosion performance of duplex stainless steel(DSS)2204 were investigated.The proportion of the ferrite phase increased while the austenite phase decreased and the ferrite stabilizing elements diluted in the ferrite phase with the increase of annealing temperature.The critical pitting temperature(CPT)of specimens annealed at 1 000℃ was higher than those annealed at 950 ℃,whereas further increasing the annealing temperature to 1 200 ℃ decreased the CPT.The pitting initiation sites were observed in the austenite phase,at the boundary of ferrite/austenite phase and inside the ferrite phase for specimens annealed at 950,1 000℃ and exceeding 1 100℃,respectively.The evolution trend of the CPT and the pit initiation site were analyzed by the pitting resistance equivalent number. 相似文献
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采用射频磁控溅射法在Si(111)上制备出LaNiO3薄膜,并通过XRD、SEM等进行表征。结果表眀,LaNiO3薄膜在未退火状态下出现一定的择优取向,在空气中随着退火温度的增加,结晶性更好,出现钙钛矿型结构;900℃退火时出现杂相,LaNiO3发生分解导致薄膜表面形貌发生巨大变化。电阻率与结构中的氧空位有密切联系,退火温度增加,氧空位减少,电阻率减小。在700℃退火时可以得到1.59Ω·cm的最小电阻率。 相似文献
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研究了中间退火工艺参数(丝径、温度、速度)对W25Re合金丝材抗拉强度、组织及成品率的影响。有关结果表明,通过适当选取中间退火工艺参数,可改善W25Re合金丝材的加工性能,使合金坯料加工成D0.1mm细丝的成品率达60%,且断丝次数不超过3次。 相似文献
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利用MULTIPAS多功能连续退火模拟机对590MPa级别DP钢在不同过时效温度情况下进行模拟退火实验,探索过时效温度对DP钢性能及组织的影响,确立了双相钢过时效段的温度控制范围。通过实验结果指导本钢的生产实践,保证了冷轧双相钢的稳定生产,使产品具有最佳的力学性能。 相似文献
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介绍了电热罩式退火炉上采用SR-53型微机控温仪,自动控制硅钢退火工艺温度的过程及其在完善工艺制度,提高硅钢退火性能等方面的良好效果。 相似文献
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冷变形量及退火温度对钽板再结晶组织的影响 总被引:4,自引:0,他引:4
采用扫描电镜和金相显微镜对深冲后的钽壳进行了表面观察和金相组织分析,同时研究了不同轧制变形量和退火方式对钽再结晶晶粒大小的影响。研究结果表明:细化晶粒是保证深冲钽壳良好表面质量的重要措施,退火前增大冷轧变形量有助于晶粒细化,电子束熔炼生产的纯钽起始再结晶温度为800℃左右,90%变形后经850℃×40 min退火可以得到较细的晶粒,采用适当的高温短时退火可以细化晶粒。 相似文献
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连续退火过时效温度对热处理双相钢组织性能的影响 总被引:1,自引:0,他引:1
采用光亮连续退火模拟实验机研究了0.08C 1.7Mn 0.03Si钢在不同连续退火过时效温度下组织和性能的变化规律,并构造了各相在连续退火工艺期间的反应关系式。试验结果表明:过时效温度在450 ℃时,组织中的第二相主要为粒状贝氏体+马氏体,350 ℃时为板条状贝氏体+马氏体,250 ℃时为马氏体或M A岛;过时效温度降低,试验钢抗拉强度明显升高,屈服强度明显降低,而n值、值和杯突值变化不大;350 ℃过时效时,试验钢的伸长率有增高的趋势,因此调整第二相组分比例可能是提高试验钢塑性的有效手段。 相似文献
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通过XRD及Raman物相分析、SEM形貌观察和EDS成分分析等方法研究了硫化退火温度对金属三靶顺序溅射铜锌锡硫(CZTS)薄膜性能的影响。结果表明,在一定温度范围内(500~580℃),随着温度的升高薄膜的结晶性能有变好的趋势,形貌也得到了改善。当温度达到600℃时,CZTS薄膜会发生分解反应,该分解反应不但导致薄膜结晶性能及形貌恶化,也造成了锡元素的损失。580℃条件下获得的薄膜各项性能俱佳,是最适合本实验体系的退火温度。 相似文献