共查询到18条相似文献,搜索用时 218 毫秒
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基于动态大压下的510MPa级超细晶粒钢的组织及性能 总被引:1,自引:1,他引:0
基于动态大压下方法在1450热连轧机上生产出了510MPa强度级别超细晶粒热轧钢板。结果表明,通过基于动态大压下的热轧工艺,可以使Q235碳素钢的铁素体晶粒细化到4~6μm,可获得屈服强度为400MPa以上、抗拉强度510MPa以上强度级别的超细晶粒热轧钢板。超细晶粒热轧钢板的显微组织为铁素体和珠光体,铁素体晶粒多为细小均匀的等轴铁素体,铁素体晶粒内部及晶界位错密度较高,珠光体中的渗碳体大多以短棒状或颗粒状渗碳体存在。与用常规热轧工艺生产的Q235热轧钢板相比,基于动态大压下工艺生产的超细晶粒热轧钢板具有较高的强度和良好的韧性。 相似文献
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CSP生产低碳钢的组织演变和析出物研究 总被引:10,自引:0,他引:10
为了阐明EAF-LF-CSP工艺生产的低碳钢组织细化机理,在薄板坯和不同道次变形后的同一轧件上取样,利用金相、SEM、TEM、XEDS等技术研究了连轧过程中显微组织演变和钢中第二相析出物.结果表明:与普通连铸板坯相比薄板坯的凝固组织更加细小;随轧制道次增加,薄板坯表面和心部的组织差异逐渐减小,轧后室温组织细化;CSP生产的低碳钢中存在大量纳米尺寸的氧化物和硫化物,起到细化晶粒的作用.CSP生产中采用快速冷却和凝固工艺、单道次大压下连轧工艺和层流冷却工艺,是成品组织细化的主要原因. 相似文献
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通过不同的加工工艺制备具有不同晶粒尺寸和织构的AZ31镁合金板材,通过室温埃里克森试验研究了工艺因素对提高镁合金板材室温成形性能的影响。结果表明:增大晶粒尺寸,减弱基面织构,可以改善镁合金轧板在变形过程中产生的在轧制方向的硬取向,增大镁合金轧板的延伸率,从而提高镁合金室温成形性能;用异步轧制工艺(轧制和退火温度为400℃、异速比为1.5)制备的试样晶粒尺寸增大到20μm、(0002)极图最大极密度仅为2,室温杯突实验测得IE值达到了5.71,显著提高了材料室温成形性能。 相似文献
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目的 研究锻造和轧制两种不同加工成形方法对银靶微观组织的影响,解决纯银靶材内部晶粒粗大、分布不均匀的问题。方法 采用锻造和轧制方法分别对纯银靶材铸锭进行加工,通过对微观组织的观察和测试分析,研究两种不同加工方法对银靶微观组织的影响。结果 锻造加工的纯银靶材致密性更好;轧制加工的纯银靶材在冒口处存在大量缺陷。锻造加工的纯银靶材晶粒细小且分布均匀;轧制加工的纯银靶材晶粒较粗大、分布均匀性差,存在部分粗大晶粒。锻造加工的纯银靶材硬度值(73HV0.05)明显高于轧制加工的纯银靶材(55HV0.05)。结论 在晶粒细化及分布均匀性方面,锻造比轧制加工纯银靶材更具优势。 相似文献
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CSP热轧1.0mm超薄规格低碳钢板的组织及性能 总被引:2,自引:0,他引:2
采用光学显微镜、扫描电镜和拉伸实验等方法研究了CSP线轧制工艺与薄规格低碳钢板显微组织、力学性能特征之间的关系.显微组织观察和力学性能实测结果表明:CSP线生产的低碳钢连铸坯铸态组织比较均匀,靠近表面层的枝晶宽度与心部区域差别很小,皆为较细的树枝晶,枝晶宽度在几微米至30μm之间;成品1.0mm低碳钢薄板的组织很细,约为5μm,但轧向与横向组织中的铁素体晶粒形貌和尺寸存在差异;由于晶粒组织细小且钢中有害元素、夹杂物的含量低,故板的强度和延伸率高. 相似文献
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利用X射线晶面衍射分析和扫描电镜观察手段,分析了Bi系超导带材在轧前后以及热处理前后的晶粒取向性。实验结果表明轧制工艺导致了有利于超导材料电学性能的晶粒取向性分布,超导晶粒的片平面即晶面沿轧制平面作一致排列,这种取向性在热处理中得到了保留和加强。 相似文献
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本工作旨在探讨超薄取向硅钢组织及织构与磁性能的关系,并从加工工艺角度揭示如何减少不利于磁性能的组织和织构的产生。利用电子背散射衍射(EBSD)技术和X射线衍射(XRD)技术对两种磁性能不同的商业超薄取向硅钢带材的显微组织和织构进行对比分析,结果发现,二者组织、织构差异均比较明显。磁性能差的带材样品的组织尺寸不一,均匀性较差,η线织构(〈100〉//RD)所占比例偏低,非η线取向晶粒所占比例高且晶粒尺寸大,其取向特征主要表现为{210}〈001〉、{411}〈148〉及{111}〈110〉。这些不利组织的产生可能与轧制、退火工艺控制不当有关。因此,晶粒尺寸及η线取向晶粒所占比例的不同是造成两种带材性能差异的主要原因,在高性能取向硅钢超薄带材制备过程中,应精准控制轧制、退火制度等相关工艺,以避免非η线取向晶粒形成、长大。 相似文献
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This paper aims at the problem of high performance manufacturing of large 2A14 Al-alloy cylindrical components for aerospace applications. A warm rolling process was put forward to substantially refine the grains and secondary phases of 2A14 Al alloys. The results indicated that compared with hot rolling, warm rolling was easier to implement to form abundant subgrains and fully crushed the coarse particles. Coarse second phases dissolved and the precipitated T phases (AlCuMn) hindered the migration of grain boundaries and restrained grain growth during the heat treatment.The tensile strength, yield strength and elongation of the 2A14 aluminium alloy were significantly increased by 59?MPa (an increase of 14%), 71?MPa (an increase of 21%), 4% (an increase of 67%), respectively. 相似文献
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通过热挤压复合的方式将AZ91合金引入至SiCP增强镁合金(AZ91)(SiCP/AZ91)复合材料中,制备出厚度为2 mm的AZ91-(SiCP/AZ91)复合板,研究了热轧对其显微组织和力学性能的影响规律。研究结果表明:AZ91的引入显著提高了SiCP/AZ91的轧制成形能力。与AZ91层相比,SiCP/AZ91层内晶粒尺寸小,硬度高。随轧制压下量的增加,AZ91-(SiCP/AZ91)复合板晶粒尺寸变大,析出相数量减少且尺寸增大,导致硬度呈现下降的趋势。与挤压态AZ91-(SiCP/AZ91)复合板相比,当压下量为50%时,轧制态AZ91-(SiCP/AZ91)复合板屈服强度由272 MPa提高至341 MPa,抗拉强度由353 MPa提高至404 MPa。在拉伸过程中,因SiCP与基体界面脱黏导致裂纹优先在SiCP/AZ91层内萌生和扩展,AZ91层对微裂纹扩展具有一定的阻碍作用。 相似文献
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ABSTRACTIn the present study, grain refinement of Fe–Si–Mn–Nb–B steel was achieved by high reduction hot rolling. Through the following ultra-fast cooling (UFC) and relaxation process, martensite-ferrite complexes with soft phase embedded in the hard phase were prepared. Extremely tiny ferrite grains significantly increased the toughness of the test steel, a large number of big-angle grain boundaries existing in fine martensite lath bundles effectively improved the strength and the strain hardening ability of the investigated material. The test steel with a relaxation time of 6?s shows the best comprehensive performance with a tensile strength of 1473?MPa, an elongation of 15.0%, a low yield ratio of 0.72 and a product of strength and elongation (PSE) of 22.10?GPa%. 相似文献
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The grain morphology, nano-oxide particles and mechanical properties of oxide dispersion strengthened (ODS)-316L austenitic steel synthesized by electron beam selective melting (EBSM) technique with different post-working processes, were explored in this study. The ODS-316L austenitic steel with superfine nano-sized oxide particles of 30–40 nm exhibits good tensile strength (412 MPa) and large total elongation (about 51%) due to the pinning effect of uniform distributed oxide particles on dislocations. After hot rolling, the specimen exhibits a higher tensile strength of 482 MPa, but the elongation decreases to 31.8% owing to the introduction of high-density dislocations. The subsequent heat treatment eliminates the grain defects induced by hot rolling and increases the randomly orientated grains, which further improves the strength and ductility of EBSM ODS-316L steel. 相似文献
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《Materials Science & Technology》2013,29(10):1079-1093
AbstractOver recent years, new interstitial free (IF) steel grades containing controlled low levels of carbon and nitrogen have been adopted to fabricate car body panels. The processing and properties of these steels are reviewed. They can provide very high levels of formability, as indicated by width to thickness strain ratios during forming r of 1.8 (r values of traditional aluminium killed steels rarely exceed 1.8). Typically total interstitial contents are in the region <0.0030 wt-%C and <0.0040 wt-%N. Elimination of these solutes damaging to formability is achieved through careful control of the melt chemistry during steelmaking and by the hyperstoichiometric addition of titanium and/or niobium to react with carbon and nitrogen to form precipitates. Precipitation control during hot mill processing is instrumental in determining the grain size of the hot rolled material, which must be as small as possible, and grain size in the final cold rolled and annealed product, which must be optimised for formability. Control of crystallographic texture is also fundamental in producing exceptional deep drawability. Subsequent casting, rolling, and annealing operations must also be controlled to optimise the development of preferred precipitation and texture. The chemistry is designed such that under equilibrium conditions IF steel should contain no carbon or nitrogen in solid solution. Hot rolling, however, is a process in which equilibrium is not attained, and for this reason it is desirable for the removal of carbon and nitrogen to begin early in the hot rolling process. The most favourable removal mechanism in this respect is the precipitation of titanium carbosulphide (titanium carbide and niobium carbide also proliferate, but precipitate out at lower temperatures). Titanium carbosulphide formation is favoured when the slab reheat temperature is <1200°C, and when the C/S ratio approaches stoichiometric. Optimum finishing temperatures are close to the Ar 3 temperature but practically it is advisable to increase the finishing temperature by 20–30 K above Ar 3 to avoid the risk of ferritic rolling taking place at the edges of the strip. For high formability in the final product, fast cooling on the runout table is required to prevent excessive grain growth. For titanium only containing IF steels, coiling temperature dependency is small; thus the favoured coiling temperature is low (~625°C) to obviate the need for aggressive scale removal techniques. Coiling temperature dependence in niobium containing IF steels is greater, and precipitate coarsening is required to aid recrystallisation during annealing, which may be carried out at up to 50 K higher than in titanium IF steels; thus coiling temperatures are usually >700°C. High reductions, up to approximately 90%, in the cold mill are the key to deep drawability. Annealing temperature is instrumental in determining final drawability providing the Ac 3 temperature has not been exceeded. Time at temperature is also an important factor enabling grain growth to occur, optimising formability. 相似文献