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With its superior comprehensive properties,cold-rolled enameling steel is widely applied in many fields.However,its low yield stress greatly limits its application.This study aims to improve the yield stress of cold-rolled enameling steel under the premise of meeting formability and enameling properties by strengthening the ferrite matrix via solid strengthening of Mn.The grain size of ferrite before and after enameling,mechanical properties of annealed steel,and precipitation behavior of second-phase precipitates are obtained through studying the microstructure and properties of enameling steel at different stages.The microstructure of the steel investigated at room temperature is found to contain equiaxial ferrite and bunchy cementite particles;the ferrite grains have grown to some extent after enameling.The fine dispersed TiC particles and cementite particles contained in the annealed steel are the main factors improving the hydrogen storage capability.Finally,the result of a falling-ball impact test shows that the steel has achieved excellent adherence. 相似文献
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通过对00Cr17Ti经热带退火、不经热带退火两种工艺的冷轧板进行对比试验,在分析显微组织、织构的基础上,研究了热带退火对00Cr17Ti薄板表面皱折的影响。研究结果表明:与不经热带退火相比,经热带退火能使成品薄板的表面皱折大大减轻,最大粗糙度仅为12.06 μm,平均粗糙度仅为1.27 μm。两种工艺的成品板表面皱折程度的不同是由两者在显微组织、微织构上的差异造成的。与不经热带退火相比,经热带退火的成品薄板在板厚方向具有较均匀的组织,板宽方向的织构梯度较小,晶粒簇较间断、细窄、分散,所有这些使得成品薄板的表面皱折大大减轻。为了满足用户对薄板表面质量的严格要求,对热轧带进行退火是很有必要的。 相似文献
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以低碳含磷钢为研究对象,通过分析不同卷取温度(600、650、700℃)时热轧态和冷轧退火态的显微组织、力学性能及退火再结晶动力学行为,对比研究了微铌(0.02%)处理和铌钛复合微合金化(0.02%Nb+0.012%Ti)对钢的组织和性能的影响。研究结果表明,与微铌处理钢相比,铌钛复合微合金化钢在600℃卷取时析出物数量更多,在更高温度卷取时熟化速度更快,650℃卷取时即熟化到一定程度。低温(600℃)卷取时,铌钛复合微合金化钢的退火再结晶更难,800℃×30s连续退火可以保证完全再结晶。将温度继续升高至800℃以上,会导致强度下降,在一定程度上影响板卷之间的性能稳定性。 相似文献
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在实验室加工了具有不同稀土、钛和铌含量的冷轧搪瓷钢板,测定了钢板的再结晶温度和模拟退火后钢板的成形性能,并观察了其金相组织,分析了钢中的第二相粒子。结果表明,在单加稀土、复合添加稀土 钛或稀土 钛 铌的3种钢中,单加稀土的钢再结晶温度最低,而含稀土 钛 铌的钢再结晶温度最高;经高温退火后,含稀土 钛 铌钢的伸长率和r值在3者中最高,达到了超深冲(即EDDQ)级别。 相似文献
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《Baosteel Technical Research》2015,9(4):40-44
Ultra-low carbon(ULC),cold-rolled sheet steels for porcelain enameling containing alloys of titanium and boron are studied. The microstructure,mechanical properties,inclusions,and precipitates of the sheet steels are analyzed. The hydrogen permeation time of the sheet steels as-annealed and after skin-passed or cold-rolled at different reductions are measured. It is show n that the sheet steels possess different features of enameling properties in hydrogen permeability,fishscale resistance,and pinhole resistance. 相似文献
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稀土、钛和铌对冷轧超低碳搪瓷钢性能的影响 总被引:2,自引:0,他引:2
用相同的工艺条件加工不同稀土、钛和铌含量的冷轧搪瓷钢板。测定了钢板的力学性能,分析了钢中的第二相粒子,用电化学方法测定钢板的氢渗透性以及预拉伸变形的影响。结果表明,复合添加RE、Ti和Nb元素的钢板既具有较高的伸长率和γ值,又具有良好的贮氢能力。随着预拉伸变形量的增加,钢板的贮氢能力显著提高。 相似文献
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热带退火对00Cr17Ti薄板成形性能的影响 总被引:4,自引:1,他引:3
通过对00Cr17Ti经热带退火、不经热带退火两种工艺的对比试验,在分析显微组织、织构、值和ΔR值的基础上,研究了热带退火对00Cr17Ti薄板成形性能的影响。研究结果表明:与不经热带退火相比,经热带退火能使00Cr17Ti薄板的值提高约0.2,但是,ΔR值会增大约0.7。这是由两种工艺的成品薄板在显微组织、织构上的差异造成的。与不经热带退火相比,经热带退火的成品薄板具有更大的晶粒尺寸、更加均匀的组织以及更强的{111}再结晶织构,这使值提高,但是,其{111} γ取向线上各织构组分强度的非常不一致却导致ΔR值明显偏大。 相似文献
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针对近α型Ti?6.0Al?3.0Zr?0.5Sn?1.0Mo?1.5Nb?1.0V新型钛合金,在退火温度740 ℃的基础上,研究了退火时间对其组织与力学性能的影响。结果表明:经过3次真空自耗电弧炉熔炼,三火热轧后得到的板材组织由初生α相基体及β转变组织组成的部分再结晶组织和加工态组织等组成。随着退火时间的增加,退火板材的显微组织均以初生α相为主,且α相所占的比例从81.73%逐渐增加至85.61%,组织中长条状α相逐渐破碎球化,等轴α相开始均匀化、粗化。随着退火时间的增加,退火板材的延伸率逐渐增加,抗拉强度先降低再增加然后又降低,屈服强度先增加后降低,显微硬度先增加后降低。退火时间为1 h时,板材的断口由滑移带、涟波、小等轴韧窝组成,断裂方式为韧性断裂,退火时间大于等于2 h时,板材的断口完全由等轴韧窝组成,断裂方式为韧性断裂。最佳退火工艺为740 ℃退火2 h,此时板材的抗拉强度、屈服强度、延伸率和显微硬度分别为:984 MPa、941 MPa、15.27%、HV 347.67。研究结果对高强耐蚀钛合金退火工艺的制定有指导作用,为解决钛合金在实际生产中遇到的问题提供了科学依据。 相似文献
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在满足性能要求和少添加高价合金元素的前提下,以开发出高贮氢性能及可适应后期多元化涂搪工艺为目的,开发出一种含钛低碳冷轧搪瓷用钢。对搪瓷钢不同状态的组织和性能进行了研究,获得了第二相粒子的析出规律、涂搪前后的晶粒尺寸及析出物的变化规律及退火工艺对强度的影响规律。对钢板的氢渗透时间进行了测定,试验结果与随后的涂搪试验吻合。搪瓷用钢的室温组织为铁素体,涂搪后晶粒有一定程度的长大;钢板中弥散粗大的第二相粒子Ti4C2S2是提高钢板贮氢性能的主要因素。730℃保温5h退火后,氢渗透时间tb大于18min,氢扩散系数D小于0.44×10-6cm2/s;钢板与涂层具有良好的密着性,可承受110g钢球在2m高度自由落体的冲击。 相似文献
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采用电子背散射衍射技术对高硅钢近柱状晶初始组织直接热轧、温轧、冷轧和退火组织及织构演变进行分析,并测定相应退火板的磁性能.该实验条件下组织与织构演变规律体现了表层剪切细小组织和中心层粗大组织的竞争关系,其中中心层组织与原始立方取向相关或表现为α线取向.柱状晶的影响在最终退火组织中仍存在,少量立方取向区域可遗传到最终退火板中,虽然没有大量出现,仍有效削弱了{111}织构.形变退火过程中与原始立方取向线有关的晶粒尺寸普遍较大,有利于磁性.样品最终的磁感应强度低于文献报导的强{120}〈001〉或{100}〈021〉织构样品,但高于普通无取向高硅钢,且轧向和横向磁感应强度值差异小,所以柱状晶组织有利于无取向高硅钢的制备. 相似文献
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SHI Haisheng ) YAN Fei ) FAN Junfei ) LE Hairong ) JIN Bingzhong ) ) Advanced Technology Division Research Institute Baoshan Iron & Steel Co. Ltd. Shanghai China ) Cold-rolling Plant Wuhan Iron Steel Co. Ltd. Wuhan China 《Baosteel Technical Research》2011,5(3):20-27
A high alloyed Vanadis4(V4) steel was produced by spray forming process in Baosteel,and the microstructure of the as-sprayed steel and its evolution during hot rolling and annealing processes were characterized.It was found that the as-sprayed V4 steel has a homogeneous and fine scale microstructure with uniform dispersion of carbides.The hot rolling temperature is the key factor in controlling the evolution of type,morphology and distribution of carbides,as well as the matrix microstructure of the as-rolled steels.The optimized processing parameters for the as-sprayed V4 steel are rolling at 1 050℃ and then annealing at 900℃.The microstructural evolution mechanisms during hot rolling and annealing are determined according to the microstructural analyasis of the material at different stages. 相似文献
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通过比较相同冷轧与罩式退火工艺下Mn-Si系和铌微合金化2种汽车用低合金高强钢的显微组织与力学性能,研究微量铌在冷轧罩式退火低合金高强钢中的强化机理。利用OM、SEM、TEM和拉伸试验机分别对2种钢的显微组织与力学性能进行了表征。对比分析表明:相对热轧板来说,2种钢冷轧退火板的铁素体晶粒和第二相析出物的尺寸都有所长大,导致了强度降低。相对Mn-Si钢而言,铌微合金化钢热轧板和冷轧退火板中的铁素体晶粒和第二相析出物尺寸更细小,细小第二相析出物的数量也更多,在相同的伸长率水平下明显提高了强度。冷轧罩式退火板的强化机理分析表明,铌微合金化低合金高强钢的主要强化方式是细晶强化和NbC的沉淀强化;研究认为添加质量分数为0.025%的铌时细晶强化更强烈。 相似文献
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K. Toda H. Gondoh H. Takechi H. Masui 《Metallurgical and Materials Transactions A》1976,7(11):1629-1636
For high-strength steel sheets, a new concept has become necessary,viz, the relation between strength and formability. When the relation between tensile strength and elongation is appraised for
ranking in terms of the strengthening mechanism, it is found that the substitutional solid-solution hardening type is excellent
and the precipitation hardening type is inferior. In batch annealing, the phosphorus-added aluminum-killed steel sheets are
representative of the former type having excellent formability as indicated by a highr values despite their tensile strength of 450 N/mm2. The titanium-added aluminum-killed steel sheets, which are representative of the latter type, have a tensile strength of
600 N/mm2 and a relatively highr value. Continuous annealing of the highstrength steel sheets of the same chemical composition causes higher yield stresses
and combinations of yield stress and elongation. Alternatively with continuous annealing the same level of strength can be
achieved with smaller additions of alloying elements than with batch annealing. An additional advantage of continuous annealing
is the uniformity of properties along the length of the coil. The rapid cooling possible after continuous annealing allows
production of high strength steel sheets having excellent mechanical properties that are unobtainable in the batched annealed
steels. For example, steel sheets of 0.4 pet Si and 1.4 pet Mn after continuous annealing, haven values and Erichsen values as higher than conventional low-carbon rimmed or capped steel sheets even while they have a tensile
strengths of 550 N/mm2. 相似文献
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