共查询到18条相似文献,搜索用时 93 毫秒
1.
2.
3.
在实验室范围内制备了一种适用于汽车内板的Al-Mg合金材料。对厚度为6mm的热轧板采用不同的冷轧及退火工艺得到了1mm厚的板材。通过阳极覆膜和拉伸试验等方法系统研究了材料的显微组织和力学性能,并计算得到了材料的成形性能参数,包括平均应变硬化指数,平均塑性应变比和极限拉深比。结果表明:总压下率一定时,采用一次冷轧压下量为33.3%、二次冷轧压下量为75%的冷轧工艺可以得到较高的强度和较优的成形性能。在350~450℃的温度范围内,合金在450℃最终退火后表现出较好的成形性能。所得结果对此材料的实际应用有较大指导作用。 相似文献
4.
5.
为探究一种新型铁素体不锈钢的深冲性能,在840~920℃不同温度下对新型铁素体不锈钢的冷轧板做再结晶退火处理,通过XRD、SEM和EBSD等分析方法研究了退火2 min或4 min后,材料微观组织、宏观织构的变化规律对深冲性能的影响及其内在机理.研究表明:保持退火时间2 min,退火温度900℃时,试验钢拥有较多的有利γ纤维织构,主要为{111}112取向,并有少量α纤维织构,此时平均塑性应变比r-=1.77,高于其他退火温度下的值;延长退火时间,在900℃下保温4 min,不同取向晶粒获得了长大机会,晶粒尺寸均匀性显著改善,r-值提高至1.82,试验钢有望取得理想深冲性能. 相似文献
6.
SCP热轧1.0mm超薄规格低碳钢板的组织及性能 总被引:4,自引:0,他引:4
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低岩石钢玺板的组织很细,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
7.
设计了成分为Mg-1.5Zn-xY和Mg-1.5Zn-xCe(x=0,0.2,0.5,1.0)两组试样。通过光学显微镜、扫描电镜、X衍射等研究稀土Y和Ce对热轧态Mg-1.5Zn合金组织和室温成形性能的影响。结果表明:Y和Ce元素可以有效地弱化合金的(0002)基面织构,而且基面织构均沿着TD方向发生一定程度的分裂。Y和Ce元素的加入,使合金中分别形成了Mg2Y5,Mg3Zn3Y和MgZnCe弥散的第二相粒子,起到了细晶强化作用。此外,还有利于合金再结晶行为的发生,使得合金塑性(伸长率最高达27%)、强度(抗拉强度最高达252MPa)和室温成形性能(杯突值最高可达5.46)都得到很大提高。但是,过多Y和Ce的加入将不利于合金性能的进一步提高。 相似文献
8.
9.
应用喷射成形技术制备了Cr12MoV钢,采用金相、扫描电镜、X射线衍射等分析方法对其微观组织进行了研究.将喷射成形材料与铸造方法制备的材料进行了对比,结果表明,喷射态合金更加致密,晶粒更加细小,碳化物的分布也更加弥散,合金元素的偏析程度大大降低. 相似文献
10.
11.
为了揭示铁素体区热轧、冷轧和退火过程中高强Ti-IF钢中织构的演变过程,采用X射线衍射仪研究了铁素体区热轧及随后的冷轧和退火织构的特点.研究表明,在铁素体区热轧后,表面和中心面的织构类型和强度不尽相同,表面上的主要织构组分是剪切织构{110}<001>,而中心面上的主要织构组分是{001}<110>~{223}<110>和{111}<110>,由于织构的遗传性,冷轧和退火后的织构在表面和中心面上也不相同;经不同压下率冷轧后,织构变化趋势一致,表面上{110}<001>组分消失,{001}<110>成为最强组分,而中心面上最强组分由{001}<110>沿α取向线向{112}<110>偏移,冷轧织构由α织构和γ织构组成;退火后,表面上织构的变化与以往结论有所不同,{001}<110>~{112}<110>组分减弱,而γ取向线上的{111}<123>组分增强,{111}<112>和{111}<110>减弱. 相似文献
12.
00Cr17高纯铁素体不锈钢热塑性的研究 总被引:2,自引:1,他引:1
为了充分认识00Cr17高纯铁素体不锈钢的热塑性,用Gleeble-2000热模拟试验机研究了00Cr17钢的热变形行为.利用光学显微镜、扫描电镜和透射电镜对实验钢不同温度下的显微组织进行了观察和分析.结果表明,00Cr17高纯铁素体不锈钢在900~1050℃和高于1350℃下均出现了明显的脆性.在900~1050℃中温区,热塑性恶化主要是由于晶界上析出Cr23C6所致,而在1350℃以上的高温区,热塑性恶化主要是由于部分晶界优先开始熔化所致. 相似文献
13.
H.F.G. de Abreu A.D.S. Bruno S.S.M Tavares R.P. Santos S.S. Carvalho 《Materials Characterization》2006,57(4-5):342-347
AISI 444 is a Mo-alloyed ferritic stainless steel which presents good naphthenic corrosion resistance, making it attractive for applications in petroleum refining plants; however, good formability is also important. To achieve good formability with this alloy the annealing process is crucial. The annealing temperature in ferritic stainless steel is usually around 850 °C, which falls in the range of sigma phase precipitation. A means to avoid this precipitation is to anneal at temperatures around 1000 °C followed by rapid cooling. Annealing at high temperatures can cause grain growth and carbide or nitride precipitation which can result in a reduction of room temperature toughness. In this paper, the rolling and recrystallization textures of AISI 444 steel were studied in samples cold rolled with different thickness reductions (30%, 60%, 80% and 90%) followed by annealing at 955, 980 and 1010 °C. Aspects of grain size and carbide precipitation after annealing were characterized using EBSD and AFM. The material drawability was analyzed through strain rate or Lankford (r) coefficients calculated from texture results. 相似文献
14.
《Materials at High Temperatures》2013,30(1-2):105-112
AbstractBreakaway oxidation of 15–18 % Cr ferritic stainless steels occurring in water vapour is described in the temperature range 800–1000°C. The failure of the protective chromia scale leads to iron oxide(s) nodule formation with accelerated kinetics. Characterisation of the (Fe,Cr)2O3 initial oxide scale by Raman spectroscopy and photoelectrochemistry shows chemical evolution with oxidation time, with increasing Cr/Fe ratio before haematite suddenly appears at the steel-oxide interface. The mechanisms for such a phenomenon are discussed, first on a thermodynamic point of view, where it is shown that chromium (VI) volatilisation or chromia destabilisation by stresses are not operating. It is rather concluded that mechanical cracking or internal interface decohesion provide conditions for haematite stabilisation. From a kinetic point of view, rapid haematite growth in water vapour compared to chromia is thought to be the result of surface acidity difference of these two oxides. 相似文献
15.
16.
In the present work, the possibilities of tailoring crystallographic texture via cross rolling are presented. It is shown that a strong rotated Brass texture develops upon cross rolling in aluminium alloys which also remains intact during the subsequent recrystallisation annealing treatment. The governing mechanisms behind the evolution of deformation and recrystallisation texture are discussed in terms of effect of strain path on stability of deformation texture components and strain-induced boundary migration mechanism, respectively. In addition, the likelihood of rotated Brass texture having a positive effect on formability is discussed in terms of sluggish cross-slip criteria as the rotated Brass texture presents a unique scenario where cross-slip is inhibited along all the three principal directions. 相似文献
17.
研究了中温热处理对2种高碳铁素体不锈钢430和Cr21显微组织和抗拉强度的影响,热处理温度分别为700℃、800℃、900℃.对于430来说,通过中温热处理可以使马氏体脆性降低,其中700℃处理后其抗拉强度最高.而Cr21可以通过中温热处理控制其碳化物的析出来改变其力学性能.在800℃处理后其抗拉强度达到最大值.通过对冲击断口的扫描电镜分析发现,中温热处理不仅提高了430不锈钢的抗拉强度,而且其韧性也有一定提高.对于Cr21来说,虽然热处理提高了其抗拉强度,但是断口仍具有一定的脆性特征. 相似文献
18.
研究了一种Ti—IF(Interstitial—free)钢在铁素体区热轧和退火过程中织构的变化.由于轧制过程摩擦的影响,热轧织构和退火织构在厚度方向上都有很大的差异.在钢板的表层,热轧织构的主要组分是{110}(001),退火后表层的铁素体晶粒没有发生再结晶,该组分转变为(001)(110);在试样的中心和1/4面,热轧织构组分主要是较弱的(111)//ND(板法向)织构和部分(110)//RD且在{001}(110)处最强;退火后中心面上的晶粒发生了完全再结晶,{001}组分转变为(111)//ND组分使(111)//ND织构成为唯一织构组分且在{111}(112)处最强. 相似文献