390MPa级超低碳BH钢织构演变规律

采用ODF织构分析方法,对390 MPa级超低碳BH钢板热轧、冷轧、退火过程织构演变规律进行研究,并对不同冷轧压下量和不同退火工艺织构进行分析。结果表明:经冷轧变形后的钢板有较强的择优取向,具有典型的{112}<110>和{111}<110>织构,形变织构中的不利织构{001}<110>较强;冷轧压下率为80%时再结晶退火后钢板具有较强的γ织构,{111}<112>织构取向密度高达11.7;退火温度和保温时间对α织构影响不大,提高退火温度和延长保温时间使γ织构增强,r值增加。     

INFLUENCE OF COLD ROLLING TECHNOLOGY ON TEXTURE EVOLUTION OF IF STEEL

1．Illtroduct!onWhilst the metallurgy of*theurgy warm rolling ofIF steel In the ferrlte region has beenextensively studied 11,2],that ofcold rolling has not received the same amouM ofattentlon．This is probably because there has been less cold rolling tec…     

铁素体轧制对普通用冷轧钢板组织和性能的影响

采用光学显微镜和扫描电镜对比研究了铁素体区热轧工艺及奥氏体区热轧工艺对普通用冷轧钢板(SPCC)产品热轧组织、冷轧组织及性能的影响。结果表明,与奥氏体区轧制工艺相比,采用铁素体区热轧工艺生产的SPCC热轧板晶粒尺寸会增大约17 μm,{111}面织构数量减少了8.74%,强度略微降低,而{001}<110>织构数量增加了12.40%,强度提高了19.81。此外,采用铁素体区热轧工艺生产的SPCC成品晶粒呈近似等轴状,与奥氏体区热轧工艺相比平均晶粒尺寸增大了4.5 μm。SPCC铁素体区轧制热轧板中更大的晶粒尺寸、更少的{111}面织构及更强的{001}<110>取向织构导致了冷轧成品更低的屈服强度和塑性应变比r值,较奥氏体区热轧工艺而言平均屈服强度降低了19 MPa,平均r值下降了1.1。     

Effect of Asymmetric Hot Rolling on the Texture Evolution of Fe–3%Si Steel

In Fe–3%Si steel, the hot rolling process affects not only the hot rolling texture but also the primary recrystallization texture. Here, the effect of asymmetric hot rolling was studied by comparing the difference in the texture evolved between asymmetric and symmetric hot rolling. The effect of asymmetric hot rolling on the texture of primary recrystallized Fe–3%Si steel was also studied. The symmetric hot rolling of Fe–3%Si steel produces a rotated cube texture at the center but Goss and copper textures near the surface. Asymmetric hot rolling tends to produce Goss and copper textures even at the center like the texture near the surface. After primary recrystallization, the dominant texture at the center changes from {001} <210> to {111} <112> and the new texture has a higher fraction of the grains which make the low energy boundary with Goss grains than that of symmetric hot rolling.     

Recrystallization texture characteristic and drawability of a warm rolled and cold rolled interstitial-free steel

The recrystallization textures and drawability in an interstitial-free (IF) steel were investigated as a function of cold rolling reduction. The hot bands for further cold rolling were obtained by lubricated hot rolling in the ferrite region. The orientation distribution function (ODF) was applied to analyze recrystallization textures. Texture analysis showed that hot bands rolled in the ferrite region had strong {111}//ND texture component. The {111}//ND recrystallization texture of the cold rolled steel with 73% reduction displayed the highest intensity, but weakened as more cold work was introduced. The highestr-value was obtained at a cold reduction of 73% when the hot band was previously rolled in the ferrite region.     

超纯铁素体不锈钢织构演变与成形性能的研究

系统研究了超纯铁素体不锈钢(w(Cr)=17%)沿钢板厚度方向各层织构的演变规律和不同精轧温度对织构演变及成形性能的影响规律。采用X射线衍射仪分析了宏观织构演变。研究表明: 热轧及退火后, 钢板表层以剪切织构为主, 中心层由?和?纤维织构组成; 冷轧后, 各层均由较强的?纤维织构和较弱的?纤维织构组成; 冷轧退火后各层均形成?纤维再结晶织构。与高温精轧相比, 低温精轧有利于冷轧退火板?纤维再结晶织构的强化、偏离{111}<112>组分的程度降低, 从而显著改善冷轧退火板的成形性能。     

新能源汽车用含稀土无取向硅钢生产过程中组织、织构演变

采用光学显微镜、X射线衍射仪及扫描电镜对含稀土无取向硅钢整个生产流程中的显微组织及织构演变进行研究。结果表明,热轧板在厚度方向上有显著的分层,即表层的再结晶层、过渡层、中间层的变形组织层,其织构主要包含铜型、黄铜型织构;正火后晶粒发生了完全再结晶,织构类型相对热轧基本无变化,但强度减弱;两次冷轧后的组织均为纤维组织,形成了以α、γ线性织构为主的织构类型,还出现了强度较高的反高斯织构如{001}<110>、{112}<110>、{111}<110>;脱碳退火后发生部分再结晶,织构相对于冷轧态α、γ线性织构强度均减小;在高温退火阶段晶粒发生再结晶,存在以{111}<112>、{111}<110>为主的γ织构,以及{100}<001>织构。     

含铜低温取向硅钢轧制过程中的组织及织构演变

采用Zeiss光学显微镜及X射线衍射仪对含铜低温取向硅钢生产过程中热轧、一次冷轧、脱碳退火和二次冷轧阶段的显微组织与织构的演变规律进行了研究。结果表明:热轧试样的组织与织构在厚度方向上呈现明显的梯度变化,试样的表层和过渡层发生再结晶,过渡层存在较强的Goss织构,中心层存在以{001}<110>为主的强α织构。一次冷轧后试样组织被轧制成沿轧向分布的纤维状组织,织构以强α和弱γ织构为主。脱碳退火后试样发生再结晶,晶粒平均尺寸为15.69 μm,总体织构强度有所减弱,但Goss织构强度升高。二次冷轧后组织由等轴晶粒变为纺锤状组织,织构以弱α和强γ织构为主,其中{111}<112>强度最高。     

低碳钢板冷轧退火组织和织构

分别采用基于薄板坯连铸连轧(CSP)工艺和传统热连轧工艺条件下的低碳钢板作为冷轧基料,在实验室模拟现场工艺进行了冷轧和退火。通过金相观察和X射线衍射织构分析,比较了两种工艺下低碳钢板的组织和织构演变的规律。结果表明:两种试样冷轧后α取向线上显著增加的织构有较大的区别,CSP工艺下是{001}〈110〉,而传统工艺下是{112}〈110〉;在同样的冷轧及退火工艺条件下,CSP条件下的钢板在退火过程中发生再结晶需要的温度更高,时间更长;对于CSP钢板,退火对γ取向线的影响要大于冷轧对其的影响,而对于传统热连轧钢板,冷轧和退火过程对γ取向线都有比较大的影响。     

轧制方向对Fe-3％Si合金织构演变规律的影响

形成锋锐的Goss织构是取向硅钢获得优异磁性能的关键, 初始样品表层中较强的Goss织构对最终的强Goss织构起重要作用. 本文通过改变硅钢冷轧方向获得不同的初始织构及初始组织, 考察热轧板表层及中心层不同的组织及织构的进一步变化对一次冷轧、中间退火、二次冷轧及脱碳退火、二次再结晶退火后的织构及组织变化规律的影响. 探讨了这些特殊方式制备的样品中Goss织构的形成条件. 结果表明, 强烈的初始组织及织构的差异随轧制及退火次数的增多逐渐消失; 最终二次再结晶都可顺利进行, Goss织构及磁性能差异并不大. 虽然初始样品中Goss织构的强弱差异很大, 但因各阶段都可以形成较强的 {111}<112>织构, 弥补了初始样品中Goss织构过弱的不足, 因此轧制方向及初始组织都对最终的织构影响不大. 研究还证实了立方织构的遗传性; 横向轧制是消除稳定的{112}<110>轧制织构的有效方法.     

�����¶ȶ������岻���00Cr21Mo1֯����Ӱ��

 本文通过金相和EBSD等技术,观察了不同热轧终轧温度对00Cr21Mo1铁素体不锈钢热轧态、热轧退火态、冷轧退火态织构的变化的影响情况,并分析讨论了较高终轧温度下铁素体不锈钢00Cr21Mo1塑性应变比（Rm）较低的原因。结果表明,较低的终轧温度下,00Cr21Mo1热轧态组织形变带宽度较小,受轧辊切应变而形成的{110}<001>、{110}<112>、{4 4 11}<11 11 8>织构组分强度较小,且均匀、分散,最终冷轧退火态以{111}面织构为主,塑性应变比较高。     

热浸镀锌Ti- IF和Nb+Ti- IF钢组织和织构研究

实验对比研究了Ti- IF和Ti+Nb- IF钢热轧、退火过程中微观组织和织构的变化,采用透射电镜和能谱仪研究分析了二相粒子在热轧、冷轧、退火过程中的形貌、尺寸及分布。实验结果表明：添加Nb使得Ti+Nb- IF钢中析出粒子较Ti- IF钢更为细小且弥散,抑制了γ纤维再结晶织构的发展,削弱了{111}〈110〉在γ纤维织构中的强度,且细小的析出物有助于提高IF钢的抗拉强度,但两者成形性能没有明显差异。     

SPATIAL ORIENTATION DISTRIBUTION OF CRYSTALLITES IN COLD-ROLLED Al-KILLED STEEL SHEET DURING RECRYSTALLIZATION ANNEALING

用晶体取向分布函数研究了含0.13％Cu的低碳镇静钢冷轧薄板再结晶退火过程织构的变化。结果表明,冷轧织构主要为平行于板面法线的<111>纤维织构组分和{001} <110>组分;此两组分的漫散构成平行于轧向的<110>部分纤维织构。在再结晶过程中<111>纤维织构增强,{001} <110>组分减弱,因而<110>部分纤维织构也逐渐收缩,表明它不是一个独立的织构组分。     

Texture Evolution,Formability and Ridging Resistance of a Sn-bearing Ferritic Stainless Steel Under Different Hot Band Annealing Temperatures

The microstructure, texture evolution and spatial orientation distribution during cold rolling and the subsequent annealing as well as formability and ridging of a Sn-bearing ferritic stainless steel under different hot band annealing temperatures were investigated. The four hot bands with annealing temperatures of 900, 950, 1000 and 1050 °C were all cold-rolled to 80% reductions and then were annealed at the same temperature of 900 °C. The results show that optimizing hot band annealing process is benefi cial to reduce the amount of {001} 110 grains and weaken the texture intensity, and thus, to reduce ridging and improve formability. In the present study, the fi nal sheets with hot band annealing temperature of 900 °C possess small and inhomogeneous grains with a large amount of {001} 110 orientations, which deteriorates the formability and increases the ridging. In comparison, the fi nal sheets with hot band annealing temperature of 950 °C are comprised of uniform and equiaxed 111//ND(ND: normal direction) recrystallized grains with a high texture intensity favorable for the improvement in r value and surface quality. However, when hot band annealing temperature further increases to 1000 and 1050 °C, it shows a sharp decrease in r value and a remarkable increase in ridging as a result of a reduction in γ-fi ber texture intensity and an increase in grain size in the fi nal sheets. Suitable controlling and optimizing hot band annealing process is essential to improve the formability and reduce the ridging.     

柱状晶对Fe-3%Si电工钢冷轧织构演变规律的影响

Fe-3%Si电工钢铸锭中普遍存在柱状晶,其晶体学及形状各向异性对随后的热轧、冷轧及退火织构产生很大的影响.利用xRD与EBSD技术对长轴分别平行于轧面法向(ND),轧制方向(RD)和横向(TD)的柱状晶冷轧样品的织构及组织进行了研究,并对晶界的特殊作用进行了分析.结果表明,中等压下量下,3种柱状晶样品具有不同程度的{001}织构遗传性,即3种样品均不同程度的摆脱了{111}线织构的形成;柱状晶长轴平行于ND和TD时,{001}取向在冷轧时得到大的保留;柱状晶长轴平行于RD时,得到最强的{111}〈112〉织构;柱状晶长轴平行于TD时,冷轧组织中旋转立方织构及{111}〈110〉织构较强.此外,3种样品的织构均表现出由立方→{001}〈130〉→{113}〈251〉的过渡路径,与等轴多晶样品沿α线和γ线转动的路径不同.不同方向的柱状晶晶界对冷轧变形过程中晶粒转动的作用不同,但因晶粒尺寸大而作用有限,且与初始取向相关.     

Structural aspect of delamination crack formation during the HTMT of steels with a ferritic structure

The fine structure, texture, and fracture of the ferritic 08Kh18T1 steel subjected to repeated hot rolling at temperatures of 800–1100°C and reductions of 35, 50, and 65% have been studied. When significant strains are reached, a layered subgrain structure forms in the steel, and {100} and {111} planes are predominantly located in the rolling plane. The mechanisms of delamination crack formation during rolling under HTMT conditions are considered. The development of a crack in a material with a layered structure is analyzed theoretically.     

FTSR铁素体区轧制生产SPHE钢的组织与性能

采用金相观察、透射电镜、化学相分析、XRD织构检测及性能测试等手段分析了FTSR铁素体区轧制工艺生产的SPHE热轧板的微观组织及力学件能,探讨了一种生产SPCE级深冲用钢冷轧基板的新思路.研究结果表明:热轧态组织为粗大而不均匀的铁素体,晶粒沿轧向伸长,组织中有较多细小的析出粒子和高密度位错,有利于冲压性能的{111}织构较弱,但各种类型的织构分布相对较均匀;SPHE热轧板的性能水平:σ_(0.2)为220MPa,σ_b为290 MPa,伸长率δ为37.5%,n值为0.20.     

深冲SPCE与超深冲IF钢r值差异的ODF分析

用取向分布函数（ＯＤＦ）方法对造成ＩＦ钢板与ＳＰＣＥ钢板ｒ差异的织构因素进行了分析。结果指出，由于铁素体中间隙原子存在状态不同经冷轧后冷轧织构不同，进而经退火后退火织构不同，ＩＦ钢的退火织构以｛１１１｝＜１１０＞、｛１１１｝＜１１２＞织构为主，ＳＰＣＥ钢的退火织构以｛００１｝＜１１０＞织构为主。｛１１１｝取向晶粒的ｒ大于｛００１｝取向晶粒的ｒ值，因而超深冲ＩＦ钢有比深冲ＳＰＣＥ钢板高的ｒ值。     

终轧温度对含钛铌超低碳铁素体不锈钢显微组织、织构和力学性能的影响

实验室研究了终轧温度对钛、铌复合添加的16%Cr超低碳氮铁素体不锈钢的显微组织、织构和力学性能的影响。结果表明,当终轧温度从940℃降低到800℃时,热轧退火钢板和冷轧退火钢板的铁素体晶粒尺寸均减小,因此采用低温终轧有利于细化铁素体晶粒。降低终轧温度,热轧退火后钢板中形成的γ纤维明显增强且比较均匀。由于织构具有遗传性,在冷轧退火钢板中也形成了均匀的γ再结晶织构。采用较低的终轧温度既有利于提高成型性又有利于改善材料的各向异性。     

磁场预退火对取向硅钢二次再结晶组织及织构的影响

对二次冷轧后高温退火前3.2%Si取向硅钢在实验室自主设计研发的脉冲磁场预退火管式炉内进行不同温度的预退火处理,通过光学显微镜与XRD对其组织织构进行分析,利用硅钢片磁性能测试系统对高温退火后的试样进行磁性能分析。结果表明,经脉冲磁场预退火处理后,整体上取向硅钢平均晶粒尺寸随预退火温度升高略微减小,晶粒尺寸主要集中在10~25 μm范围内;通过ODF图及{200}极图分析可知,经脉冲磁场预退火后,最强织构随预退火温度的升高从{112}<110>织构变化到{223}<110>织构和{111}<110>织构;随着预退火温度的升高,高温退火后试样的磁性能反而降低。