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A. S. Tataru V. K. Potemkin R. Kawalla A. S. Lukin A. V. Dolgov 《Steel in Translation》2014,44(7):491-497
The goal is to produce hot-rolled dual-phase steel of strength class DP 450–600 at OAO Novolipetskii Metallurgicheskii Kombinat (NLMK). The steel’s final structure and properties is greatly affected by single-stage strip cooling on the output roller conveyer of the 2000 continuous broad-strip mill. The influence of the hot-rolling parameters on the structure and mechanical properties of the hot-rolled SPRC440R steel from which cold-rolled dual-phase steel is produced at OAO NLMK is studied in the laboratory. The temperatures and rates for accelerated cooling on the output roller conveyer of the 2000 continuous broad-strip mill at OAO NLMK are calculated by means of a mathematical model. The laboratory data and simulation results are used in developing trial conditions for industrial rolling. Recommendations are made regarding the production of hot-rolled dual-phase steel corresponding to strength class DP 450–600. 相似文献
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控制冷却对热轧双相钢板组织及性能的影响 总被引:1,自引:0,他引:1
利用THERMCMASTOR-Z型热加工模拟试验机研究了控制冷却工艺参数对Si-Mn-Cr钢的显微组织的影响,并在带钢热连轧机上进行了试验,确定了获得铁素体和马氏体的双相组织的最佳生产工艺。生产的双相钢板、其成形性、烘烤硬化性及疲劳性能优良,冲压的汽车零件已装车使用。 相似文献
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V. Colla M. DeSanctis A. Dimatteo G. Lovicu R. Valentini 《Metallurgical and Materials Transactions A》2011,42(9):2781-2793
The purpose of the present work is the implementation and validation of a model able to predict the microstructure changes
and the mechanical properties in the modern high-strength dual-phase steels after the continuous annealing process line (CAPL)
and galvanizing (Galv) process. Experimental continuous cooling transformation (CCT) diagrams for 13 differently alloying
dual-phase steels were measured by dilatometry from the intercritical range and were used to tune the parameters of the microstructural
prediction module of the model. Mechanical properties and microstructural features were measured for more than 400 dual-phase
steels simulating the CAPL and Galv industrial process, and the results were used to construct the mechanical model that predicts
mechanical properties from microstructural features, chemistry, and process parameters. The model was validated and proved
its efficiency in reproducing the transformation kinetic and mechanical properties of dual-phase steels produced by typical
industrial process. Although it is limited to the dual-phase grades and chemical compositions explored, this model will constitute
a useful tool for the steel industry. 相似文献
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通过四种不同的分步淬火热处理工艺,相应地获得了四种不同组织的双相钢.研究表明,随着马氏体含量的增加,双相钢的最大剪切应力随之增加.绝热剪切带的出现和由它引起的裂纹是动态扭矩试验时的重要特征. 相似文献
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通过四种不同的分步淬火热处理工艺,相应地获得了四种不同组织的双相钢.研究表明,随着马氏体含量的增加,双相钢的最大拉伸强度随之增加,延伸率随着马氏体的增加而降低.试样的铁素体晶粒大小在不同的马氏体范围内对强度和延伸率有不同的影响. 相似文献
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Xue Cui Tao Wang Li Wang Song Zhang Chunhua Zhang Chenliang Wu Weian Zong Xueying Sun Haitao Chen 《国际钢铁研究》2024,95(2):2300405
Herein, 24CrNiMo low-alloy steel is successfully prepared using selective laser melting (SLM) technology. Effects of dual-phase region quenching treatment on microstructure and mechanical properties of SLM 24CrNiMo low-alloy steel are analyzed. The results show that after three kinds of dual-phase region quenching treatment, different martensite–ferrite dual-phase microstructure of the as-quenched alloy steel is obtained. In the range of austenitizing temperature from 760 to 820 °C, the content and size of the ferrite decrease; on the contrary, the content and size of the martensite increase. Furthermore, with the austenitizing temperature increasing, the morphology of the ferrite gradually changes from acicular ferrite + polygonal ferrite to acicular ferrite, while the lath characteristics of the martensite become more and more obvious. For electron backscatter diffraction results, with increasing the quenching temperature, the crystallographic morphology gradually changes from columnar grains to equiaxed grains; meanwhile, the extreme value of texture strength and the average size of grains are both decreased. When the austenitizing temperature is 820 °C, the microhardness and tensile strength of the as-quenched alloy steel are much higher than that of the as-deposited alloy steel. 相似文献
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经济型双相不锈钢的研发进展 总被引:1,自引:0,他引:1
经济型双相不锈钢是一种高性能低成本的氮合金化不锈钢新材料,具有典型的铁素体-奥氏体双相组织。利用氮取代镍元素的奥氏体化作用,降低成本的同时获得优良的力学性能和耐腐蚀性能。介绍了经济型双相不锈钢的发展历史,重点讨论了合金元素和热处理对相变、力学性能和耐腐蚀性能的影响规律,并与304和316进行对比;同时,分析了经济型双相不锈钢焊接性能和焊接工艺的研究进展。经济型双相不锈钢S32101、S32003、S32202等,已用于核电、桥梁、建筑、热交换器等行业,取代传统奥氏体不锈钢AISI 304和316。由于经济型双相不锈钢具有高强度和优良耐蚀性,同时镍、钼等贵金属的含量都较低,已成为未来不锈钢发展的方向之一。 相似文献
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V. F. Terent’ev S. V. Yashchuk S. A. Korableva D. V. Prosvirnin A. B. Nedbailo O. N. Baklanova I. G. Rodionova 《Russian Metallurgy (Metally)》2014,2014(4):314-319
The static and cyclic mechanical properties of a dual-phase steel and a TRIP steel having a comparable yield strength are studied. The effect of deformation and subsequent aging on the fatigue strength of the dual-phase steel is investigated, and the fractographic features of the fatigue fracture are analyzed. 相似文献
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通过Thermo-Calc热力学计算、OM和FE-SEM观察、力学性能和腐蚀性能试验对不同固溶温度下的特超级双相不锈钢进行分析和研究。结果表明:σ相和非平衡氮化物是固溶水冷组织中的主要析出相,当固溶温度低于1050 ℃时,σ相优先沿双相界面析出,显著降低双相不锈钢的冲击韧性;当固溶温度高于1100 ℃,非平衡氮化物开始在铁素体晶粒内部析出,且随着固溶温度的升高,非平衡氮化物析出数量增加。这是由于固溶水冷过程中氮在铁素体中的溶解度快速降低,过饱和的氮来不及扩散到相邻奥氏体中,只能以氮化物的形式析出。随固溶温度升高,铁素体含量增加,奥氏体含量降低,实验钢的强度增加,冲击韧性降低。在1080~1120 ℃之间固溶时,双相比例接近1∶1,S32707特超级双相不锈钢具有优良的综合力学性能和耐晶间腐蚀性能。 相似文献
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低屈强比钢板要求双相组织,生产控制难度大。通过发挥预矫直机的大压下量预矫作用,优化Mulpic水冷参数,改善了钢板板形及性能;优化回火温度及时间,控制组织内软硬相比例,确保了钢板各项性能及屈强比。济钢采用在线淬火+离线回火的工艺生产的油罐钢屈强比在0.90以下,一次性能合格率90%以上。 相似文献
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Tensile stress-strain analysis of cold worked metals and steels and dual-phase steels 总被引:1,自引:0,他引:1
A study has been made of the applicability of the differential Crussard-Jaoul (C-J) analysis that assumes the Ludwik power
relation, the modified C-J analysis based on the Swift formula, and the Hollomon analysis to uniaxially prestrained metals
and steels and high strength, formable, dual-phase steels. The pure aluminum and copper metals and a series of plain carbon
steels with carbon ranging from 0.10 to 1.05 pct were uniaxially prestrained by a given amount of strain under ambient temperature.
A plain carbon steel with carbon of 0.10 pct was utilized in manufacturing the dual-phase steels. An empirical analysis exhibited
the limited applicability of the C-J analysis for the interpretation of the stress-strain relationship of uniaxially prestrained
metals and steels. The C-J analysis was also less sensitive to changes in the deformation behavior of the dual-phase steels
in which the ferrite matrix and the shape and distribution of the second phase martensite were altered by three heat treatments.
The modified C-J analysis was most suitable for describing work-hardening of uniaxially prestrained metals and steels. This
analysis revealed that the dual-phase steels deformed in two stages. The first stage was associated with deformation of the
ferrite matrix, and the second stage was associated with uniform straining of ferrite and martensite. The more generally used
Hollomon curves deviated from linearity over all the uniform strain range regardless of the uniaxially prestrained metals
and steels and dual-phase steels. Thus, the Hollomon parameters could not be assigned to an entire curve. 相似文献
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Manpreet Singh Anindya Das T. Venugopalan Krishnendu Mukherjee Mahesh Walunj Tarun Nanda B. Ravi Kumar 《Metallurgical and Materials Transactions A》2018,49(2):463-475
The effects of microstructure parameters of dual-phase steels on tensile high strain dynamic deformation characteristic were examined in this study. Cold-rolled steel sheets were annealed using three different annealing process parameters to obtain three different dual-phase microstructures of varied ferrite and martensite phase fraction. The volume fraction of martensite obtained in two of the steels was near identical (~ 19 pct) with a subtle difference in its spatial distribution. In the first microstructure variant, martensite was mostly found to be situated at ferrite grain boundaries and in the second variant, in addition to at grain boundaries, in-grain martensite was also observed. The third microstructure was very different from the above two with respect to martensite volume fraction (~ 67 pct) and its morphology. In this case, martensite packets were surrounded by a three-dimensional ferrite network giving an appearance of core and shell type microstructure. All the three steels were tensile deformed at strain rates ranging from 2.7 × 10?4 (quasi-static) to 650 s?1 (dynamic range). Field-emission scanning electron microscope was used to characterize the starting as well as post-tensile deformed microstructures. Dual-phase steel consisting of small martensite volume fraction (~ 19 pct), irrespective of its spatial distribution, demonstrated high strain rate sensitivity and on the other hand, steel with large martensite volume fraction (~ 67 pct) displayed a very little strain rate sensitivity. Interestingly, total elongation was found to increase with increasing strain rate in the dynamic regime for steel with core–shell type of microstructure containing large martensite volume fraction. The observed enhancement in plasticity in dynamic regime was attributed to adiabatic heating of specimen. To understand the evolving damage mechanism, the fracture surface and the vicinity of fracture ends were studied in all the three dual-phase steels. 相似文献
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为了研究连退板表层元素富集行为及相互作用,借助扫描电镜、辉光放电光谱仪、光电子能谱仪和透射电镜等技术手段对铝镇静钢和双相钢连退板表层中的富集元素进行了详细地表征与分析。结果表明,铝镇静钢连退板表面的主要富集元素有O、Mn和Al;而双相钢连退板表面的主要富集元素有O、Mn和Si。沿着浅表层深度分析可知,对于合金元素含量较高的双相钢,沿浅表层富集更深,富集深度约为50 nm;而合金元素含量较低的铝镇静钢,富集深度仅约为25 nm。综合分析不难发现,相对于铝镇静钢,双相钢添加了Si元素以后在其表面优先富集Si元素并同时形成了Si的氧化物,从而导致Al元素的富集及氧化物的形成受到了抑制。 相似文献
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探讨了800 MPa级冷轧双相钢的成分体系、冷却处理工艺、组织及性能;研究了退火温度、冷却速率对双相钢性能的影响,分析了双相钢的强化机理,并且优化了退火工艺参数。结果表明,冶炼过程采用C-Si-Mn-Cr-V成分体系,轧制过程采用650℃±20℃的中温卷取,连续退火过程中快冷段投入高氢(H2含量20%)冷却,冷速达到42~50℃/s,能够得到由铁素体和马氏体组成的冷轧双相钢DP800,综合力学性能优良。 相似文献
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为了研究连退板表层元素富集行为及相互作用,借助扫描电镜、辉光放电光谱仪、光电子能谱仪和透射电镜等技术手段对铝镇静钢和双相钢连退板表层中的富集元素进行了详细地表征与分析。结果表明,铝镇静钢连退板表面的主要富集元素有O、Mn和Al;而双相钢连退板表面的主要富集元素有O、Mn和Si。沿着浅表层深度分析可知,对于合金元素含量较高的双相钢,沿浅表层富集更深,富集深度约为50 nm;而合金元素含量较低的铝镇静钢,富集深度仅约为25 nm。综合分析不难发现,相对于铝镇静钢,双相钢添加了Si元素以后在其表面优先富集Si元素并同时形成了Si的氧化物,从而导致Al元素的富集及氧化物的形成受到了抑制。 相似文献