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Wang .,Shanghai University | Zhang M.,Shanghai University | Xiong W.,Shanghai University | Liu R.,Ansteel Group Corporation | And 2 more authors.
Materials and Design | Year: 2015

Microstructure and tensile properties of the laser welded joint of Fe-18.8Mn-0.6C TWIP steel were investigated in this research. The microstructure of fusion zone (FZ) was characterized by means of X-ray diffraction (XRD), transmission electron microscope (TEM) and scanning electron microscope (SEM). TEM and in-situ SEM observation were employed to investigate the microstructural evolution and strengthening mechanism of FZ during deformation. The welded joint with a fully austenitic structure was obtained by the laser welding. The granular divorced eutectic phases (Fe, Mn)3C and inclusions formed in the interdendritic regions during the solidification of FZ. The fully austenitic structure and coarse dendrite grains were responsible for the fracture at the weld seam. The FZ exhibited a good combination of strength (e.g. tensile strength up to 1000MPa) and ductility (e.g. total elongation up to 73%). The microstructural evolution revealed that dislocation slip was the main deformation mechanism at low strains of FZ, while at relatively high strains, mechanical twinning was the domain deformation mechanism and played an important role in improving the strength and ductility as well as the work-hardening effect of FZ. © 2015 Elsevier Ltd.


Tang L.-X.,University Of Science And Technology Liaoning | Zhang D.,Ansteel Group Corporation | An Z.-T.,University Of Science And Technology Liaoning | Zhang J.-Y.,University Of Science And Technology Liaoning
Applied Mechanics and Materials | Year: 2014

The special advantages of Soundless Crack method are safety and environmental protection. Soundless Crack is widely used in stone exploitation, partly crack of brittleness materials such as rock and concrete, and backout of building in city. In these engineering, we must drill many holes for loading Soundless Cracking Agents, but the drilling cost is expensive including human cost and materials cost, at the same time need much time to drill these holes. So we hope to gain the best crack results at the minimum drillhole numbers. This paper used RFPA software to set up some models with different drillhole numbers, gained different failure process of models. Adopted different drilling plan will occur different results. We should drill more holes if we need partly crack smoothly. We can plan the number of drillholes based on our need if we can use RFPA to simulate the failure process before beginning. © (2014) Trans Tech Publications, Switzerland.


Lin Y.,University Of Science And Technology Liaoning | Lin Y.,Angang Steel | Tang F.-P.,Ansteel Group Corporation | Shen M.-G.,University Of Science And Technology Liaoning | And 3 more authors.
Kang T'ieh/Iron and Steel | Year: 2016

An investigation on decarburization by carbonate decomposition of CO2 in RH process has been put forward. By means of spraying calcium carbonate powder into molten steel from the upper snorkel, the decarburization reaction and purifying molten steel were promoted. The decarburization mechanism of this novel technique has been analyzed. The industrial experiments have been carried out to investigate the variation of the cleanness of molten steel before and after the treatment. The results indicate that decarburization reaction took place after carbonate decomposition of CO2 decarburization treatment and decarburization process was accelerated, which led to shorten at least 3 min for the RH processing time and reduce 3-5 RMB for the production cost per ton steel. w(T[O]) in the as-cast slab approached to 0.0010% after non-oxygen promoting decarburization treatment, which improved the cleanness of the molten steel significantly. © 2016, CISRI Boyuan Publishing Co., Ltd. All right reserved.


Sun J.-D.,Angang Steel | Huang X.-Y.,Ansteel Group Corporation | Du X.-E.,Angang Steel
Kang T'ieh/Iron and Steel | Year: 2015

In recent years, the campaign life of China blast furnaces has made a great progress, and some of them have reached international level. However, dozens of blast furnace hearth accident or abnormal corrosion occurred. Blast furnace longevity is a comprehensive technology. To realize blast furnace longevity scientific and reasonable design is the key, meanwhile monitoring and maintenance is the basis. According to the investigation on longevity technology application and hearth corrosion of many blast furnaces, the hearth corrosion reasons are analyzed in terms of design, operation, etc. On this basis, some optimization principle and measures on operation, monitoring, maintenance, are put forward to realize hearth longevity. ©, 2015, Chinese Society for Metals. All right reserved.


Cai H.-J.,University of Science and Technology Beijing | Cai H.-J.,Ansteel Group Corporation | Hu J.-F.,University of Science and Technology Beijing | Song R.-B.,University of Science and Technology Beijing | Dai Q.-F.,University of Science and Technology Beijing
Gongcheng Kexue Xuebao/Chinese Journal of Engineering | Year: 2016

The Hopkinson experiment system was used to do the dynamic tensile experiment of 800 MPa grade cold rolled dual phase steel (DP800). The strain rate was determined as 500, 1000 and 2250 s-1. By comparing the experimental results, both the yield strength (Rp0.2) and the tensile strength (Rm) of the dual phase steel increase with strain rate in the exponential form. The plastic deformation at high strain rate leads to adiabatic temperature rise effect. The adiabatic temperature rise is 89℃ at the 2250 s-1 strain rate. Based on the J-C (Johnson-Cook) model and Z-A (Zerilli-Armstrong) model, the constitutive model of the dual phase steel was researched. The quadratic polynomial of strain rate effect of the J-C model was modified. The average coefficient of determination increases from 0.9228 to 0.9886 by modifying the J-C model. © All right reserved.


Wang X.-F.,Ansteel Group Corporation | Tang F.-P.,Ansteel Group Corporation | Li Z.,Ansteel Group Corporation | Lin Y.,Ansteel Group Corporation | And 2 more authors.
Kang T'ieh/Iron and Steel | Year: 2014

Decreasing the total oxygen content and the inclusion removal is the key technique to produce the high purity steel. A novel cleanness steel production technology due to the dispersed in-situ phase induced by the composite ball explosion reaction has been put forward. A composite ball with this function has been designed and prepared using a laboratory model batch type balling disc and the industrial experimental investigations have also been carried out. The results indicate that this novel technique is a low-cost and high efficiency cleanness steel production method, which can realize quick slag forming, fast dephosphorization and fine inclusion removal. Temperature drop during transferring is small. The heat-up rate during LF has been increased for more than 2℃/min and the refining period has been shorten for 3-8 min. Average total oxygen in the as-cast slab can be decreased from 14.2×10-6 to 9.69×10-6. The lowest phosphorous in the casting bland can approach to 30×10-6 after its treatment.


Tang F.,Ansteel Group Corporation | Zhang Z.,Ansteel Group Corporation | Xu F.,Ansteel Group Corporation | Lin Y.,Ansteel Group Corporation | And 4 more authors.
Proceedings of the 6th International Congress on the Science and Technology of Steelmaking, ICS 2015 | Year: 2015

A novel decarburization process in RH degassing vacuum (named as RH-AS) has been put forward and the plant trials have been carried out and the ruling factors of the decarburization process of RH-AS have been analyzed. The results indicate that decarburization reaction can take place after RH-AS treatment and decarburization process can be accelerated, which results in the decarburization period shortening for at least 3 min. Enlargement of interfacial area was considered to be the main decarburization mechanism.

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