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Interstitial Solution Carbon Concentration and Defects of Ti+Nb ULC-BH Steel by Internal Friction and Positron Annihilation Methods

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Journal of Iron and Steel Research International 2014年第1期21卷 91-97页

作者： Ji-ping CHEN yong-lin kang School of Metallurgical Engineering Key Laboratory of Metals and Processing of Anhui Province Anhui University of Technology School of Materials Science and Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology Beijing

The interstitial solution carbon concentration and defects in continuously annealed Ti＋Nb bearing ULC- BH （ultra-low carbon bake hardening） steel samples are investigated by multi-functional internal friction apparatus, positron annihilation lifetime spectroscopy （PALS） and coincidence Doppler broadening spectroscopy （CDBS）. The relationship of internal friction peaks, interstitial solution carbon concentrations and movable dislocations in the sam- ples under different conditions is analyzed. A correlation of lifetime component v~ values with interstitial solution car- bon concentrations in the samples for different continuous annealing processes is established, while a correlation of li- fetime component r2 values with multi-vacancies, vacancy clusters, microvoids and other types of defects for various continuous annealing processes is also demonstrated. Furthermore, the average lifetime results illustrate the overall defect densities for various continuous annealing processes. The CDBS analysis reflects the chemical surroundings of the defects at the annihilation sites and reveals that the peak heights of the ratio curves relate to the total number of defects such as interstitial carbon atoms, dislocations, vacancies and other types of defects. The results show that in- ternal friction, PALS and CDBS are effective techniques to identify and characterize the interstitial solution carbon concentration, multi-vacancies, vacancy clusters, microvoids and other types of microscopic defects in annealed Ti＋ Nb bearing ULC-BH steel.

关键词： ULC-BH steels internal frictions positron annihilation lifetimes coincidence Doppler broadening

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Influence of coating and dew point on hearth roll pickup

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Journal of Iron and Steel Research International 2019年第6期26卷 647-652页

作者： Xiao-fei Zheng yong-lin kang Jian Zhou School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Shougang Jingtang Iron and Steel United Co. Ltd. Tangshan 063200 Hebei China

Thermal spray coatings have been widely used on hearth rolls in a continuous annealing line to improve steel sheet quality and prolong the roll service life. One of the common defects formed on a working hearth roll is the oxide pickup. The most common cause of the pickup formation is that the active Mn oxide reacts with coating. The potentials of two different coatings, CoCrAlYTa-Al2O3 (No. 1) and CoCrYNi-Y2O3 (No. 2), to duplicate pickups by reacting with Fe and Mn oxides were studied. There are three stages during pickup producing and growing. No. 2 coating effectively reduced the corrosion of Mn oxide. The characterization and modification of the surface oxide formed can be changed with different dew points. The results indicate that the dew point from — 53 to — 10 ℃ can change the depth of Mn oxide, such that an alteration can prevent the first stage and second stage and is good for preventing the pickup growing.

关键词： Pickup Coating Dew point Surface oxide Hearth roll

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Stress-strain partitioning analysis of constituent phases in dual phase steel based on the modified law of mixture

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International Journal of Minerals,Metallurgy and Materials 2009年第4期16卷 393-398页

作者： Shuang Kuang yong-lin kang Hao Yu Ren-dong Liu School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Technology Center Anshan Iron ＆ Steel Group Corporation Anshan 114001 China

A more accurate estimation of stress-strain relationships for martensite and ferrite was developed, and the modified law of mixture was used to investigate the stress-strain partitioning of constituent phases in dual phase （DP） steels with two different martensite volume fractions. The results show that there exist great differences in the stress-strain contribution of martensite and ferrite to DP steel. The stress-strain partitioning coefficient is not constant in the whole strain range, but decreases with increasing the true strain of DP steel. The softening effect caused by the dilution of carbon concentration in martensite with the increase of martensite volume fraction has great influence on the strain contribution of martensite. The strain ratio of ferrite to martensite almost linearly increases with increasing the true strain of DP steel when the martensite volume fraction is 22%, because martensite always keeps elastic. But the strain ratio of ferrite to martensite varies indistinctively with the further increase in true strain of DP steel above 0.034 when the martensite volume fraction is 50%, because plastic deformation happens in martensite. The stress ratio ofmartensite to ferrite decreases monotonously with increasing the true strain of DP steel whether the martensite volume fraction is 22% or 50%.

关键词： stress and strain partitioning dual phase steel ferrite martensite

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Effect of continuous annealing parameters on the mechanical properties and microstructures of a cold rolled dual phase steel

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International Journal of Minerals,Metallurgy and Materials 2009年第2期16卷 159-164页

A cold rolled dual phase （DP） steel with the C-Si-Mn alloy system was trial-produced in the laboratory, utilizing a Gleeble-3800 thermal simulator. The effects of continuous annealing parameters on the mechanical properties and microstructures of the DP steel were investigated by mechanical testing and microstructure observation. The results show that soaking between 760 and 820℃ for more than 80 s, rapid cooling at the rate of more than 30℃/s from the quenching temperature between 620 and 680℃, and overaging lower than 300℃ are beneficial for the mechanical properties of DP steels. An appropriate proportion of the two phases is one of the key factors for the favorable properties of DP steels. If the volume fraction of martensite and, thereby, free dislocations are deficient, the tensile strength and n value of DP steels will decrease, whereas, the yield strength will increase. But if the volume fraction of martensite is excessive to make it become a dominant phase, the yield and tensile strength will increase, whereas, the elongation will decrease obviously. When rapid cooling rate is not fast enough, pearlite or cementite will appear, which will degrade the mechanical properties. Even though martensite is sufficient, if it is decomposed in high temperature tempering, the properties will he unsatisfied.

关键词： austenization intercritical annealing dual phase steel cold rolling diffusion

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Influence of Residual Stress on Shape of Heavy-gauge,High-strength Steel Caused by Cooling Process after Hot Rolling

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Journal of Iron and Steel Research International 2016年第6期23卷 547-552页

作者： Shui-ze WANG yong-lin kang Guo-ming ZHU Wen LIANG School of Materials Science and Engineering University of Science and Technology Beijing Research and Development Center Wuhan Iron & Steel(Group)Co.Ltd.

The cooling process following hot rolling has a significant effect on the shape quality of a hot-rolled *** temperature and stress fields in the cooling process for a 14 mm thick strip with yield strength of 500 MPa grade were analyzed by the finite element method and actual test data,and the relationship between residual stress and shape defects was ***,the small-crown rolling process and the coil slow cooling process were *** results indicate that these processes improved the shape quality of the final product significantly.

关键词： rolling strip flatness gauge rolled crown thick tensile buckling defects

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Effects of Nb on the microstructure and mechanical properties of 38MnB5 steel

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International Journal of Minerals,Metallurgy and Materials 2018年第10期25卷 1181-1190页

作者： Li lin Bao-shun Li Guo-ming Zhu yong-lin kang Ren-dong Liu School of Material Science and Engineering University of Science and Technology BeijingBeijing 100083China Ansteel Technology Center Anshan 114009China

The effects of the microalloying element niobium(Nb) on the microstructure and mechanical properties of the hot stamped steel 38 Mn B5 were investigated. The impact of Nb addition on the microstructure was studied through scanning electron microscopy(SEM), transmission electron microscopy(TEM), and X-ray diffraction(XRD). The experimental results indicated that the microstructures of the steel containing Nb were finer than those of the steel without Nb. Moreover, Nb mainly presented as a second-phase particle in 38MnB5 steel, and the particles included Nb carbonitrides. In addition, the tensile strength and elongation of the hot rolled and hot stamped steels were also measured, and they demonstrated that the appropriate addition of Nb was beneficial to the mechanical properties of 38 MnB5. Under the same conditions, the tensile strength of 38 MnB5 Nb was higher than that of 38 MnB5, which increased from 2011 to 2179 MPa. The yield strength also increased from 1316 to 1476 MPa, and the elongation increased from 5.92% to 6.64%. Overall, Nb had a positive effect on the performance of the hot stamped steel.

关键词： hot stamping steel CCT curve microstructure mechanical properties precipitation

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Flexible manufacturing technology of controlling exact bake hardening value in continuous galvanizing line

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Journal of Iron and Steel Research International 2018年第12期25卷 1296-1302页

作者： Xiao-fei Zheng yong-lin kang Bao-yong Wang Zhi-gang Han Xin-Iong Luo School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Shougang Jingtang Iron and Steel United Co. Ltd. Tangshan 063200HebeiChina

Flexible manufacturing technology for ultra-low-carbon bake hardening (BH)steels with different solute carbon contents in the range of (6-16)× 10^-4 wt.%was systematically *** effects of soaking temperature,cooling rate and aging time on solute carbon content were *** bake hardening value in a continuous galvanizing line with an over-aging section was *** manufacturing parameters were calculated using the design of experiment to obtain the best and most flexible process *** indicate a relationship among carbon content,soaking temperature and cooling *** solute carbon is 9 × 10^-6,cooling rate is 50 ℃/s,the soaking temperature is 745 ℃,and BH value is 45 MPa,the requirements of an automobile factory can be met.

关键词： Bake hardening value Solute carbon content Aging time Soaking temperature Cooling rate

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Precipitation Behavior of Cu-1.9Be-0.3Ni-0.15Co Alloy During Aging

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Acta Metallurgica Sinica(English Letters) 2015年第3期28卷 307-315页

作者： Yan-Chuan Tang yong-lin kang Li-Juan Yue Xiao-Liang Jiao School of Materials Science and Engineering University of Science and Technology Beijing CNMC Ningxia Orient Group Co. Ltd.

In this paper,the evolutions of microstructure and mechanical properties of Cu-l.9Be-0.3Ni-0.15Co alloy were *** alloys in the condition of the solution treated（soft state） and 37% cold rolled（hard state） were aged at 320 ℃for different time,*** mechanical properties,electrical conductivity and microstructure of the alloy aged for different time were ***,the precipitation kinetics of Cu-1.9Be-0.3Ni-0.15Co alloys was investigated.X-ray diffraction and transmission electron microscopy results reveal that both continuous precipitation and discontinuous precipitation existed in the hard-state Cu-l.9Be-0.3Ni-0.15Co alloy during the whole aging process;the sequence of continuous precipitation is *** →γ″→γ′→γ.Furthermore,the precipitation transformation mechanism of softstate alloy is homogeneous nucleation,while hard-state alloy shows the heterogeneous nucleation（interface nucleation）with the nucleation rate of both states decaying rapidly to zero during aging at 320 ℃.

关键词： Cu-1.9Be-0.3Ni-0.15Co alloy Aging Microstructure Mechanical property Electrical property Precipitation kinetics

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Investigation on inductive heating of A356 alloy for thixo-forming

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International Journal of Minerals,Metallurgy and Materials 2009年第3期16卷 309-313页

作者： Kai-kun Wang Jian-lin Sun yong-lin kang Qi Zhang Lei Yang Chun-mei Ma School of Materials Science and Engineering University of Science and Technology Beijing 100083 Beijing China East-China Micro-electronic Institute of Technology 230022 Hefei China

To meet the demands of continuous stream-line for component production in the thixo-forming industry, billet heating should be of high quality and in a controllable way. A 4-step inductive heating strategy for aluminum alloy A356 was performed. Thixotropic testing and microstructure analysis showed that a homogenous temperature distribution was achieved after temperature-power-time optimization. Theoretical analysis was given concerning the thermal conductivity and heat capacity of A356 between conventional and semisolid casting microstructures. The experimental results show that the optimized 4-step strategy could be the best strategy for billet heating during the thixo-forming of aluminum alloy A356.

关键词： Thixo-forming aluminum alloys inductive heating temperature distribution

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High-temperature properties and microstructure of Mo microalloyed ultra-high-strength steel

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International Journal of Minerals,Metallurgy and Materials 2011年第4期18卷 407-412页

作者： Qi-hang Han yong-lin kang Xian-meng Zhao Lu-feng Gao Xue-song Qiu School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 China

The high-temperature mechanical properties and microstructure of forging billets of C-Si-Mn-Cr and C-Si-Mn-Cr-Mo ultra-high-strength cold-rolled steels（tensile strength≥1000 MPa,elongation≥10%） were *** the comparison of reduction in area and hot deformation resistance at 600-1300°C,the Mo-containing steel was found to possess a higher strength and a better plasticity than the Mo-free *** equilibrium phase diagram and atom fraction of Mo in different phases at different temperatures were calculated by Thermo-Calc software（TCW）.The results analyzed by using transmission electron microscopy and TCW show that precipitates in the Mo-containing steel are primarily M23C6,which promote pearlite *** experimental data also show that a lower ductility point existing in the Mo-free steel at 850°C is eliminated in the Mo-containing *** is mainly due to the segregation of Mo at grain boundaries investigated by electron probe microanalysis（EPMA）,which improves the strength of grain boundaries.

关键词： high strength steels high temperature properties microstructure molybdenum thermodynamics

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