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Effect of Overaging on Solute Distributions and Bake Hardening Phenomenon in Bake Hardening Steels 被引量:3
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作者 WANG Hua SHI Wen +2 位作者 HE Yan-lin LU Xiao-gang LI Lin 《Journal of Iron and Steel Research International》 SCIE CAS CSCD 2012年第1期53-59,共7页
Specimens of two different kinds of bake hardening steels (BH-Mn and BH-P) were prepared and treated with different annealing processes (water quenching and overaging). A novel technique of three dimensional atom ... Specimens of two different kinds of bake hardening steels (BH-Mn and BH-P) were prepared and treated with different annealing processes (water quenching and overaging). A novel technique of three dimensional atom probe was used to investigate solute distributions in these steels. The results indicate that C concentration decreases, whereas V increases during overaging in both bake hardening steels. The conclusion that no vanadium carbides pre- cipitate during the overaging is therefore originally obtained by microanalysis in bake hardening steels. Moreover, bake hardening values of all the specimens were tested by tensile experiments with 2 0/~ pre-deformation. However, those of overaged specimens were further measured with higher levels of pre-deformation because no bake hardening phenomenon was present at 2% pre-deformation. As the pre-deformation increases from 2% to 6% and 8%, both overaged steels show bake hardening values, and the value data are almost the same. 展开更多
关键词 ultra-low carbon bake hardening steel three dimensional atom probe solute C water quenching overaging bake hardening phenomenon
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Evolution of appearance profile of hot-dip galvanized car-body steel sheet during deformation process
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作者 ZHAO Yanliang SHI Jinzhong DAI Yigang 《Baosteel Technical Research》 CAS 2017年第2期30-36,共7页
In recent years, the waterborne free intermediate coating process has been widely used in the automotive industry. Because the baking times and coating thickness are decreased, the surface covering capability of the p... In recent years, the waterborne free intermediate coating process has been widely used in the automotive industry. Because the baking times and coating thickness are decreased, the surface covering capability of the painting process is reduced, which directly affects the appearance quality( long-and short-wave values) of the body paint. Thus, there are correspondingly higher requirements for the white body surface profile prior to painting. The surface profile of the white body is mainly affected by the plate material, the surface profile, and the deformation process. So,the change rule for the surface profile during deformation of the steel plate is a key factor in coating appearance optimization. In this paper, we first analyze the typical deformation of the outer cover of a car body. Then ,we examine the change tendency of the surface profile of steel plates with respect to different deformation rates, specifically for a steel plate comprising a hot-dip galvanized bake-hardened steel sheet. Based on our analysis of the influence of the deformation on the coating appearance,we selected 3% ,5% ,and 8% deformation rates in this research. We found the roughness (Ra) value in the typical deformation range (3% -8% ) of the car body to exhibit a decreasing trend at first and then an increasing trend. The Ra value of the 8% deformation is not more than the original plate test value. When the Pc value of the original plate is in the lower range ( about 60), it exhibits a slight increasing trend in the deformation process (3 % -8 % ). And when the Pc value of the original plate is in the higher range ( about 120 ), it exhibits no increasing trend in the deformation process ( 3% -8% ). In contrast,the waviness (WCA) value in the car body's typical deformation range (3%-8%) shows a significant growth trend. 展开更多
关键词 automotive coating hot-dip galvanized steel sheet bake hardened steel deformation ROUGHNESS WAVINESS
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Microstructure and Properties of Ti and Ti+Nb Ultra-Low-Carbon Bake Hardened Steels 被引量:7
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作者 CHEN Ji-ping KANG Yong-lin +2 位作者 HAO Ying-min LIU Guang-ming XIONG Ai-ming 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2009年第6期33-40,共8页
Hot rolling, cold rolling and continuous annealing processes of Ti bearing and Ti+ Nb stabilized ultra-low-carbon bake hardened steels were experimentally studied. The microstructure and texture evolution, as well as... Hot rolling, cold rolling and continuous annealing processes of Ti bearing and Ti+ Nb stabilized ultra-low-carbon bake hardened steels were experimentally studied. The microstructure and texture evolution, as well as the morphology, size and distribution of second phase precipitates during hot rolling, cold rolling and continuous annealing were also analyzed. The results showed that the size of NbC precipitates in Ti+Nb stabilized ultra-low-carbon bake hardened steel was smaller than that of TiC precipitates in Ti bearing ultra-low-carbon bake hardened steel, which made the average grain size of Ti+ Nb stabilized ultra-low-carbon bake hardened steel finer than that of Ti bearing ultra-low-carbon bake hardened steel; for the yield strength, the former was higher than the latter; but for the r value which reflects the deep-drawing performance, the former was lower than the latter. 展开更多
关键词 ultra-low-carbon bake hardened steel TEXTURE microstructure mechanical property
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Strain Limit of Extra Galvannealed Interstitial-Free and Bake Hardened Steel Sheets Under Different Stress Conditions 被引量:2
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作者 R Narayanasamy N L Parthasarathi +1 位作者 R Ravindran C Sathiya Narayanan 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2008年第5期56-60,共5页
The formability of bake hardened steel (thickness 0.82 mm), and the extra galvannealed IF steel (thickness 0.82 mm) have been studied. The suitability of the above steels for forming applications has been critical... The formability of bake hardened steel (thickness 0.82 mm), and the extra galvannealed IF steel (thickness 0.82 mm) have been studied. The suitability of the above steels for forming applications has been critically examined. The microstructure, tensile properties, and formability parameters of the above sheet metals were determined. The manufacturing process of the steels and the significance with reference to its formability were studied. 展开更多
关键词 bake hardened steel extra galvannealed IF steel microstructure forming limit diagram tensile parameter
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Effects of Rolling Parameters on Texture and Formability of High Strength Ultra-Low Carbon BH Steel 被引量:2
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作者 CHEN Yin-li SU Lan +3 位作者 ZHAO Ai-min KUAI Zhen LI Ben-hai LIU Guang-ming 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2013年第6期75-81,共7页
The effects of hot rolling and cold rolling parameters on texture and r ( plastic strain ratio ) value of high strength ultra low carbon bake hardening ( ULC-BH ) steels are studied with orientation distribution f... The effects of hot rolling and cold rolling parameters on texture and r ( plastic strain ratio ) value of high strength ultra low carbon bake hardening ( ULC-BH ) steels are studied with orientation distribution function ( ODF ) structural analysis method.After hot rolling , the high strength ULC-BH steel sheet has weakγ-fiber with uniform orientation distributions , and weakα-fiber , of which { 445 } component forms a high intensity peak at coiling temperature of 750℃.After cold rolling , both { 111 } -{ 111 } intensity on theγ-fiber and{ 111 -}{ 112 } intensity on theα-fiber enhanced.As a result of substitutional solute elements Mn and P being added to the steel , strong { 112 } deformation texture component is observed onα-fiber , especially at 80%cold rolling reduction , and this leads to the strong { 111 } recrystallization texture after annealing.The increase of cold rolling reduction shifts the maximum intensity on theγ-fiber from { 111 } to { 111 } .After annea-ling , a very strongγ-fiber is obtained , with intensity peak at { 111 } component when cold rolling reduction reaches 80%.Increasing coiling temperature and cold rolling reduction improveγ-fiber intensity and r value , resulting in good deep drawability. 展开更多
关键词 hot rolling cold rolling TEXTURE bake hardening steel
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Resistance Spot Weldability of Dissimilar Materials: BH180-AISI304L Steels and BH180-IF7123 Steels 被引量:1
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作者 Fatih Hayat 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2011年第11期1047-1058,共12页
In this study, resistance spot weldability of 180 grade bake hardening steel (BH180), 7123 grade interstitial free steel (IF7123) and 304 grade austenitic stainless steel (AISI304L) with each other was investiga... In this study, resistance spot weldability of 180 grade bake hardening steel (BH180), 7123 grade interstitial free steel (IF7123) and 304 grade austenitic stainless steel (AISI304L) with each other was investigated. In the joining process, electrode pressure and weld current were kept constant and six different weld time were chosen. Microstructure, microhardness, tensile-shear properties and fracture types of resistance spot welded joints were examined. In order to characterize the metallurgical structure of the welded joint, the microstructural profile was developed, and the relationship between mechanical properties and microstructure was determined. The change of weld time, nugget diameter, the HAZ (heat affected zone) width and the electrode immersion depth were also investigated. Welded joints were examined by SEM (scanning electron microscopy) images of fracture surface. As a result of the experiment, it was determined that with increasing weld time, tensile shear load bearing capacity (TLBC) increased with weld time up to 25 cycle and two types of tearing occurred. It was also determined that while the failure occurred from IF side at the BHIS0+IF7123 joint, it occurred from the BH180 side at the BHIS0+AISI304L joint. 展开更多
关键词 Resistance spot welding bake hardening steel Interstitial free steel Stainless steel
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