Journal of Iron and Steel Research(International)最新文献_第10页

Multi-objective optimization of gas metal arc welding parameters and sequences for low-carbon steel (Q345D) T-joints 低碳钢(Q345D) t形接头气体保护焊参数及顺序多目标优化

2区材料科学

Journal of Iron and Steel Research(International) Pub Date : 2017-05-01 DOI: 10.1016/S1006-706X(17)30082-1

Qing Shao, Tao Xu, Tatsuo Yoshino, Nan Song

{"title":"Multi-objective optimization of gas metal arc welding parameters and sequences for low-carbon steel (Q345D) T-joints","authors":"Qing Shao, Tao Xu, Tatsuo Yoshino, Nan Song","doi":"10.1016/S1006-706X(17)30082-1","DOIUrl":"10.1016/S1006-706X(17)30082-1","url":null,"abstract":"<div><p>Q345D high-quality low-carbon steel has been extensively employed in structures with stringent welding quality requirements. A multi-objective optimization of welding stress and deformation was presented to design reasonable values of gas metal arc welding parameters and sequences of Q345D T-joints. The optimized factors included continuous variables (welding current (<em>I</em>), welding voltage (<em>U</em>) and welding speed (<em>v</em>)) and discrete variables (welding sequence (<em>S</em>) and welding direction (<em>D</em>)). The concepts of the pointer and stack in Visual Basic (VB) and the interpolation method were introduced to optimize the variables. The optimization objectives included the different combinations of the angular distortion and transverse welding stress along the transverse and longitudinal distributions. Based on the design of experiments (DOE) and the polynomial regression (PR) model, the finite element (FE) results of the T-joint were used to establish the mathematical models. The Pareto front and the compromise solutions were obtained by using a multi-objective particle swarm optimization (MOPSO) algorithm. The optimal results were validated by the corresponding results of the FE method, and the error between the FE results and the two-objective results as well as that between the FE results and the three-objective optimization results were less than 17.2% and 21.5%, respectively. The influence and setting regularity of different factors were discussed according to the compromise solutions.</p></div>","PeriodicalId":64470,"journal":{"name":"Journal of Iron and Steel Research(International)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1006-706X(17)30082-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84318545","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 27

Application of insulation padding in a heavy turbine guide vane casting 绝缘填料在大型涡轮导叶铸件中的应用

2区材料科学

Journal of Iron and Steel Research(International) Pub Date : 2017-05-01 DOI: 10.1016/S1006-706X(17)30075-4

Jin-wu Kang , Qing-xian Ma , Chi Zhang , Pei-chao Zhou , Zhong-ren Liu , Zu-liang Li , Hao Zhang

{"title":"Application of insulation padding in a heavy turbine guide vane casting","authors":"Jin-wu Kang , Qing-xian Ma , Chi Zhang , Pei-chao Zhou , Zhong-ren Liu , Zu-liang Li , Hao Zhang","doi":"10.1016/S1006-706X(17)30075-4","DOIUrl":"10.1016/S1006-706X(17)30075-4","url":null,"abstract":"<div><p>To replace metal padding by insulation padding for castings can save the melt and reduce cleaning work of castings. The design of insulation padding was investigated. The equation of the modulus extension factor for insulation padding and the ratio of its thickness over the modulus of a casting were improved to determine the thickness of insulation padding. The insulation padding was designed for a turbine guide vane casting weighing 3. 5 t. A sound casting was obtained with 750 kg steel saved. On the other side, the casting obviously expanded at the interface with the insulation padding, which is perhaps the reason that the use of insulation padding has been suspended for many years. To avoid the expansion of insulation padding, a shielding layer made of a kind of material of good fire resistance was adopted to prevent the insulation layer from touching the melt. The shielding layer serves as a cushion of heat and expansion during solidification process so as to resist the expansion of castings and guarantee the feeding effect at the same time. Furthermore, insulation padding can be placed by a certain offset into the mold cavity so as to counteract the expansion of castings.</p></div>","PeriodicalId":64470,"journal":{"name":"Journal of Iron and Steel Research(International)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1006-706X(17)30075-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85192305","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Effects of micro-alloying and production process on precipitation behaviors and mechanical properties of HRB600 微合金化和生产工艺对HRB600析出行为和力学性能的影响

2区材料科学

Journal of Iron and Steel Research(International) Pub Date : 2017-05-01 DOI: 10.1016/S1006-706X(17)30081-X

Hong-bo Pan , Meng-jiao Zhang , Wei-ming Liu , Jun Yan , Hui-ting Wang , Chang-sheng Xie , Zhan Guo

{"title":"Effects of micro-alloying and production process on precipitation behaviors and mechanical properties of HRB600","authors":"Hong-bo Pan , Meng-jiao Zhang , Wei-ming Liu , Jun Yan , Hui-ting Wang , Chang-sheng Xie , Zhan Guo","doi":"10.1016/S1006-706X(17)30081-X","DOIUrl":"10.1016/S1006-706X(17)30081-X","url":null,"abstract":"<div><p>Effects of micro-alloying elements and production process on microstructure, mechanical properties and precipitates of 600 MPa grade rebars were studied by using pilot test, metallographic observation, tensile test, thermodynamic calculation and transmission electron microscopy. The results show that the tested steels are composed of ferrite and pearlite, in which the content range of pearlite is 33%–45%. For vanadium micro-alloyed steel, interphase precipitation strengthening effect of V can be promoted and the yield strength of tested steels can be increased with increasing V content and decreasing finishing rolling temperature. The temperature of terminated cooling should be more than 700 °C when the water cooling is used. When niobium is added to the steel, more coarse (Nb, V) C, N precipitates are generated at high temperature, so that the solid solubility of precipitated phases of vanadium is reduced and the precipitation strengthening effect of vanadium is weakened.</p></div>","PeriodicalId":64470,"journal":{"name":"Journal of Iron and Steel Research(International)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1006-706X(17)30081-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80618632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Effect of Si on high temperature oxidation of 30Cr13 stainless steel Si对30Cr13不锈钢高温氧化的影响

2区材料科学

Journal of Iron and Steel Research(International) Pub Date : 2017-05-01 DOI: 10.1016/S1006-706X(17)30084-5

Hong-huan Mao, Xing Qi, Jing Cao, Li-cong An, Yi-tao Yang

引用次数: 17

Effect of vanadium on modification of inclusions in Mn- and Si-deoxidized steel during heat treatment at 1473 K 1473 K热处理过程中钒对锰、硅脱氧钢中夹杂物变质的影响

2区材料科学

Journal of Iron and Steel Research(International) Pub Date : 2017-05-01 DOI: 10.1016/S1006-706X(17)30079-1

Cheng-song Liu , Xiao-qin Liu , Hong-wei Ni , Shu-feng Yang , Jing-she Li , Fei Ye

{"title":"Effect of vanadium on modification of inclusions in Mn- and Si-deoxidized steel during heat treatment at 1473 K","authors":"Cheng-song Liu , Xiao-qin Liu , Hong-wei Ni , Shu-feng Yang , Jing-she Li , Fei Ye","doi":"10.1016/S1006-706X(17)30079-1","DOIUrl":"10.1016/S1006-706X(17)30079-1","url":null,"abstract":"<div><p>The effect of vanadium (V) on the modification of oxide inclusions in steels with different concentrations of Mn, Si, and V was determined before and after heat treatment at 1473 K. Changes in the morphology, size, and composition of these inclusions were analyzed. Equilibrium relations between the inclusions and steels at 1873 K and 1473 K were calculated using available thermodynamic data to roughly approximate the stable oxide inclusions in the steels. The results revealed that the concentrations of V and Si in the steel are critical for controlling the modification of the inclusions during heat treatment at 1473 K. MnO-SiO<sub>2</sub>-type oxide inclusions gradually transformed into MnO-V<sub>2</sub> O<sub>3</sub>-type or Mn-SiO<sub>2</sub>- and MnO-V<sub>2</sub>O<sub>3</sub>-type inclusions in low-Si high-V steels heat-treated for 60 min. In addition, the morphology of the inclusions changed from spherical to irregular. A Si-accumulated zone and a V-depleted zone formed close to the interface in the steel matrix. The experimental and calculation results indicated that, during the heat treatment, an interface chemical reaction occurred between the Fe-Mn-Si-V steel and the MnO-SiO<sub>2</sub>-type oxide inclusion.</p></div>","PeriodicalId":64470,"journal":{"name":"Journal of Iron and Steel Research(International)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1006-706X(17)30079-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78951261","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Heat transfer performance of porous titanium 多孔钛的传热性能

2区材料科学

Journal of Iron and Steel Research(International) Pub Date : 2017-05-01 DOI: 10.1016/S1006-706X(17)30083-3

Shi-feng Liu , An Li , Yao-jia Ren , Dong-feng Li , Zhao-hui Zhang

{"title":"Heat transfer performance of porous titanium","authors":"Shi-feng Liu , An Li , Yao-jia Ren , Dong-feng Li , Zhao-hui Zhang","doi":"10.1016/S1006-706X(17)30083-3","DOIUrl":"10.1016/S1006-706X(17)30083-3","url":null,"abstract":"<div><p>Porous titanium fibre materials with different structural parameters were prepared by vacuum sintering method. The thickness, porosity and wire diameter of prepared materials were investigated to understand the effects of structural parameters on pool heat transmission performance of titanium fibre porous material. As a result, better heat transfer performance is obtained when overheating is less than 10 °C. In addition, when the wire diameter is smaller, the heat transfer is better. However, when superheating is above 10 °C, heat transfer performance can be improved by increasing the wire diameter. Moreover, thickness influences the superficial area of the prepared material and affects the thermal resistance when bubbles move inside the material; superficial area and thermal resistance are the two key factors that jointly impact the heat transfer in relation to the thickness of the materials. Experimental results also show that the materials of 3 mm in thickness exhibit the best performance for heat transmission. Furthermore, changes in porosity affect the nucleation site density and the resistance to bubble detachment; however, the nucleation site density and the resistance to bubble detachment conflict with each other. In summary, the titanium fibre porous material with a 50% porosity exhibits suitable heat transfer performance.</p></div>","PeriodicalId":64470,"journal":{"name":"Journal of Iron and Steel Research(International)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1006-706X(17)30083-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91162321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Thermal analysis of walls in a new-type billet caster tundish with a vacuum shell 新型真空壳坯连铸机中间包壁热分析

2区材料科学

Journal of Iron and Steel Research(International) Pub Date : 2017-05-01 DOI: 10.1016/S1006-706X(17)30076-6

Jian-bo Xie , Jian-an Zhou , Lan-hua Zhou , Bao Wang , Hua Zhang

{"title":"Thermal analysis of walls in a new-type billet caster tundish with a vacuum shell","authors":"Jian-bo Xie , Jian-an Zhou , Lan-hua Zhou , Bao Wang , Hua Zhang","doi":"10.1016/S1006-706X(17)30076-6","DOIUrl":"10.1016/S1006-706X(17)30076-6","url":null,"abstract":"<div><p>To reduce thermal loss from molten steel in a tundish during continuous casting production, a new tundish fabricated by welding radiation-proof steel plates onto the steel plates of the exterior walls of a billet caster tundish was proposed. This new tundish was used to investigate the effect of pressures inside the vacuum chamber on the uniformity of the temperature of molten steel and the thermal conditions of the vacuum layer. The results show that the conversion radiation coefficient is not sensitive to pressure and its value at high temperatures is merely 1.5 times greater than that at low temperatures. Pressure is the key factor affecting additional factor of conversion convection. This factor is more than 100 times greater at 10<sup>5</sup> Pa than at 10<sup>2</sup> Pa, and the temperature at inner points at 10<sup>2</sup> Pa is, on average, 4 K higher than that at 10<sup>5</sup> Pa. Meanwhile, the local temperature difference of the inlet at 10<sup>2</sup> Pa is 1 K higher than that at 10<sup>5</sup> Pa. Thus, the proposed vacuum billet caster tundish can achieve low superheat teeming of steel because of the thermal preservation capability of the vacuum, which helps to reduce the tapping temperature and improve the uniformity of the temperature of steel.</p></div>","PeriodicalId":64470,"journal":{"name":"Journal of Iron and Steel Research(International)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1006-706X(17)30076-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72557841","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Microstructural evolution and mechanical properties of a new Ni-based heat-resistant alloy during aging at 750 °C 一种新型ni基耐热合金在750℃时效过程中的组织演变与力学性能

2区材料科学

Journal of Iron and Steel Research(International) Pub Date : 2017-05-01 DOI: 10.1016/S1006-706X(17)30078-X

Zhong-liang Tian , Sen-bao Jiang , Zheng-zong Chen , Han-sheng Bao , Zheng-dong Liu

{"title":"Microstructural evolution and mechanical properties of a new Ni-based heat-resistant alloy during aging at 750 °C","authors":"Zhong-liang Tian , Sen-bao Jiang , Zheng-zong Chen , Han-sheng Bao , Zheng-dong Liu","doi":"10.1016/S1006-706X(17)30078-X","DOIUrl":"10.1016/S1006-706X(17)30078-X","url":null,"abstract":"<div><p>Microstructural evolution and mechanical properties of a new candidate Ni-based heat-resistant alloy for advanced ultra-supercritical (A-USC) steam turbine rotors were investigated during aging at 750 °C up to 10000 h. The evolutions of γ′ particles inside austenitic grain and M<sub>23</sub> C<sub>6</sub> carbides along grain boundaries were characterized according to their morphologies, distributions, and growth kinetics. Mean radius of the γ′ spherical particles grew from 20.3 to 90.0 nm after aging for 10000 h, and the corresponding coarsening behavior was conformed to the law of Lifschitz-Slyosovd-Wagner (LSW). The weight fraction of γ′ particles slightly increased from 10.0 to 12.0 wt. % after aging of long duration at 750 °C. The Cr-rich M<sub>23</sub>C<sub>6</sub> carbides discontinuously precipitated along grain boundaries, while other detrimental phases were not formed during the aging treatment, and hence the strength of grain boundary was enhanced by these discontinuously distributed carbides. The critical size of γ′ had a direct influence on the maximum hardness of this alloy. Moreover, this alloy presented a good impact toughness for the safety after long time aging at high temperature.</p></div>","PeriodicalId":64470,"journal":{"name":"Journal of Iron and Steel Research(International)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1006-706X(17)30078-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85787018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Tailored properties of a novelly-designed press-hardened 22MnMoB steel 一种新设计的压硬化22MnMoB钢的定制性能

2区材料科学

Journal of Iron and Steel Research(International) Pub Date : 2017-05-01 DOI: 10.1016/S1006-706X(17)30077-8

Ming-bo Zhou , Jing-lin Tang , Jie Yang , Cun-yu Wang

引用次数: 8

Effects of process parameters on fragment and refinement of millimeter-grade coarse grains for 316LN steel during hot cogging 工艺参数对316LN钢热轧mm级粗晶破碎细化的影响

2区材料科学

Journal of Iron and Steel Research(International) Pub Date : 2017-05-01 DOI: 10.1016/S1006-706X(17)30080-8

Da-shan Sui , Hai-ming Zhang , Hong-yang Zhu , Zhe Zhu , Zhen-shan Cui

{"title":"Effects of process parameters on fragment and refinement of millimeter-grade coarse grains for 316LN steel during hot cogging","authors":"Da-shan Sui , Hai-ming Zhang , Hong-yang Zhu , Zhe Zhu , Zhen-shan Cui","doi":"10.1016/S1006-706X(17)30080-8","DOIUrl":"10.1016/S1006-706X(17)30080-8","url":null,"abstract":"<div><p>The heterogeneous mixed-grain microstructure is a common defect for the heavy forging of 316LN austenitic stainless steel. Isothermal compression experiments were performed on a Gleeble-3500 thermo-mechanical simulator to investigate the effect of process parameters on the fragment and refinement of millimeter-grade coarse grains (MCGs) during hot cogging. The experimental results indicate that the stress of MCG specimens is much larger than that of fine grain (FG) ones at 1150 °C, while the stress difference between MCG and FG samples became smaller at 1200 °C. Moreover, the MCGs can be well fragmented and refined under the condition of temperature of 1200 °C, strain rate of 0.01 s<sup>−1</sup>, and reduction rate of 50%. Meanwhile, numerical simulations were conducted to study the influences of temperature, strain and strain rate on microstructure evolution. The results of experiments and simulations comprehensively demonstrate that the MCG results in the increase of deformation resistance and incompatibility of deformation, and it can be fragmented and refined at 1200 °C so that the plastic deformation energy decreases remarkably with the increase of temperature from 1150 to 1200 °C.</p></div>","PeriodicalId":64470,"journal":{"name":"Journal of Iron and Steel Research(International)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1006-706X(17)30080-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85383047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3