Improvement of carbon segregation in cast bloom and heredity in hot-rolled bar

2021 ◽  
Vol 118 (6) ◽  
pp. 610
Author(s):  
Mengyun Zhang ◽  
Yanping Bao ◽  
Lihua Zhao ◽  
Xin Li
Keyword(s):  
Casting Speed ◽  
Reduction Process ◽  
Rolling Process ◽  
Solidification Structure ◽  
Soft Reduction ◽  
Carbon Segregation ◽  
The Core ◽  
Before And After ◽  
Core Areas ◽  
Hot Rolled

In this study, the effect of mechanical soft reduction on carbon segregation in the continuous casting of 300 × 400 mm 42CrMo alloy structural steel blooms was comparatively investigated by adjusting the casting speed, which was systematically optimized through numerical simulation. When the casting speed is 0.60 m · min−1, during the soft reduction process, the central solidification structure of the bloom becomes dense, and carbon segregation is improved. Moreover, the distribution of carbon in the samples before and after rolling was analyzed. Combined with the soft reduction process, the uniformity of carbon across the cross section of the bloom /bar distinctly improved for casting speeds of 0.50 m · min−1, 0.55 m · min−1 and 0.60 m · min−1, this was predominantly reflected in the core areas. The effective segregation length proportion of the bloom and rolled bar is approximately 40%. This phenomenon fully verifies the heredity characteristics of the elements in the rolling process.

Analysis of Microstructures and XRD of a Gradient Boron Alloyed Composite Material

2013 ◽  
Vol 680 ◽  
pp. 113-118
Author(s):  
Guo Liang Xie ◽  
Qiang Song Wang ◽  
Xu Jun Mi ◽  
Bai Qing Xiong ◽  
Jing Tao Han ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Composite Material ◽  
Hot Rolling ◽  
Rolling Process ◽  
The Core ◽  
The Matrix ◽  
New Type ◽  
And Performance ◽  
Hot Rolled ◽  
Stainless Steel Coatings

A new type of gradient boron alloyed composite material, containing boron alloyed core layers and stainless steel coatings around the core, were designed and prepared by composite casting and hot rolling. The evolution of microstructures, phases and precipitations, as well as their influence on hot rolling process and performance are investigated. A mixture of austenitic matrix and uniformly distributed borides are obtained in the hot rolled stainless steel with 2-2.5 % boron, while massive borides are in the length of 80-120 μm together with micro gaps at the interface between the borides, and the matrix is remained after hot rolling for the core layers with higher boron contents. Hot deformation would be hindered since more precipitations of these orthorhombic or tetragonal phases occur with an increase of the boron concentration in the core layers.

High-efficiency continuous casting of GCr15 bearing steel bloom based on cooperative control technique of complex electromagnetic stirring and soft reduction

2019 ◽  
Vol 116 (6) ◽  
pp. 621 ◽  
Author(s):  
Hanghang An ◽  
Yan Ping Bao ◽  
Min Wang ◽  
Quan Yang ◽  
Xiang Hong Wang ◽  
...  
Keyword(s):  
Continuous Casting ◽  
Casting Speed ◽  
Bearing Steel ◽  
Average Degree ◽  
Electromagnetic Stirring ◽  
Control Technique ◽  
Internal Quality ◽  
Soft Reduction ◽  
Carbon Segregation ◽  
Gcr15 Bearing Steel

GCr15 bearing steel exhibits comparatively serious center macro-segregation in the continuous casting of bloom with the increase of casting speed. In the present work, the influence of complex electromagnetic stirring (M + F-EMS) and mechanical soft reduction (MSR) on the center macro-segregation in the continuous casting of 220 × 260 mm blooms of GCr15 bearing steel have been comparatively investigated to increase casting speed in order to ensure a good internal quality. Based on numerical simulation and experiments, M + F-EMS and MSR have been comprehensively evaluated and compared by combination of industrial trials. The results show that center carbon segregation first decreases and then increases with the increase of casting speed in both processes without optimization. For M + F-EMS process, when casting speed increases from 0.75 to 0.85 m · min−1, the average degree of center carbon segregation decreases from 1.2 ∼ 1.26 to 1.18 ∼ 1.25 by asymmetrical optimization; with regard to combination of M + F-EMS and MSR process, when casting speed increases from 0.75 to 0.9 m · min−1, the average degree of center carbon segregation decreases from 1.2 ∼ 1.26 to 1.08 ∼ 1.1 and the solute element distribution becomes homogeneous by optimization. In comparison, significant reduction of the center macro-segregation with the increase of casting speed can be achieved for combination of M + F-EMS and MSR process, however, it is infeasible for M + F-EMS process in the present technology situation.

Nilai-Nilai Pendidikan Akhlak dalam Al-Qur’an

2018 ◽  
Vol 10 (2) ◽  
pp. 269-295
Author(s):  
Sri Waluyo
Keyword(s):  
Moral Education ◽  
Primary Source ◽  
Secondary Data ◽  
Primary Data ◽  
The Core ◽  
Primary Data Source ◽  
Before And After ◽  
Data Source

This paper discusses the content of Q.S. al-Baqarah ([2]: 67-73). The data used in the preparation of this paper is the data that is primary and secondary. The primary source is data obtained from the core source. In conducting a study of a verse, it is clear that the primary data source is derived from the Qur'an,precisely on Q.S. al-Baqarah ([2]: 67-73). Secondary data is dataobtained from other sources that are still related to the problemand provide interpretation of the primary source. The method usedin analyzing this paper is the tahlili method. This method describesthe meaning contained by the Qur'an, verse by verse, and letterafter letter according to the order in the Mushaf. The descriptionincludes the various aspects which the interpreted verses contain,such as the meaning of the vocabulary, the connotation of thesentence, the background of the verse down, its relation to otherverses, both before and after. And do not miss the opinion that hasbeen given regarding the interpretation of these verses, whetherdelivered by the Prophet, companions, the tabi'in, as well as othercommentators. This study shows that in Q.S. (2): 67-73) there arevalues of moral education which include: 1) morals in asking, (2)morals to parents, (3) patience of educators, (4) educator honesty,and (5) obedience of learners.

DIVERSITY AND DISTRIBUTION OF ORIBATID MITE FAUNA(ACARI: ORIBATIDA) IN THE FOREST FLOOR OF SATKOSIA BASIPALLY WILD LIFE SANCTUARY, ODISHA, INDIA

2017 ◽  
Vol 23 (1) ◽  
Author(s):  
SHELLEY ACHARYA ◽  
ADITI DUTTA
Keyword(s):  
Forest Floor ◽  
Dominant Species ◽  
Oribatid Mite ◽  
Soil Condition ◽  
Silica Content ◽  
Soil Mites ◽  
The Core ◽  
Humid Condition ◽  
Core Areas ◽  
Wild Life

The studies were mostly concentrated in Nine forest ranges of the WLS including the core areas. The soil of this region mostly is dry, red and with iron and silica content. Though the soil mites are prevalent in moist humid condition, we got a diversed population of 20 different species under 14 genera which is less than average probably due to the soil condition. Protoribates magnus is the dominant species in this study. The species with larger ranges were Scheloribates curvialatus.

Rights, Authority, and Workability: An Examination of Universal Jurisdiction

2019 ◽  
Vol 3 ◽  
pp. 7-17
Author(s):  
Srdan Durica
Keyword(s):  
Universal Jurisdiction ◽  
Scholarly Work ◽  
Contemporary State ◽  
The Core ◽  
Core Areas ◽  
The Subject

In this paper, I conceptualize ‘universal jurisdiction’ along three axes: rights, authority, and workability to reduce the compendium of scholarly work on the subject into three prominent focus areas. I then review the longstanding debates between critics and supports, and ultimately show the vitality of this debate and persuasiveness of each side’s sets of arguments. By using these three axes as a sort of methodological filter, one can develop a richer understanding of universal jurisdiction, its theoretical pillars, practical barriers, and the core areas of contention that form the contemporary state of knowledge.

scholarly journals Variations of microstructure and resistance to fish-scaling of a hot rolled enamel steel before and after enamel firing

2021 ◽  
Vol 11 ◽  
pp. 466-473
Author(s):  
Xueqi Huang ◽  
Zhimin Zhang ◽  
Xianghua Liu ◽  
Yang Zhao ◽  
Xiaolin Li
Keyword(s):  
Before And After ◽  
Hot Rolled

Manufacturing of LSAW Pipes Using Hot Rolled Sheets for Sour-Service Application

2021 ◽  
Author(s):  
Rajesh Kumar Goyal ◽  
Mahesh Gajjar ◽  
Ashok Joshi ◽  
Anupkumar Tamhane
Keyword(s):  
Steel Mill ◽  
Corrosion Resistant ◽  
Behavioural Changes ◽  
H2s Corrosion ◽  
Before And After ◽  
Service Application ◽  
Hot Rolled ◽  
Sour Service ◽  
Geographical Locations ◽  
Selection Of

Abstract The exploration and transportation of fluids from corrosive fields or reserves demand corrosion-resistant pipelines. The pipelines for sour-service application demand higher resistance to H2S corrosion because of higher sulphur content observed in the geographical locations. The pipelines laid in the corrosive and marshy lands demand high wall thickness to allow for wall thinning due to corrosion. The linepipes manufactured using TMCP plates are widely accepted for sour-service applications. The use of cut-to-length sheets from hot rolled coils for the manufacturing of LSAW pipes is economical but having limited acceptance by the pipeline operators. Welspun took an initiative to develop the linepipes for an onshore sour-service application using API 5L X60MS grade cut-to-length sheets from TMCP hot rolled coils procured from an approved steel mill. The LSAW pipes of 24” OD × 14.27 mm WT were manufactured by the JCO-E press at Welspun Pipes Mill in Anjar-Gujarat-India. The experience of 24”OD × 14.30 mm WT, API 5L X60MO grade pipes manufacturing using TMCP plates procured from another approved steel mill, was used to decide factors such as alloy design, cleanliness, strength, DWTT, hardness, HIC, SSCC, CVN for the selection of cut-to-length sheets. This paper deals with sheet-to-pipe behavioural changes in properties before and after cold mechanical expansion. Wherever possible, the comparison was also made with plate-pipe behavioural changes in properties.

Calculation on the Residual Stresses of Injection-Molded Conductive-Carbon-Fiber-Filled Polymer Composites

2012 ◽  
Vol 629 ◽  
pp. 55-59
Author(s):  
Ai Yun Jiang ◽  
Jing Chao Zou ◽  
Bao Feng Zhang ◽  
Hai Hong Wu
Keyword(s):  
Carbon Fiber ◽  
Residual Stresses ◽  
Polymer Composites ◽  
Injection Molding Process ◽  
Molding Process ◽  
Filled Polymer ◽  
The Core ◽  
Packing Pressure ◽  
Core Areas ◽  
Injection Molded

For conductive-carbon-fiber-filled polymer composites, the residual stresses developed during injection molding process may affect not only the molding’s conductive property, but its dimensional stability as well. In order to improve the conductivity of the molding fabricated with this kind of composites, we investigated, using layer removal method, the distribution of the residual stresses of injection-molded conductive-carbon-fiber-filled polypropylene in this paper. The residual stresses were obtained under the actions of different processing conditions. Our results indicate that processing pressures have more significant effects on the residual stresses at the skin areas than the core areas of the sample because of fiber orientation. The tensile stresses of the molding at the core areas drop under the action of packing pressure, but the compressive stresses at the skin areas increase. The results reveal that the action of packing pressure may decrease the anisotropy of the residual stresses in the molding.

scholarly journals Changes in Self-Image Resulting from Migration

2019 ◽  
pp. 286-293
Author(s):  
Olga Zotova ◽  
Elena Perelygina ◽  
Sergey Mostikov
Keyword(s):  
Social Interaction ◽  
Host Country ◽  
Dynamic Structure ◽  
Social Situation ◽  
Cultural Environment ◽  
The Core ◽  
Self Image ◽  
The World ◽  
Before And After ◽  
Personality Construct

The perception of one’s own identity is one of the basic moments of a personality construct as they relate to how people act; perceive the world around and with what social they identify themselves. While immersed in an alien culture these perceptions transform. The authors aimed to examine differences in selfimages of the Russian-speaking emigrants before and after emigration. Our hypothesis implies significant differences in self-image upon immersing in another cultural environment. The objective we set resides in identifying aspects of selfimage exposed to transformations and the degree of these changes. For data accumulating before and after the process of international migration with a period of 14 months, we exploited M. Kuhn and T. McPartland’s test “Who am I?” The data demonstrated statistically significant differences in the respondents’ self –image in the course of adaptation. The results allow us to conclude that with a changing social situation self-perception also most alternations exhibit those aspects of selfimage through which the respondents interacted with a host-country population. We believe that self-image presents a hierarchically organized, complex, and dynamic structure with the core and the periphery. The components of self-image can rebuild itself in response to a situation of social interaction.

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