Graphitization Behavior of a Spray Formed Ultra High Carbon Steel during Hot Rolling

2007 ◽  
Vol 539-543 ◽  
pp. 4550-4555
Author(s):  
Hai Sheng Shi ◽  
Guang Min Luo ◽  
Jun Fei Fan ◽  
Yi Jian Lin ◽  
Jing Guo Zhang
Keyword(s):  
Tensile Strength ◽  
Hot Rolling ◽  
Room Temperature ◽  
High Carbon Steel ◽  
Carbon Diffusion ◽  
Carbon Steels ◽  
Key Factors ◽  
High Carbon ◽  
Phase Range ◽  
Effect Of Hot Rolling

The effect of hot rolling parameters on graphitization of a spray formed ultra high carbon steels(UHCSs) was described. The number of graphite stringers and graphite area fractions increased with the increase of rolling reduction. Graphite stringers nucleated at small pores and grew by carbon diffusion from adjacent austenite during hot rolling. Alloy contents, pores and hot deformation atγ+Fe3C phase range are the key factors for graphitization.The graphite stringers of UHCSs have little effect on tensile strength, but reduce the ductility at room temperature.

Microstructure and Mechanical Properties of A Ultra-High Carbon Steel

2006 ◽  
Vol 324-325 ◽  
pp. 907-910 ◽  
Author(s):  
Wei Ping Lin ◽  
Ya Jun Fan ◽  
Zhan Ling Zhang ◽  
Jie Wu Zhu ◽  
Yong Ning Liu
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Tensile Strength ◽  
High Carbon Steel ◽  
Ferrite Matrix ◽  
Carbon Steels ◽  
Eutectoid Transformation ◽  
High Carbon ◽  
Fine Carbide ◽  
Carbide Particles

A ultrahigh carbon steels (UHCS) containing 1.6 wt pct carbon was studied. Through spheroidizing process by divorced-eutectoid transformation (DET), the forged microstructure was spheroidized and the microstructure was fine carbide particles distributed in ferrite matrix. Second-time heat treatment included two kinds of technologies: normalizing and quenching + tempering. Finally, the UHCS obtained ideal mechanical properties. The yield strength and tensile strength of the UHCS were higher than that of 40CrNiMo, moreover plasticity of the UHCS was equal to that of 40CrNiMo. So the UHCS was an excellent structural material.

Deformation and Structure Difference of Steel Droplets during Initial Solidification

2017 ◽  
Vol 36 (4) ◽  
pp. 347-357 ◽  
Author(s):  
Yang Li ◽  
Jing Wang ◽  
Jiaquan Zhang ◽  
Changgui Cheng ◽  
Zhi Zeng
Keyword(s):  
Carbon Steel ◽  
Continuous Casting ◽  
High Carbon Steel ◽  
Low Carbon Steel ◽  
Carbon Steels ◽  
Solidification Structure ◽  
Low Carbon ◽  
High Carbon ◽  
Peritectic Steel ◽  
Initial Solidification

AbstractThe surface quality of slabs is closely related with the initial solidification at very first seconds of molten steel near meniscus in mold during continuous casting. The solidification, structure, and free deformation for given steels have been investigated in droplet experiments by aid of Laser Scanning Confocal Microscope. It is observed that the appearances of solidified shells for high carbon steels and some hyper-peritectic steels with high carbon content show lamellar, while that for other steels show spherical. Convex is formed along the chilling direction for most steels, besides some occasions that concave is formed for high carbon steel at times. The deformation degree decreases gradually in order of hypo-peritectic steel, ultra-low carbon steel, hyper-peritectic steel, low carbon steel, and high carbon steel, which is consistent with the solidification shrinkage in macroscope during continuous casting. Additionally, the microstructure of solidified shell of hypo-peritectic steel is bainite, while that of hyper-peritectic steel is martensite.

Crucible Steel in South India-Preliminary Investigations on Crucibles from Some Newly Identified Sites

1996 ◽  
Vol 462 ◽  
Author(s):  
Sharada Srinivasan
Keyword(s):  
Carbon Steel ◽  
Tamil Nadu ◽  
High Carbon Steel ◽  
Carbon Steels ◽  
Low Carbon ◽  
High Carbon ◽  
Metal Mining ◽  
Hypereutectoid Steel ◽  
Iron And Steel ◽  
Crucible Steel

ABSTRACTEuropean accounts from the 17th century onwards have referred to the repute and manufacture of “wootz’, a traditional crucible steel made especially in parts of southern India in the former provinces of Golconda, Mysore and Salem. Pliny's Natural History mentions the import of iron and steel from the Seres which have been thought to refer to the ancient southern Indian kingdom of the Cheras. As yet the scale of excavations and surface surveys is too limited to link the literary accounts to archaeometallurgical evidence, although pioneering exploratory investigations have been made by scholars, especially on the pre-industrial production sites of Konasamudram and Gatihosahalli discussed in 18th-19th century European accounts. In 1991–2 during preliminary surveys of ancient base metal mining sites, Srinivasan came across unreported dumps with crucible fragments at Mel-Siruvalur in Tamil Nadu, and Tintini and Machnur in Karnataka and she collected surface specimens from these sites as well as from the known site of Gatihosahalli. She was also given crucible fragments by the Tamil University, Tanjavur, from an excavated megalithic site at Kodumanal, dated to ca 2nd c. Bc, mentioned in Tamil Sangam literature (ca 3rd c. BC-3rd c. AD), and very near Karur, the ancient capital of the Sangam Cheras. Analyses of crucible fragments from the surface collection at Mel-Siruvalur showed several iron prills with a uniform pearlitic structure of high-carbon hypereutectoid steel (∼1–1.5% C) suggesting that the end product was uniformly a high-carbon steel of a structure consistent with those of high-carbon steels used successfully to experimentally replicate the watered steel patterns on ‘Damascus’ swords. Investigations indicate that the process was of carburisation of molten low carbon iron (m.p. 1400° C) in crucibles packed with carbonaceous matter. The fabric of crucibles from all the above mentioned sites appears similar. Preliminary investigations on these crucibles are thus reported to establish their relationship to crucible production of carbon steel and to thereby extend the known horizons of this technology further.

scholarly journals ESTIMATION OF DEFORMABILITY OF HIGH-CARBON STEEL UNDER FORGING

2019 ◽  
Vol 61 (12) ◽  
pp. 995-996
Author(s):  
G. A. Orlov ◽  
Е. N. Shestakova
Keyword(s):  
Wear Resistance ◽  
Carbon Steel ◽  
Hot Rolling ◽  
Hot Deformation ◽  
Finite Temperature ◽  
High Carbon Steel ◽  
Alloying Elements ◽  
Temperature Deformation ◽  
High Carbon ◽  
Hypereutectoid Steel

The article presents high-carbon hypereutectoid steel for production of hot rolling forged rolls. The steel contains 1.2 – 1.4 % of carbon, carbide forming alloying elements Cr, Mo, V and Nb improving  wear  resistance  of  the  rolls,  and  Ni  increasing  hardening  capacity.  It  has  been  found  that  steel  of  proposed  composition  provides  ductility  sufficient  for  hot  deformation  (forging)  by  moderate  single  compressions. Temperature range of ingot deformation has been detected: finite  temperature deformation should not be below 900 °C, forging temperature – 1150 °C. According to its properties steel can be recommended  for manufacturing solid-forged rolls and bandages for composite rolls  of hot rolling from ingots of up to 10 tons weight.

scholarly journals Novel Etching Technique for Delineation of Prior-Austenite Grain Boundaries in Low, Medium and High Carbon Steels

Materials ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3296
Author(s):  
Richard Thackray ◽  
Eric J. Palmiere ◽  
Omar Khalid
Keyword(s):  
Grain Boundaries ◽  
Prior Austenite ◽  
Picric Acid ◽  
High Carbon Steel ◽  
Sodium Dodecyl ◽  
Carbon Steels ◽  
Sodium Dodecylbenzene Sulfonate ◽  
High Carbon ◽  
Austenite Grain ◽  
Prior Austenite Grain

The etching of prior austenite grain boundaries in martensite for detailed quantitative metallography of low to high carbon steel has been carried out using aqueous solutions of picric acid containing different wetting agents. The choice of wetting agent was shown to be dependent on the carbon content of the steel, with sodium dodecyl sulfate (SDS) being more suitable for use with low and medium carbon steels, whereas sodium dodecylbenzene sulfonate (SDBS) was shown to be more appropriate for high carbon steels. It is also recommended that, for a particular steel, a variety of temper treatments should be carried out in order to reveal grain boundaries, particularly where more detailed results than simple grain size measurements are required. Finally, the use of dummy specimens prior to etching of the real samples was shown to reduce the need for re-polishing and re-etching of the samples.

Effect of Adhesive Hardening Treatment on Adhesion Tensile Strength of a High Carbon Steel

1989 ◽  
Vol 75 (5) ◽  
pp. 806-811
Author(s):  
Iwao SAWAI ◽  
Yoshio OKUNO ◽  
Ken SUZUKI ◽  
Toshihei MISAWA
Keyword(s):  
Tensile Strength ◽  
Carbon Steel ◽  
High Carbon Steel ◽  
High Carbon ◽  
Hardening Treatment

Prevention of Fracture of Cracked Steel Bars Using Laser: Part III—Case of High Carbon Steel

1988 ◽  
Vol 110 (4) ◽  
pp. 319-324
Author(s):  
Akira Kato
Keyword(s):  
Tensile Strength ◽  
Fatigue Strength ◽  
Carbon Steel ◽  
Laser Welding ◽  
Base Metal ◽  
High Carbon Steel ◽  
High Carbon ◽  
Bending Fatigue ◽  
Static Tensile ◽  
Bending Fatigue Strength

The effect of laser welding on prevention of the fracture of cracked shafts of a high carbon steel are presented. Static tensile strength and rotary bending fatigue strength were obtained using shaft specimens of AISI W1 which were welded by a CO2 laser around a precrack. Since the welded region became extremely hard and brittle, both the strengths of laser-welded specimens were lower than those of non-welded specimens. However, the strengths were increased higher than those of non-welded specimens after tempering the specimens. It was found that when tempered at 600°C after laser welding, the rotary bending fatigue strength of specimens with a crack smaller than 12 mm rose similar to that of the base metal, and when tempered at 700° C, the static tensile strength of specimens with a crack smaller than 12mm rose similar to that of the base metal. Therefore, it was shown that the laser welding is very effective to prevent fracture of high carbon steels.

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