Characteristics of the G200CrNiMo4-3-3 Cast Steel in as Cast State

2015 ◽  
Vol 641 ◽  
pp. 136-140
Author(s):  
Edyta Rożniata ◽  
Janusz Krawczyk ◽  
Robert Dąbrowski ◽  
Jerzy Pacyna
Keyword(s):  
Heat Treatment ◽  
Impact Test ◽  
Cast Steel ◽  
Initial Material ◽  
Cast State ◽  
Initial State ◽  
The Subject ◽  
The Impact ◽  
Cast Condition ◽  
Fracture Work

The subject of investigations constituted the G200CrNiMo4-3-3 cast steel applied for metallurgical rolls. This is the material, which microstructure can be modified by the heat treatment. The presented hereby work concerns the initial state (as cast condition) of the investigated cast steel. This cast steel constitutes the initial material for the heat treatment. The morphology of carbide precipitates, including the cementite precipitated on grain boundaries of the primary austenite, hypereutectoid cementite precipitated in the Widmannstӓtten system and lederburitic cementite, were characterised in the study. The results of investigations of mechanical and fractographic properties of the G200CrNiMo4-3-3 cast steel, were also presented. Among others, the values of fracture work in the impact test, fracture toughness (KIc) and wear resistance were given. The crack pathway together with the hypereutectoid cementite fraction role in its development, was presented. The obtained investigation results, presented in the hereby paper, will constitute the comparison base for the assessment of the heat treatment influence on the microstructure and properties of the tested G200CrNiMo4-3-3 cast steel.

Structure Analysis of Magnesium Alloy (AZ31) Wires at Different Stages of a Multistage Cold Drawing Process

2016 ◽  
Vol 682 ◽  
pp. 125-131
Author(s):  
Teresa Bajor
Keyword(s):  
Heat Treatment ◽  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Cold Drawing ◽  
Automotive Electronics ◽  
Drawing Process ◽  
Initial State ◽  
Before And After ◽  
The Subject ◽  
The Impact

The formability of magnesium alloys is the subject of efforts undertaken in many research centers due to their outstanding mechanical, plastic, and above all, physical properties. For this reason, magnesium alloys have become an important material which finds broad possibilities for application in many industries: automotive, electronics, aerospace and so on.The paper presents an analysis of changes in structure of AZ31 magnesium alloy wire cold-deformed in the drawing process using interoperate heat treatment. Microstructure observations of the wire by means of optical microscopy were performed in initial state, after each drawing process, and before and after heat treatment. The studies regarding the impact of selected variants of deformation on microstructure were also carried out at the scanning electron microscope (SEM).

Effect of Heat Treatment on Phase Composition and Microstructure of Al-Cu-Fe Alloys with Quasicrystalline Phases

2014 ◽  
Vol 794-796 ◽  
pp. 833-838
Author(s):  
Marina Samoshina ◽  
Pavel Bryantsev
Keyword(s):  
Heat Treatment ◽  
Phase Composition ◽  
Quasicrystalline Phase ◽  
Cast State ◽  
Equilibrium Conditions ◽  
Crystalline Phases ◽  
Different Temperatures ◽  
Fe Alloys ◽  
Cast Condition

The microstructure and phase composition of alloys Al-Cu-Fe in as-cast state and after heat treatment at different temperatures were investigated. The presence of a quasicrystalline phase Al65Cu20Fe15 which coexists with crystalline phases in as-cast condition is found. The formation of single quasicrystalline phase composition in Al - 40 wt.% Cu - 17 wt.% Fe alloy after annealing at 800 °C for 100 hours is established. After heat treatment, i.e. closer to equilibrium conditions, the quasicrystalline phase Al65Cu20Fe15 is transformed into quasicrystalline phase Al13Cu4Fe3 with more complicated lattice.

scholarly journals Corrosion Behaviour of Low-Alloyed Cast Steel in Diverse State

2015 ◽  
Vol 15 (1) ◽  
pp. 25-28
Author(s):  
M. Kondracki ◽  
A. Studnicki ◽  
J. Szajnar
Keyword(s):  
Heat Treatment ◽  
Corrosion Test ◽  
High Salinity ◽  
Corrosion Behaviour ◽  
Cast Steel ◽  
Mining Industry ◽  
Cast State ◽  
Alloyed Cast ◽  
Cast Steels ◽  
Parts Manufacturing

Abstract In the paper the results and analysis of corrosion tests were presented for low-alloyed cast steel in as-cast state and after heat treatment operations. Such alloys are applied for heavy loaded parts manufacturing, especially for mining industry. The corrosion test were performed in conditions of high salinity, similar to those occurring during the coal mining. The results have shown, that small changes in chemical composition and the heat treatment influence significantly the corrosion behaviour of studied low-alloyed cast steels.

Influence of Mn and Heat Treatment Technology on Microstructure and Mechanical Properties of a Low-Alloy Wear-Resistant Cast Steel Shovel Tooth

2012 ◽  
Vol 557-559 ◽  
pp. 34-37
Author(s):  
Jing Qiang Zhang ◽  
Jie Min Du ◽  
Ji Wei Guo ◽  
Shou Fan Rong ◽  
Guang Zhou Wang
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Impact Toughness ◽  
Cast Steel ◽  
Treatment Technology ◽  
Wear Resistant ◽  
Heat Treatment Technology ◽  
Microstructure And Mechanical Properties ◽  
Mn Content ◽  
The Impact

The influences of Mn and heat-treatment technology on microstructure and mechanical properties of medium-carbon-low-alloy wear-resistant cast steel were investigated. The results show that the hardness first increases and then drops down with the increase of Mn content, and the best hardness is 54HRC with Mn content 1.5%. The impact toughness first increases and then drops down with the increase of Mn content. The hardness and impact toughness first increase and then drop down with the increases of quenching temperature. The optimal impact toughness can be obtaind by quenching at 920°C and tempering at 200°C. Part of lower bainite and residual austenite and mass of tempered martensite are obtaind after tempering.

scholarly journals Microstructure Evolution and Mechanical Properties of 0.4C-Si-Mn-Cr Steel during High Temperature Deformation

Materials ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 172 ◽  
Author(s):  
Fei Zhang ◽  
Yang Yang ◽  
Quan Shan ◽  
Zulai Li ◽  
Jinfeng Bi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
High Temperature ◽  
Impact Toughness ◽  
Microstructure Evolution ◽  
Cast Steel ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Grain Sizes ◽  
The Impact

Herein, the effects of height-diameter ratios (H/D) on the microstructure evolution and mechanical properties of 0.4C-Si-Mn-Cr steel during high temperature deformation are reported. The compression experiments were performed on steel samples using Gleeble to obtain a reasonable deformation temperature, and the degree of deformation was assessed in the range of 1.5 to 2.0 H/D via forging. The forged specimens were quenched using the same heat treatment process. The hardness and impact toughness of the steel samples were tested before and after heat treatment. Grain sizes gradually increased with an increase in the compression temperature from 950 °C to 1150 °C, and the grain sizes decreased with an increase in H/D. The microstructure of the steel samples contained pearlite, bainite, martensite, and retained austenite phase. The microstructure after forging was more uniform and finer as compared to that of as-cast steel samples. The hardness and impact toughness of the steel samples were evaluated after forging; hardness first increased and then decreased with an increase in H/D, while the impact toughness continuously increased with an increase in H/D. Hence, the microstructure and properties of steel could be improved via high temperature deformation, and this was primarily related to grain refinement.

Effects of Heat Treatment Process on Microstructure and Mechanical Properties of 31Mn2SiREB Cast Steel

2013 ◽  
Vol 762 ◽  
pp. 418-423
Author(s):  
Feng Zhang Ren ◽  
Feng Jun Li ◽  
Ling Bai ◽  
Yun Fei Wang
Keyword(s):  
Heat Treatment ◽  
Impact Energy ◽  
Treatment Process ◽  
Cast Steel ◽  
Diffusion Annealing ◽  
Heat Treatment Process ◽  
Micro Hardness ◽  
Quenching Temperature ◽  
Pre Treatment ◽  
The Impact

The heat treatment process of 31Mn2SiREB cast steel used in crawler shoes is directly lifted from the heat treatment process of Mn13 high-manganese cast steel, i. e., quenching at 1050 oC after casting. The reasonableness of the process needs to be surveyed. In this paper, the effects of quenching temperature and diffusion annealing pre-treatment on mechanical properties, micro-area composition uniformity and micro-hardness uniformity were investigated. For quenching after casting, the tensile strength and impact energy increase observably with the elevation of quenching temperature, but the impact energy at higher quenching temperature is still very small. The fluctuation of micro-hardness and chemical composition at different micro-areas becomes obviously small with the increase of quenching temperature. For quenching after a diffusion annealing pre-treatment, the impact energy is very high and up to 36.3 J.

Microstructure and Tribological Properties of a Material with Cementite Eutectic Applied for Metallurgical Rolls

2016 ◽  
Vol 682 ◽  
pp. 119-124
Author(s):  
Edyta Rożniata ◽  
Janusz Krawczyk ◽  
Robert Dąbrowski ◽  
Marcin Madej ◽  
Łukasz Frocisz ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Large Fraction ◽  
Cast Steel ◽  
Abrasive Wear Resistance ◽  
Cast State ◽  
Primary Austenite ◽  
Austenite Grain ◽  
Austenite Grains ◽  
Steel Rolls

Three prototype metallurgical rolls were produced on the basis of G200CrNiMo4-3-3 material. The method applied for the microstructure forming was different for each roll: the roll marked WOT – as cast state (without a modification and heat treatment); the metallurgical roll marked WMT – during its casting the FeCaSi deoxidizing was applied and then modification by a complex inoculant and argoning; the metallurgical roll marked WNT – subjected to a heat treatment (incomplete normalizing).The mentioned above differences in the technology of making rolls caused changes in their microstructure.The cementite eutectic and pearlitic matrix occurred in each roll. The main differences in the microstructure of cast steel rolls concerned a morphology of precipitates of hypereutectoid cementite. In the WOT roll cementite was mainly in the Widmannstӓtten system. Precipitates of hypereutectoid cementite in the WMT roll occurred along grain boundaries of primary austenite. A large fraction of spheroidal hypereutectoid cementite, precipitated in the whole volume of the primary austenite grain, appeared in the WNT roll. The microstructure influenced the rolls hardness and was equal 260 ÷ 350 HBW.Tribological investigations indicated decreasing the abrasive wear resistance with increasing the hypereutectoid cementite fraction within the primary austenite grains.

The Microstructure and the Wear Resistance of the Hypoeutectic High Carbon Fe-B Cast Steel

2010 ◽  
Vol 146-147 ◽  
pp. 1009-1012 ◽  
Author(s):  
Ji Wen Li ◽  
Guo Shang Zhang ◽  
Shi Zhong Wei
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Cast Steel ◽  
Metallic Matrix ◽  
Air Cooling ◽  
High Carbon ◽  
Quenching Temperature ◽  
Tempering Temperature ◽  
The Matrix ◽  
The Impact

A new wear resistance material named the hypoeutectic high carbon Fe-B cast steel with fine hard carbides dispersive distributed in the matrix have been investigated. The results show that the solidified structures of high carbon Fe-B steel consist of ferrite, pearlite and boride, and borides were distributed along grain boundary in interconnected network. After heat treatment, the metallic matrix changes into martensite and retained austenite. The eutectic borides are appeared to be less continuous network and isolated particles. The increasing of the quenching temperature leads to the improvement of hardness. Quenching at 980°C, impact toughness is increased with the increasing of the tempering temperature. The optimum heat treatment is quenching at 980°C(oil cooling) and tempering at 330°C(air cooling). The wear resistance of modified high carbon Fe-B cast steel is corresponding to Cr26 alloy. The impact wear mechanism is mainly plastic deformation and fatigue spalling.

Formation of structure and properties of complex alloy cast steel

2020 ◽  
pp. 429-432
Author(s):  
V.S. Muratov ◽  
E.A. Morozova ◽  
N.S. Yakimov
Keyword(s):  
Heat Treatment ◽  
Cast Steel ◽  
Structural Heterogeneity ◽  
Alloying Elements ◽  
Allowable Limit ◽  
Complex Alloy ◽  
Typical Composition ◽  
The Impact ◽  
Alloy Cast ◽  
Experimental Melting

The patters of the effect of change in the chemical composition and modes of heat treatment on the structure and complex of mechanical properties of cast steel VKL-3 (12Kh2NVML) are studied. The experimental melting of steel with increased content of chromium, silicon, nickel and molybdenum is obtained. The steel of this composition has reduced ductility and toughness. At the same time, experimental steel melting makes it possible to the model segregation zones with increased content of alloying elements in the steel of typical composition that has chemical and structural heterogeneity and heterogeneity of ductility and toughness. It is shown that the use of the fi nal heat treatment with the adjusted modes (in particular, increased temperature and time of tempering) allows increasing the ductility of the steel to the required values, but the impact strength does not reach the required levels. The recommendations for maintaining of the alloying elements content near the lower allowable limit are given.

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