Research on the Effects of the Refining Treatment to the Properties of Dual-Phase Wear-Resistant Steel

2012 ◽  
Vol 602-604 ◽  
pp. 395-400
Author(s):  
Xing Gang Liu ◽  
Yue Wen Yu ◽  
Xu Pan ◽  
Shuai Zhang ◽  
Guo Zhi Zhang
Keyword(s):  
Induction Furnace ◽  
Heating Temperature ◽  
Vacuum Induction Furnace ◽  
Dual Phase ◽  
Resistant Steel ◽  
Wear Resistant ◽  
Metallic Inclusions ◽  
Refining Agent ◽  
Existing Form ◽  
The Impact

Using refining agent to proceed refining treatment on dual-phase wear-resistant steel, the refining agent is made up of CaO, CaF2, Al2O3, Al, Na2CO3 and BaCO3. The experimental furnace is 25kg vacuum induction furnace, stalling 10 minutes after adding the refining agent, the heating temperature is between 1550 and 1600°C. By doing this, the content of harmful impurities including O, N and S in the steel is significantly reduced and the mainly existing form of the main non-metallic inclusions is changed, it also reduces the size and number of the microstructure of the inclusions in the steel and improves the impact toughness and elongation of dual-phase wear-resistant steel significantly.

scholarly journals Effect of Tempering Temperature on Microstructures and Wear Behavior of a 500 HB Grade Wear-Resistant Steel

Metals ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 45 ◽  
Author(s):  
Erding Wen ◽  
Renbo Song ◽  
Wenming Xiong
Keyword(s):  
Electron Microscopy ◽  
Wear Resistance ◽  
Impact Toughness ◽  
Wear Behavior ◽  
Temper Embrittlement ◽  
Surface Hardness ◽  
Resistant Steel ◽  
Tempering Temperature ◽  
Wear Resistant ◽  
The Impact

The microstructure and wear behavior of a 500 Brinell hardness (HB) grade wear-resistant steel tempered at different temperatures were investigated in this study. The tempering microstructures and wear surface morphologies were studied by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The relationship between mechanical properties and wear resistance was analyzed. The microstructure of the steel mainly consisted of tempered martensite and ferrite. Tempered troosite was obtained when the tempering temperature was over 280 °C. The hardness decreased constantly with the increase of tempering temperature. The same hardness was obtained when tempered at 260 °C and 300 °C, due to the interaction of Fe3C carbides and dislocations. The impact toughness increased first and reached a peak value when tempered at 260 °C. As the tempering temperature was over 260 °C, carbide precipitation would occur along the grain boundaries, which led to temper embrittlement. The best wear resistance was obtained when tempered at 200 °C. At the initiation of the wear test, surface hardness was considered to be the dominant influencing factor on wear resistance. The effect of surface hardness improvement on wear resistance was far greater than the impact toughness. With the wear time extending, the crushed quartz sand particles and the cut-down burs would be new abrasive particles which would cause further wear. Otherwise, the increasing contact temperature would soften the matrix and the adhesive wear turned out to be the dominant wear mechanism, which would result in severe wear.

Various Properties of Dual-Phase Intermetallic Compound in Ni-Al System

2010 ◽  
Vol 638-642 ◽  
pp. 1348-1352
Author(s):  
Yoshitaka Iwabuchi ◽  
Isao Kobayashi
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Intermetallic Compound ◽  
Induction Furnace ◽  
Vacuum Induction Furnace ◽  
High Temperature Strength ◽  
Dual Phase ◽  
Ni Content ◽  
Phase Intermetallic ◽  
Oxidation Resistant

NiAl possesses the superior oxidation resistant and Ni3Al shows the good high temperature strength. Various castings with NiAl and Ni3Al were used in order to investigate the influence of Ni content on the properties. The heats were made by using vacuum induction furnace and its properties were evaluated. This article described the density, hardness, oxidation resistance, corrosion resistance and compression strength of the castings in comparison of other structural materials.

Study on Property and Microstructure in HAZ of High-Strength Abrasion-Resistant Steel

2006 ◽  
Vol 306-308 ◽  
pp. 947-952
Author(s):  
Ji Tai Niu ◽  
Wei Feng Huang ◽  
Jing Jun Xu ◽  
Yong Liang Guo
Keyword(s):  
Impact Toughness ◽  
Arc Welding ◽  
Physical Simulation ◽  
Heating Temperature ◽  
High Strength ◽  
Welding Parameters ◽  
Gas Shielded Arc Welding ◽  
Resistant Steel ◽  
Carbon Dioxide Gas ◽  
The Impact

In this paper, a type of the high-strength abrasion-resistant steel-NM360 has been studied with the aid of the modern physical simulation technology to solve the problem of its poor weldability. In the experiment, the welding thermal cycles under different cooling conditions with the peak heating temperature of 1320oC were simulated via the Gleeble-1500D thermal/mechanical simulator. The SH-CCT diagram of NM360 has been established by investigating the microstructure transformation course and the hardness of the welded heat-affected zone (HAZ) near fusion line during different cooling process. Moreover, the impact toughness and fracture in HAZ with different cooling rate have been studied. The established SH-CCT diagram and impact toughness in HAZ provide the referential experimental basis for selecting proper welding parameters. At last, the welding parameters for NM360 steel are determined with the aid of nomography of carbon dioxide gas shielded arc welding and empirical formula.

Study on the Microstructure and Performance of New Type Martensite Wear Resistant Steel

2011 ◽  
Vol 199-200 ◽  
pp. 167-172
Author(s):  
Jia Wang ◽  
Qing Zhong He ◽  
Yong Hu ◽  
Ming Chao Wang
Keyword(s):  
Wear Resistance ◽  
Abrasive Wear ◽  
Impact Energy ◽  
Wear Mechanism ◽  
Abrasive Wear Resistance ◽  
Manganese Steel ◽  
Resistant Steel ◽  
Wear Resistant ◽  
And Performance ◽  
The Impact

The new low alloy martensitic wear resistant steel 25Si2MnNi3 and steel 53Si2MnNi3 are developed, which hardness are about HB450 and HB600 respectively, the impact abrasive wear resistance of new low alloy steel relative to high manganese steel ZGMn13 is investigated on MLD-10 type impact abrasive wear tester under the different impact energy, and the wear mechanism is analyzed. As a result, the new low alloy martensitic steel which impact toughness is well always obtains better impact abrasive wear resistance than that of steel ZGMn13 under different impact energy, and the primary wear mechanism gradually changes from micro-ploughing and micro-cutting to micro-fatigue and micro-cracking with impact energy increasing.

Study on Organization and Properties of the New Wear-Resistant Steel

2011 ◽  
Vol 704-705 ◽  
pp. 1423-1428 ◽  
Author(s):  
Ning Bo Li ◽  
Jing Pei Xie ◽  
Wen Yan Wang
Keyword(s):  
High Speed ◽  
Lath Martensite ◽  
Testing Machine ◽  
Residual Austenite ◽  
Wear Testing ◽  
Treatment Technique ◽  
Resistant Steel ◽  
Tensile Testing Machine ◽  
Wear Resistant ◽  
The Impact

By means of wear analysis of the wear-resistant steel used in the process, and adjust the wear-resistant steel composition, by adding alloying elements Cr, Mo and so on, optinlizing heat treatment technique, to get new wear-resistant steel. The HR-150A rock well hardness tester and JB-300B impact tester as well as SHIMADZUAG-I250KV on electronic tensile testing machine were used to test the mechanical properties of materials. In the test of friction and wear performance was done using the high temperature and high-speed friction of wear-testing maching (MMS-1G), and analysis of microscopy and the wear morphology by JSM-5610LV SEM．The results showed that: The hardness of new wear-resistant steel reaches HRC53, the impact toughness 23J/cm2, And at this moment, the sample matrix is the microstructure of small lath martensite and residual austenite.

scholarly journals Coarse Grained Heat-Affected Zone Microstructure and Brittleness of Ti-Nb-B Microalloyed High Toughness and Wear Resistant Steel

Metals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 289
Author(s):  
Defa Li ◽  
Kaiming Wu ◽  
Hangyu Dong ◽  
Oleg Isayev ◽  
Oleksandr Hress
Keyword(s):  
Impact Toughness ◽  
Heat Affected Zone ◽  
High Hardness ◽  
Controlled Rolling ◽  
Coarse Grained ◽  
Coarse Grain ◽  
Theoretical Formula ◽  
Resistant Steel ◽  
Wear Resistant ◽  
The Impact

The effects of B, Ti-Nb, and Ti-Nb-B microalloying on the microstructure and properties of the coarse grain heat affected zone (CGHAZ) of C-Mn-Si-Mo wear-resistant steel have been investigated by means of thermal simulation, mechanical property test, microstructure analysis, and theoretical formula calculation. The B, Ti-Nb, and Ti-Nb-B microalloyed C-Mn-Si-Mo wear-resistant steels prepared by a controlled rolling + direct quenching + low temperature (CR + DQ + T) process have martensite/bainite (M/B) dual-phase microstructure and fully-refined effective grain size, which make the base metal to have high hardness and impact toughness. At the heat input of 20 kJ/cm, the impact toughness of CGHAZ of three kinds of microalloyed wear-resistant steels decreased in varying degrees. The main reasons for brittleness were coarse grain embrittlement and microstructural embrittlement. Ti-Nb-B microalloying can effectively prevent grain growth in CGHAZ while avoiding the formation of pearlite, small lump ferrite, and large grain carbides at the grain boundaries, thereby reducing the embrittlement of coarse grain and microstructure.

Effect of Alloy Addition on Mechanical Properties and Decarburization Sensitivity of Spring Steel

2012 ◽  
Vol 476-478 ◽  
pp. 188-193
Author(s):  
Jun Tian ◽  
Shun Xue ◽  
Guo Guang Cheng ◽  
Kuo Chih Chou
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Impact Energy ◽  
Induction Furnace ◽  
High Strength ◽  
Spring Steel ◽  
Vacuum Induction Furnace ◽  
High Toughness ◽  
Alloy Addition ◽  
The Impact

The mechanical properties and decarburization layer depths after heat treatment have been investigated for the experimental steels，which were melted by means of 10Kg vacuum induction furnace in the laboratory . It has been confirmed that additions of silicon and vanadium can improve strength of the steels and, the tensile strength of the steels increases with silicon content from 1.4% up to 2.0%. The reduction of carbon content and the addition of carbide forming elements decrease the decarburization sensitivity of the steels tested. The tensile strengths of the steels with carbon less than 0.5% are between 1016.88 to 1674.64 MPa, and the impact energy between 15.50 to 34.50 J, which are compared with the tensile strength of 1160.89MPa, the impact energy of 19.00 J for 55SiCrV. The steels with optimized compositions, which consists of 0.4~0.5% C, 1.6~2.0% Si, 0.8% Cr, 0.2% V, have a satisfactory property with high strength, high toughness and good anti-decarburization.

Analyzing on the Reasonable Composition of High-Chromium Alloy Cast Iron to Make the Mud Pump Shell of Dredger

2013 ◽  
Vol 734-737 ◽  
pp. 2465-2469
Author(s):  
Jun Yan ◽  
Hong Lu Bai ◽  
Jiao Liu ◽  
Da Jun Song
Keyword(s):  
Heat Treatment ◽  
Cast Iron ◽  
Heating Temperature ◽  
Treatment Method ◽  
Chromium Alloy ◽  
Wear Resistant ◽  
High Chromium ◽  
High Chromium Cast Iron ◽  
The Impact ◽  
Chromium Cast Iron

Chose high-chromium cast iron as the material to make the mud pump shell, the composition of high-chromium alloy has been optimized and five kinds of alloy ( A, B, C, D and E) are designed. Furthermore, using the heat treatment method of air-cooled quenching of 1040°C + 260°C tempering, the relationship among material hardness, the impact toughness and the heating temperature is analyzed after heat treatment. Finally, the abrasion performance of wear-resistant materials is tested. The test result shows that all kinds of wear-resistant materials display well anti-abrasion performance, where the material E has the best relative wear resistance and 19.3% higher than the imported pump casing material. The results provide a scientific standard for selecting the practical wear-resistant materials and locating the piece casting bivalve pump of Cr26 high-chromium cast iron.

Research on the Impact of Temperature on the Softening Point of SBS Modified Asphalt

2013 ◽  
Vol 365-366 ◽  
pp. 978-982
Author(s):  
Xiao Wei Feng ◽  
De Wen Zhang
Keyword(s):  
Softening Point ◽  
Heating Temperature ◽  
Road Construction ◽  
Curing Temperature ◽  
Important Indicator ◽  
Modified Asphalt ◽  
Influence Of Temperature On ◽  
Sbs Modified Asphalt ◽  
The Impact ◽  
Initial Heating

The softening point of modified asphalt is an extremely important indicator to evaluate the high-temperature performance; its the temperature of modified asphalt sample emerging shear deformation under the action of certain shear stress according to the specific heating rate. Its found that in the actual construction and testing, different temperature conditions has a larger impact on the softening point of the modified asphalt, which has adverse affect on road construction. This paper studied and researched the influence of temperature on modified asphalt softening point indicators from the different test temperature, including packing compact temperature, scraper temperature in removal of asphalt that above test mode, standing temperature, curing temperature and initial heating temperature before test.

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