Effect of Heat Treatment Parameters on the Hardness of Soil Working Parts

2011 ◽  
Vol 422 ◽  
pp. 701-704
Author(s):  
Yong Ying Du ◽  
Yu Guo ◽  
Yu Ning Wang ◽  
Ming Ang Yin
Keyword(s):  
Heat Treatment ◽  
Orthogonal Design ◽  
Great Influence ◽  
Spring Steel ◽  
Treatment Technology ◽  
Quenching Temperature ◽  
Tempering Temperature ◽  
Hardness Property ◽  
Treatment Parameter ◽  
Planar Figure

The experiment of the hardness property for 65Mn spring steel under different heat treatments is conducted. The results are discussed based on the regression orthogonal design. The hardness property of 65Mn steel has been discussed by applying diverse heat treatment technology and the optimum parameters of heat treatment for the best hardness value are obtained through experiments. The influence of the parameters on hardness property is studied by applying the regression orthogonal design. The relation between the hardness and diverse heat treatment parameters has been given by using planar figure. The optimum heat treatment parameter for maximum hardness ability is obtained as following: 851.4°C for quenching temperature, 18 min for quenching time, and 146.4°C for tempering temperature, respectively. The result showed that the selection of material heat treatment process parameters has a great influence on the hardness of the material, which will provide a reliable basis to further study the wear resistance of material.

Research on the Effect of Heat Treatment Parameters of Rotary Tiller Blade on Anti-Wear Properties

2011 ◽  
Vol 391-392 ◽  
pp. 620-624
Author(s):  
Yong Ying Du ◽  
Dan Jin
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Orthogonal Design ◽  
Spring Steel ◽  
Wear Property ◽  
Wear Properties ◽  
Treatment Technology ◽  
Tempering Temperature ◽  
Resistance Property ◽  
Treatment Parameter

65Mn spring steel is mainly used for rotary blade which is a vulnerable part of farming machinery. The experiment of the wear-resistance property for 65Mn spring steel under different heat treatments is conducted. The results are discussed based on the regression orthogonal design. The wear-resistance property of 65Mn steel has been discussed by applying diverse heat treatment technology and the optimum parameters of heat treatment for the best anti-wear property are obtained through experiments. The influence of the parameters on anti-wear property is studied by applying the regression orthogonal design. The relation between the wear mass loss and diverse heat treatment parameters has been given by using planar and contour figure. The optimum heat treatment parameter for maximum anti-wear ability is obtained as following: 852.64 for quenching temperature, 18.36min for quenching time, and 145.44 for tempering temperature, respectively.

The Simulation of Temperature Field of 12Cr2Mo1R Ultra Thick Plate for Pressure Vessels during Heat Treatment by 3D-FEM

2014 ◽  
Vol 556-562 ◽  
pp. 472-475
Author(s):  
Yi Zhang ◽  
Guang Xu ◽  
Yue Yu ◽  
Hai Lin Yang ◽  
Ming Xing Zhou
Keyword(s):  
Heat Treatment ◽  
Temperature Field ◽  
Thick Plate ◽  
Pressure Vessels ◽  
Thickness Direction ◽  
Cooling Process ◽  
3D Fem ◽  
Treatment Technology ◽  
Quenching Temperature ◽  
Simulation Results

With ABAQUS software, a finite element model is built to simulate the temperature field of 150mm ultra thick plate for 12Cr2Mo1R pressure vessels during heat treatment. The simulation results show that the plate’s temperature between the surface and the core is difference during cooling process. Temperature difference is gradually increased with cooling process, then the temperature distribution of plate in the thickness direction becomes uniform. When quenching temperature is 910 °C and cooling medium is water, the microstructure at plate’s quarter in the thickness direction is bainite. Simulation results provide theoretical reference for determining heat treatment technology in industrial production of ultra thick plate.

Influence of Quenching Temperature on Microstructure and Properties of 40Cr Steel by Zero Time Holding Quenching

2011 ◽  
Vol 215 ◽  
pp. 25-28 ◽  
Author(s):  
An Ming Li ◽  
Meng Juan Hu
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Lath Martensite ◽  
Metallographic Analysis ◽  
Treatment Technology ◽  
Quenching Temperature ◽  
Heat Treatment Technology ◽  
Austenite Grains ◽  
Zero Time ◽  
40Cr Steel

The effect of quenching temperature on the microstructure and mechanical properties of 40Cr steel by zero time holding quenching were studied. The results showed that the strength and hardness of 40Cr steel increased with the increase of quenching temperature in the range of 860~940°C, the strength and hardness reach the maximum at 920°C and then decrease. The metallographic analysis shows austenite grains of the samples by “Zero Time Holding” Quenching have been refined compared with the traditional heat treatment technology. Fine lath martensite was obtained by the “zero time holding” quenching due to the smaller austenitic crystal grain and the uneven distribution of the carbon concentration in austenitic crystal grain.

The Research and Development of High Strength Spring Steel with Long Service Life

2013 ◽  
Vol 575-576 ◽  
pp. 365-369
Author(s):  
Bo Xiao ◽  
Yu Cheng Lei ◽  
Xiao Dong Wu
Keyword(s):  
Service Life ◽  
High Strength ◽  
Melting Process ◽  
Spring Steel ◽  
Quenching Temperature ◽  
Tempering Temperature ◽  
Metallic Inclusions ◽  
Key Points ◽  
Strength And Plasticity ◽  
And Control

The research centers on the production process of high tensile 60Si2CrVNb spring steel for long service life with reference to the production conditions. Key points of the research lies in: long fatigue life and control techniques of non-metallic inclusions in melting process. Hot treatment process of spring steel also involves with the research, aiming to increase the strength of material by fining grain size by Nb element. The results confirms to the size of non-metallic inclusions can be controlled below 10μm with adoption of technologies of LF slag control and barium microalloy treatment in steelmaking process. The tensile strength can be over 2.0GPa and the elongation can reach up to 10% in the event that the quenching temperature is900°C and the tempering temperature is 410°C resulting obvious increase of strength and plasticity of spring steel.

Research on Heat Treatment Influence Factors on High-Pressure Cylinder Steel 30CrMo-M

2010 ◽  
Vol 97-101 ◽  
pp. 771-776 ◽  
Author(s):  
Zhong Guo Huang ◽  
Hong Lei Dong ◽  
Qing Hua Yuan ◽  
Shun Yao Jin ◽  
Jia Fan ◽  
...  
Keyword(s):  
Heat Treatment ◽  
High Pressure ◽  
Chemical Composition ◽  
Wall Structure ◽  
Carbon Equivalent ◽  
Temper Brittleness ◽  
High Pressure Cylinder ◽  
Treatment Technology ◽  
Tempering Temperature ◽  
Pressure Cylinder

To increase comprehensive properties of cylinder steel, high-pressure cylinder steel 30CrMo-M was developed on the basis of steel 30CrMo. Tests and researches were made on factors which influence heat treatment properties, such as chemical composition, quenching temperature, and tempering temperature. The results indicated that the 30CrMo-M steel has stable chemical composition, its strength rises with increase of carbon equivalent, and thus it has better relativity. When concentration of quenching liquid is 5%, yield ratio of the steel can be guaranteed to be low, thus safety of cylinder is improved. Tempered between 570°C~622°C, the strength of the steel is increased and plasticity rises with increase of temperature. When tempered at 570°C, inner wall structure of cylinder contains tempering martensite, the strength is high but the plasticity is low. When tempered between 610°C~615°C, temper brittleness happens very easily and toughness is on the low side. The best heat treatment technology is: quenched at 930°C with temperature holding for 40 minutes and quenching liquid concentration as 5%, tempered at 580°C with temperature kept for 90 minutes. The microstructure treated by this technology is tempered sorbite with higher strength, plasticity and toughness.

A Study on the Microstructure and Hardness Feature of 6CrW2MoVSi Steel after Heat Treatment

2014 ◽  
Vol 887-888 ◽  
pp. 223-227
Author(s):  
Yu Mei Dai ◽  
Yong Qing Ma ◽  
Yan Bin Wu ◽  
Ya Nan Ji
Keyword(s):  
Heat Treatment ◽  
High Temperature ◽  
Precipitation Hardening ◽  
Middle Section ◽  
Temperature Quenching ◽  
Quenching Temperature ◽  
Tempering Temperature ◽  
Higher Temperature ◽  
Average Size

6CrW2MoVSi steel has a refined and even microstructure after heat treatment, the average size of annealing carbide is 0.6 μm; quenching martensite is mainly lath-shaped martensite and only a small amount of acicular martensite, and the size of quenching acicular at 950 °C is smaller than 2.5 μm. The curve of quenching hardness increasing with quenching temperature rising is divided into three sections. In the middle section of quenching between 910 °C ~ 980 °C, quenching hardness presents slow rising trend. After higher temperature quenching, there are low and high temperature tempering precipitation hardening zones. At 220 °C ~ 240 °C tempering temperature, precipitation hardness is HRC54 ~ 58. At 540 °C ~ 570 °C tempering temperature, precipitation hardness is HRC52 ~ 56.

Effect of Heat Treatment on the Properties and Precipitations of High Strength Steel Plate for Construction Machinery

2014 ◽  
Vol 971-973 ◽  
pp. 240-243
Author(s):  
Tao Zhang ◽  
Hua Xing Hou ◽  
Zhao Tan
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
High Strength Steel ◽  
Steel Plate ◽  
High Strength ◽  
Quenching Temperature ◽  
Tempering Temperature ◽  
Construction Machinery ◽  
Microstructure And Mechanical Properties ◽  
Tempering Resistance

The effect of heat treatment on the microstructure and mechanical properties of High Strength steel plate Q960E for construction machinery was investigated. The result shows the quenching temperature have obvious effects on the mechanical properties, DQ can improve the toughness and the enchance tempering resistance, precipitations become more and bigger with the rise of the tempering temperature.

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.

Effect of heat treatment on the microstructure and properties of 25Cr2MoVA petroleum casing steel

2021 ◽  
Vol 112 (1) ◽  
pp. 78-84
Author(s):  
Pengjun Cao ◽  
Yilong Zhang ◽  
Kejian Li ◽  
Jiling Dong ◽  
Wei Wu
Keyword(s):  
Heat Treatment ◽  
Tensile Strength ◽  
Corrosion Resistance ◽  
Impact Toughness ◽  
Treatment Process ◽  
Heat Treatment Process ◽  
Maximum Hardness ◽  
Quenching Temperature ◽  
Tempering Temperature ◽  
The Impact

Abstract The 25Cr2MoVA steel was subjected to various heat treatments. We found that the hardness increased when the quenching temperature was in the range of 870 – 910 °C, and then it decreased for the temperature of 910 – 990 °C. The maximum hardness was 553 HV after quenching from 910 °C. Following quenching from 910°C, the 25Cr2Mo-VA steel was tempered in the temperature range of 560 to 750 °C. With an increase in the tempering temperature, the hardness and tensile strength of the material decreased, while the impact toughness increased; the corrosion resistance increased initially and then decreased. The best heat treatment process for the 25Cr2MoVA steel involved quenching form 910 °C and tempering at 650°C for 1 h, the hardness was 362 HV, the tensile strength reached 1 310 MPa, the impact energy reached 149 J, and the material exhibited the best corrosion resistance.

Effect of Heat Treatment on the Microstructure and Hardness of a Newly Developed Plastic Injection Mold Steel

2013 ◽  
Vol 302 ◽  
pp. 263-268
Author(s):  
Yan Ping Zeng ◽  
Wen Yang
Keyword(s):  
Heat Treatment ◽  
Intermetallic Phase ◽  
Xrd Analysis ◽  
Injection Mold ◽  
Quenching Temperature ◽  
Tempering Temperature ◽  
Hardness Tester ◽  
Secondary Particles ◽  
Annealed Steel ◽  
Plastic Injection

The microstructure of a new plastic injection mold steel in the annealed condition and effect of quenching-tempering process on the microstructure and hardness of this steel were investigated by means of OM, SEM, XRD and a digital hardness tester. The microstructure of the annealed steel consisted of ferrite and secondary particles which were identified as a FeCr intermetallic phase based on EDS and XRD analysis. Strong segregation exists in the steel. The microstructures of the quenched steels consisted of fine martensite, a small amount of blocky ferrite and secondary particles except quenching at 1150°C, where the microstructures of the quenched steels consisted of coarse martensite and large number of blocky ferrite. The segregation occurring in the annealed steel can be eliminated completely after heat treatment at the temperatures above 1050°C for 30min. The hardness of the quenched steel continuously increases with quenching temperature up to 1100°C and then drop observably. Hence, the suitable quenching temperature of the steel lies between 1050 and 1100°C. After tempering at 200 and 300°C, the hardness of the steel decreased due to the formation of tempered martensite and increased slightly after tempering at 400 and 500°C owing to secondary hardening, whereas this value decreased markedly after tempering at 600°C due to the formation of tempered sorbite. The amount of secondary particles gradually increased with tempering temperature.

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