scholarly journals Effect of Quenching and Tempering Treatment on the Microstructure and Properties of Q345B Casting

2015 ◽  
Author(s):  
Biao Wang ◽  
Shifu Chen ◽  
Wenkai Chen
Keyword(s):  
Microstructure And Properties ◽  
Tempering Treatment ◽  
Quenching And Tempering

Study on the Microstructure and Properties of Prehardened Plastic-Mould SWFT Steel for Big Section

2007 ◽  
Vol 353-358 ◽  
pp. 1629-1632 ◽  
Author(s):  
Yi Luo ◽  
Xiao Chun Wu ◽  
Hong Bin Wang ◽  
Yong An Min
Keyword(s):  
Carbon Content ◽  
Comparative Experiment ◽  
Large Section ◽  
Microstructure And Properties ◽  
The Stability ◽  
Quenching And Tempering ◽  
Plastic Mould

In order to develop the prehardened plastic-mould SWFT steel for big section without quenching and tempering, the influence of carbon on the microstructure and corresponding hardness of steel under both air and sand cooling were investigated. It was demonstrated that when the carbon content of steels increased, the stability of overcooling austenite increased and the hardness difference decreased because of the decrease of bulk ferrite and the increase of bainite. The microstructure of No.8 steel under both air and sand cooling was mostly bainite and the hardness difference was less than 3HRC.And the No.8 steel had good machineability by the turning comparative experiment of No.8 steel and 45# steel. The prehardened plastic mould SWFT steel for big large section was produced successfully based on the experiment result.

scholarly journals The Effect of Heat Treatments on the Fatigue Strength of H13 Hot Work Tool Steel

2018 ◽  
Author(s):  
Ruhi Yeşildal
Keyword(s):  
Fatigue Strength ◽  
Heat Treatments ◽  
Fatigue Tests ◽  
Bending Test ◽  
Test Machine ◽  
Hot Work Steel ◽  
Tempering Treatment ◽  
Rotating Bending ◽  
And Behavior ◽  
Quenching And Tempering

The fatigue strength of the hot work steel depends on various factors, including the mechanical, properties and behavior and bulk and the surface under layer, the microstructural features as well as heat treatments. The influence of a series of heat treatments on the fatigue strength of H13 hot work steel was investigated. Different preheating, quenching and tempering treatments were applied to four sets of specimens and fatigue tests were conducted at room temperature using a rotating bending test machine. All heat treatments resulted in a certain improvement of the fatigue strength. Highest fatigue strength obtained by applying a double tempering heat treatment (first tempering at 550 °C for two hours and second tempering at 610 °C for two hours) after initial preheating and quenching. One tempering treatment (550 °C for two hours after preheating and quenching) did not significantly improve the fatigue strength.

scholarly journals Surface Laser Quenching as an Alternative Method for Conventional Quenching and Tempering Treatment of 1538 MV Steel

2020 ◽  
Vol 2020 ◽  
pp. 1-9 ◽  
Author(s):  
R. Carrera-Espinoza ◽  
A. Rojo Valerio ◽  
J. del Prado Villasana ◽  
J. A. Yescas Hernández ◽  
P. Moreno-Garibaldi ◽  
...  
Keyword(s):  
Laser Treatment ◽  
Sliding Wear ◽  
Metallic Materials ◽  
Laser Quenching ◽  
Tempering Treatment ◽  
Surface Laser ◽  
Pin On Disk ◽  
Disk Method ◽  
Quenching And Tempering ◽  
Wear Tests

This paper aims at encouraging the use of laser treatment as an environmentally friendly technique to improve the mechanical properties of metallic materials over conventional quenching and tempering techniques through the study of the tribological behavior of AISI 1538 MV steel subjected to surface laser quenching treatment. Sliding wear tests were carried out by the pin-on-disk method. In order to identify the wear mechanisms, the worn surfaces on the disks were evaluated by scanning electron microscopy and the wear scars on the ball were observed by optical microscopy. Results reveal that laser treatment reduces the average friction coefficient by 25% and the wear rate by 60% compared with those achieved by the conventional methods, while the depths of the wear track and hardness of the cross section and surface are maintained.

Microstructure and Properties of 1.0C-1.5Cr Bearing Steel in Processes of Hot Rolling, Spheroidization, Quenching, and Tempering

2019 ◽  
Vol 90 (3) ◽  
pp. 1800470 ◽  
Author(s):  
Chang-Sheng Li ◽  
Zhen-Xing Li ◽  
Jin-Yi Ren ◽  
Xing-Yang Tu ◽  
Bin-Zhou Li
Keyword(s):  
Hot Rolling ◽  
Bearing Steel ◽  
Microstructure And Properties ◽  
Quenching And Tempering

Fracture Analysis of the Double-Circular-Arc Gear Reducer Shaft

2013 ◽  
Vol 395-396 ◽  
pp. 797-801
Author(s):  
Xiang Han
Keyword(s):  
Surface Hardness ◽  
Central Zone ◽  
Fracture Morphology ◽  
Crack Edge ◽  
Source Zone ◽  
Metallographic Examination ◽  
Tempering Treatment ◽  
Level 1 ◽  
Quenching And Tempering ◽  
Shaft Surface

A fractured shaft was made of 45 steel. The properties and reasons of the shaft were found by micro and macro observation on fracture surfaces, metallographic examination and hardness testing. The results showed that the fracture mode of the shaft were one-off overload fracture of the central zone and fatigue fracture of the brim. The fatigue source zone was in the subsurface. The fracture was caused by the original defects existed in the shaft central zone. It propagated an about 140 mm crack in operation. The crack source propagated laterally along the big crack edge, which resulted in fracture morphology and fracture forms became complicated. The shaft heart material was made of ferrite-pearlite, inclining widmanstatten structure. According to the YB31-64 standard, it rated column C level 1.Due to uneven grains, mixed crystal phenomenon existed. In addition, because the shaft surface heat treatment process control improperly, the surface hardness was not high to reach the structure standard by quenching and tempering treatment.

Interface Bonding Properties of 25Cr5MoA/Q235 Bimetallic Compound Shaft

2011 ◽  
Vol 284-286 ◽  
pp. 305-309
Author(s):  
Shu Xia Li ◽  
Xue Ping Ren ◽  
Xiao Dan Gao ◽  
Hai Tao Qu
Keyword(s):  
Crack Propagation ◽  
Continuous Distribution ◽  
Gradient Structure ◽  
Fracture Toughness Test ◽  
Interface Microstructure ◽  
Micro Hardness ◽  
Q235 Steel ◽  
Tempering Treatment ◽  
Solid Liquid ◽  
Quenching And Tempering

Taking into account of the key technologies of manufacturing of metal gradient structure shaft with high strength and toughness, interface microstructure, element diffusion, interface micro hardness and resistance to crack propagation ability of the pre-compounding shaft of 25Cr5MoA/Q235 steel manufactured by the method solid-liquid were studied in this paper. The results show that using extrusion forming methods, dense microstructure formed near the interface, and after the quenching and tempering treatment, the interface microstructure appears continuous distribution. Interface shear test results indicate that the shear strength is 412.69MPa. Cr element in the combination of the interface appears a continuous distribution; after quenching and tempering it shows a more uniform distribution, and micro hardness changed about 240HV across a region ranging from the bonding interface to both sides by the distance of 50μm. While the micro hardness of 25Cr5MoA/Q235 steel by the method solid-liquid changed about 160HV after the quenching and tempering treatment. The fracture toughness test of gradient structure shaft by solid-liquid compounding shows that because of the termination of crack propagation at the interface between the outer and inner layer, the safety of the graded structured axis in service would be improved.

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