scholarly journals Study on Microstructure and Mechanical Property in Mg-Gd-Y Alloy by Secondary Extrusion Process

Crystals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 939
Author(s):  
Jianhua Liu ◽  
Jie Sun ◽  
Qingqiang Chen ◽  
Laixiao Lu ◽  
Yanhua Zhao
Keyword(s):  
Yield Strength ◽  
Basal Slip ◽  
Extrusion Process ◽  
High Yield ◽  
Air Cooling ◽  
Water Cooling ◽  
Cast Ingot ◽  
Texture Intensity ◽  
Fine Grain ◽  
Cooling Method

Extruded Mg-Gd-Y alloy tubes were obtained by using cast ingot and extruded bar billets. Microstructure and mechanical properties were also studied with two different cooling methods: air cooling and water cooling. The result shows that by using an extruded bar as billet extruded tubes achieves higher elongation comparing to using cast ingots due to favored texture for the activation of basal slip. Using the water-cooling method, extruded tubes achieve a higher yield strength compared to the air cooling method due to their fine grain size. Using cast ingot billets and the water-cooling method, the elongation is only 6% due to large unrecrystallized grains caused by inhomogeneous deformation and unfavored texture for the activation of basal slip. Using the extruded bar billet and the water-cooling method, the tube has uniformed small grains and much more randomized texture caused by the inhibition of preferred grain growth process. The highest texture intensity is only 1.852 in this kind of tube. Both high yield strength (195.3 MPa) and high elongation (23.9%) are achieved in this tube.

Solidification Simulation of Large Flat Ingot in Different Intensive Cooling Conditions

2012 ◽  
Vol 430-432 ◽  
pp. 517-520
Author(s):  
Nan Lv ◽  
Sheng Li Li ◽  
Yong Long Jin ◽  
Xin Gang Ai ◽  
Dong Wei Zhang
Keyword(s):  
Shrinkage Cavity ◽  
Air Cooling ◽  
Water Cooling ◽  
Columnar Crystal ◽  
Heavy Plate ◽  
Fine Grain ◽  
Solidification Simulation ◽  
Cooling Conditions ◽  
Forced Air ◽  
Shrinkage Cavities

The production of huge rectangular ingots becomes crying needs in the condition of lots of heavy plate mills more than 5m have been in operation. In this paper, we simulate the solidification of 60t Q235 huge rectangular ingot with ProCAST in different cooling conditions such as air cooling, forced air cooling and water cooling. The results show that solidification time in forced air cooling and water cooling shortened than that in air cooling respectively by 0.9 hours and 2.2 hours; The primary fine-grain area is large in the forced air cooling and water cooling. In forced air cooling , we can obtain the largest equiaxial crystal ratio and the minimum columnar crystal ratio; The shrinkage cavity position of the ingot in forced air cooling and water cooling is closer to riser than it is in air cooling, but the volumes of shrinkage cavities respectively increased to a greater extent than in air cooling.

Microstructure and Mechanical Properties of 22MnB5 Steel with Different Cooling Method

2013 ◽  
Vol 331 ◽  
pp. 555-558 ◽  
Author(s):  
Hong Wei Liu ◽  
Jing Bo Yu ◽  
Hong Yun Zhao
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Volume Fraction ◽  
Air Cooling ◽  
Water Cooling ◽  
Cooling Method ◽  
22Mnb5 Steel ◽  
Microstructure And Mechanical Properties ◽  
Result Show ◽  
Cooling Speed

Microstructure and mechanical properties of 22MnB5 Steel were analysis with different cooling method. The result show that the volume fraction of martensite in 22MnB5 is increased with the rising of cooling speed, the microstructure with air cooling is composed of ferrite and pealite, and the quenched microstructure is 100% martensite with metal die cooling and water cooling, tensile strength increased with the rising of cooling speed. The highest tensile strength is 1569.60MPa with elongation only 2.13% with water cooling method.

scholarly journals Analysis of Material Performance According to the Cooling Method of Fire Damaged Concrete

2020 ◽  
Vol 20 (3) ◽  
pp. 167-174
Author(s):  
Hyun Kang ◽  
Oh Sang Kweon
Keyword(s):  
Air Cooling ◽  
Water Cooling ◽  
Performance Difference ◽  
Rc Structures ◽  
Cooling Method ◽  
Exposure Temperature ◽  
Residual Performance ◽  
The Impact ◽  
Non Destructive ◽  
Cooling Methods

In this study, material performance was analyzed depending on the cooling method of concrete damaged by fire. Various non-destructive and destructive tests were conducted for material performance analysis. Further, the influence of cooling methods was assessed according to each test. As a result of the evaluation, it was confirmed that the residual performance of the concrete was significantly different according to the cooling method (air cooling and water cooling), and the performance difference according to the cooling method was also observed depending on the exposure temperature. Through this study, it was possible to understand the impact of water used in firefighting on fire-damaged RC structures, and it is deemed necessary to further study various concrete mixing models.

Influence of Cooling Method on the Microstructure and Stress Rupture Property of a Single Crystal Superalloy

2015 ◽  
Vol 816 ◽  
pp. 513-517 ◽  
Author(s):  
Zhen Xue Shi ◽  
Shi Zhong Liu ◽  
Xiao Guang Wang ◽  
Jia Rong Li
Keyword(s):  
Single Crystal ◽  
Cooling Rate ◽  
Stress Rupture ◽  
Single Crystal Superalloy ◽  
Air Cooling ◽  
Water Cooling ◽  
Stress Rupture Property ◽  
Cooling Method ◽  
Stress Rupture Properties ◽  
Rupture Properties

The single crystal superalloy with [001] orientation were prepared by screw selecting method in the directionally solidified furnace. Three different cooling method, water cooling (WC), air cooling (AC) and furnace cooling (FC) were used after same solution treatment. Then these specimens received same two-step aging treatment. Influence of solution cooling method on the microstructure and stress rupture properties of the alloy under the test condition of 980 °C and 300 MPa was investigated. The microstructures of the samples were examined by scanning electron microscope (SEM). The results showed that the solution cooling method of heat treatment played an important role in the microstructure and stress rupture properties of the alloy. The size of γ′ phase and the width of the γ matrix channel of the alloy increased with decreasing cooling rate. The stress rupture properties of the alloy increased at first and decreased afterwards with decreasing cooling rate. The alloy with air cooling (AC) has the best stress rupture properties. The γ′ phase changed into a perfect raft structure during the stress rupture process of the specimens with AC method. However, the γ′ phase changed into a very irregular raft microstructure in the specimens with the water cooling (WC) and furnace cooling (FC) method. The micro-cracks in the specimen with irregular raft make the initiation and interconnection easier than that in the specimen with regular raft. Therefore, the alloy with AC method has optimum microstructure and stress rupture property.

scholarly journals Microstructures and mechanical properties of austenitic light-weight steels, and prediction of property distribution in large-scale slab

2020 ◽  
Vol 58 (12) ◽  
pp. 830-842
Author(s):  
Tae-Ha Kim ◽  
Yoon Suk Choi ◽  
Kyeong-Won Kim ◽  
Seong-Jun Park ◽  
Jun Young Park ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Yield Strength ◽  
Cooling Rate ◽  
Large Scale ◽  
Air Cooling ◽  
Light Weight ◽  
Water Cooling ◽  
Absorbed Energy ◽  
Cooling Rates ◽  
Microstructures And Mechanical Properties

The effects of the cooling rate, after solution heat treatment, on the microstructures and mechanical properties of Fe-22Mn-8Al-0.8C-0.02Nb (low carbon) and Fe-20Mn-8Al-1.1C-0.1Nb (high carbon) light-weight steels were systematically investigated. The cooling process was controlled to achieve six different cooling rates, ranging from -0.016 to -465.1 <sup>o</sup>C/s. Under the slowest cooling rate (furnace cooling), intra-granular and inter-granular precipitations of <i>κ</i>-carbides were observed throughout the austenite grains. The higher the C content was, the larger the size of the inter-granular <i>κ</i>-carbides was. The formation of <i>κ</i>-carbides resulted in an increase in yield strength, and a decrease in elongation and impact absorbed energy. In the Fe-20Mn-8Al1.1C-0.1Nb, the inter-granular precipitation of <i>κ</i>-carbides caused a drastic decrease in the impact absorbed energy and the inter-granular brittle fracture. To predict the distribution of yield strength and impact absorbed energy at production scale (a 10-ton scale slab), finite element analysis was conducted for water cooling and air cooling conditions. The average cooling rates at the center of the slab under water cooling and air cooling were predicted to be -0.126 and -0.031 <sup>o</sup>C/s, respectively. Based on predicted cooling rates, the distribution of mechanical properties was determined. The prediction suggested that a large-scale slab of the light-weight steel with low C content would have good toughness at the center of the slab regardless of cooling condition.

DURIMPHY

Alloy Digest ◽  
2007 ◽  
Vol 56 (2) ◽  
Keyword(s):  
Tensile Strength ◽  
Corrosion Resistance ◽  
Yield Strength ◽  
Physical Properties ◽  
Precipitation Hardening ◽  
Heat Treating ◽  
High Yield ◽  
High Yield Strength ◽  
Precision Alloys ◽  
Very High

Abstract Durimphy is a maraging steel with 1724 MPa (250 ksi) tensile strength and a very high yield strength due to precipitation hardening. This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: FE-140. Producer or source: Metalimphy Precision Alloys.

SUPRALSIM 690

Alloy Digest ◽  
2011 ◽  
Vol 60 (11) ◽  
Keyword(s):  
Fracture Toughness ◽  
Yield Strength ◽  
Tensile Properties ◽  
High Yield ◽  
Bend Strength ◽  
High Yield Strength ◽  
Weight Saving

Abstract Supralsim 690 is high yield strength steel for welded and weight-saving structures. This datasheet provides information on composition, tensile properties, and bend strength as well as fracture toughness. It also includes information on forming and joining. Filing Code: SA-637. Producer or source: Industeel USA, LLC.

SUPERELSO 1100

Alloy Digest ◽  
2012 ◽  
Vol 61 (6) ◽  
Keyword(s):  
Fracture Toughness ◽  
Yield Strength ◽  
Tensile Properties ◽  
High Yield ◽  
Steel Alloy ◽  
High Yield Strength ◽  
Weight Saving ◽  
Quenched And Tempered Steel ◽  
Tempered Steel

Abstract SuperElso 1100 is a high yield strength quenched and tempered steel alloy. For welded and weight-saving structures. This datasheet provides information on composition and tensile properties as well as fracture toughness. It also includes information on forming, machining, and joining. Filing Code: SA-654. Producer or source: Industeel USA, LLC.

REPUBLIC 50

Alloy Digest ◽  
1967 ◽  
Vol 16 (1) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
Yield Strength ◽  
Physical Properties ◽  
Structural Steel ◽  
High Strength ◽  
Heat Treating ◽  
High Yield ◽  
Bend Strength ◽  
High Yield Strength

Abstract Republic 50 is a high-strength low-alloy structural steel recommended where high yield strength and toughness combined with good weldability and corrosion resistance are required. This datasheet provides information on composition, physical properties, elasticity, tensile properties, and compressive, shear, and bend strength as well as fracture toughness and fatigue. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SA-205. Producer or source: Republic Steel Corporation.

HISTAR 355

Alloy Digest ◽  
2015 ◽  
Vol 64 (9) ◽  
Keyword(s):  
Fracture Toughness ◽  
Shear Strength ◽  
Yield Strength ◽  
Physical Properties ◽  
Structural Steel ◽  
Tensile Properties ◽  
Low Temperatures ◽  
High Yield ◽  
High Yield Strength

Abstract Histar 355 is a structural steel combining high yield strength (355 MPa minimum) with excellent toughness at low temperatures and outstanding weldability. This datasheet provides information on composition, physical properties, elasticity, tensile properties, and shear strength as well as fracture toughness. It also includes information on forming, machining, and joining. Filing Code: SA-731. Producer or source: ArcelorMittal and ArcelorMittal Luxembourg.

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