Effect of Hot Compression on Mechanical Properties of Gray Iron

2011 ◽  
Vol 225-226 ◽  
pp. 1080-1083
Author(s):  
Xin Zhao ◽  
Xiao Ling Yang
Keyword(s):  
Mechanical Properties ◽  
Sandwich Structure ◽  
Ferrite Matrix ◽  
Total Elongation ◽  
Gray Iron ◽  
Hot Compression ◽  
Tensile Fracture ◽  
Tensile Fracture Surface ◽  
Gleeble 3500 ◽  
Strength And Ductility

Gray iron was hot-compressed on a Gleeble 3500 machine. The effect of hot compression on mechanical properties of gray iron was studied. The result shows that gray iron with the sandwich structure of graphite and ferrite matrix is prepared after more than 45% reduction of hot compression. The mechanical properties of 80% hot-compressed gray iron are significantly enhanced: tensile strength from 117MPa to 249MPa, and total elongation from 0 to 5.2%. The tensile fracture surface presents ductility characters after more than 45% reduction of hot deformation. The increase of the strength and ductility of the hot-compressed gray iron is caused by delamination toughening.

Effect of Strain on Microstructures and Mechanical Properties of Warmly Deformed SCRAM Steel for Fusion Application

2014 ◽  
Vol 941-944 ◽  
pp. 1463-1468
Author(s):  
Yang Mou ◽  
Li Hong Xue ◽  
Qi Lai Zhou ◽  
Cai Xuan Lu ◽  
You Wei Yan
Keyword(s):  
Mechanical Properties ◽  
Dislocation Density ◽  
Volume Fraction ◽  
Tensile Fracture ◽  
Tensile Fracture Surface ◽  
Lath Width ◽  
Microstructures And Mechanical Properties ◽  
Gleeble 3500 ◽  
Reduction Of Area ◽  
Martensitic Lath

The SCRAM steel was processed by warm deformation on Gleeble-3500 thermo-simulation machine. The effect of strain on the microstructures and mechanical properties of SCRAM steel was investigated. The results show that an increase in the strain can result in refining the martensitic laths, increasing the volume fraction of precipitates and the dislocation density in SCRAM steel. The martensitic lath width decreases from 0.83 μm to 0.48 μm and the dislocation density increases from 1.3 × 1015 m-2 to 6.4 × 1015 m-2 in SCRAM steel. The specimen exhibits high ultimate tensile strength and yield strength but low reduction of area and total elongations when the strain (ε) is up to 0.5. The tensile fracture surface observation indicates that dimples become smaller and shallower while tear ridges drastically grow up with the strain increasing.

scholarly journals Case Study of the Tensile Fracture Investigation of Additive Manufactured Austenitic Stainless Steels Treated at Cryogenic Conditions

Materials ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3328
Author(s):  
Róbert Bidulský ◽  
Jana Bidulská ◽  
Federico Simone Gobber ◽  
Tibor Kvačkaj ◽  
Patrik Petroušek ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Austenitic Stainless Steels ◽  
Total Elongation ◽  
Tensile Fracture ◽  
Powder Bed ◽  
Stress Relieving ◽  
316L Austenitic Stainless Steel ◽  
Traditional Manufacturing ◽  
Cryogenic Conditions

Additive manufacturing is a key enabling technology in the manufacture of highly complex shapes, having very few geometric limitations compared to traditional manufacturing processes. The present paper aims at investigating mechanical properties at cryogenic temperatures for a 316L austenitic stainless steel, due to the wide possible cryogenic applications such as liquid gas confinement or superconductors. The starting powders have been processed by laser powder bed fusion (LPBF) and tested in the as-built conditions and after stress relieving treatments. Mechanical properties at 298, 77 and 4.2 K from tensile testing are presented together with fracture surfaces investigated by field emission scanning electron microscopy. The results show that high tensile strength at cryogenic temperature is characteristic for all samples, with ultimate tensile strength as high as 1246 MPa at 4.2 K and 55% maximum total elongation at 77 K. This study can constitute a solid basis for investigating 316L components by LPBF for specific applications in cryogenic conditions.

Evaluation of Mechanical Properties and Microstructures of Casing-Drilling Steels

2010 ◽  
Vol 146-147 ◽  
pp. 674-677
Author(s):  
Tian Han Xu ◽  
Yao Rong Feng ◽  
Sheng Yin Song ◽  
Zhi Hao Jin
Keyword(s):  
Mechanical Properties ◽  
Fracture Surface ◽  
Impact Energy ◽  
Cleavage Fracture ◽  
Fracture Mechanism ◽  
Tensile Fracture ◽  
Tensile Fracture Surface ◽  
Dimple Fracture ◽  
Drilling Technology ◽  
Casing Drilling

An investigation into the mechanical properties of K55，N80 and P110 steels was carried out for casing-drilling technology. The obvious presence of bright facets on broken K55 Charpy V-Notch (CVN) sample surfaces was indicative of the effect of microstructure on the cleavage fracture. The appearing of bright facet surfaces of K55 was attributed to the microstructure of ferrite and pearlite. The fracture surfaces of N80 and P110 CVN samples included quasi-cleavage fracture mechanism and dimple fracture mechanism, respectively. The tensile fracture surface of all three types of casing-drilling steels included dimple fracture mechanism, both the N80 and P110 specimen show higher UTS and impact energy values compared to the K55 specimen.

Properties Evaluation of Micro-Crystalline Cellulose and Starch as Bio-Filler in Rubber Compounding

2016 ◽  
Vol 1133 ◽  
pp. 593-597 ◽  
Author(s):  
Mohd Khairulniza Mansor ◽  
Ruslimie Che Ali
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Filler Loading ◽  
Tensile Fracture ◽  
Crystalline Cellulose ◽  
Tensile Fracture Surface ◽  
Homogenous Distribution ◽  
Cure Time ◽  
Internal Mixer ◽  
Scanning Electron

Effects of filler loading on the mechanical properties of Epoxidised natural rubber (ENR) filled with bio-fillers were studied. The compounds with different filler loadings (0, 30, 50, 70 phr) were prepared in a Haake internal mixer. Result showed that the viscosity of the compounds increased with filler loading and exhibited longer cure time with higher loading of the bio-filler. The mechanical properties of starch-filled vulcanisates present better tensile strength at 50 phr when compared to micro-crystalline cellulose (MCC) filled vulcanisates at similar filler loadings. The scanning electron microscopy (SEM) of tensile fracture surface of 50 phr starch-filled vulcanisates illustrated a homogenous distribution in comparison with MCC-filled compounds.

scholarly journals INFLUENCE OF ALBASIA WOOD ON MECHANICAL PROPERTIES AND MORPHOLOGY OF EPOXY COMPOSITES

2018 ◽  
Vol 10 (2) ◽  
pp. 116
Author(s):  
Henny Pratiwi
Keyword(s):  
Mechanical Properties ◽  
Tensile Properties ◽  
Epoxy Composites ◽  
Tensile Fracture ◽  
Tensile Fracture Surface ◽  
Alternative Reinforcement ◽  
Filler Size ◽  
Pull Out ◽  
The Impact ◽  
Properties Of Composites

This research aims to investigate the effects of albasia wood filler as alternative reinforcement for extravagant and non-renewable filler being used in epoxy composites. The filler size used was 30 mesh and various filler volume fractions were 10, 20, 30 and 40 percent. Composites were manufactured using hand lay-up method. Properties such as tensile strength, elongation, modulus elasticity and strain energy absorption were determined based on ASTM standard. The results show that filler volume content significantly affects the tensile properties and impact strength of albasia wood-epoxy composites. The optimum tensile properties are achieved when 10 percent filler is added into epoxy matrix. The impact test also shows the same results. Further addition of filler decreases the mechanical properties of composites due to the existence of weak interfacial interaction between the albasia wood filler and polymer matrix for higher filler volume concentration beyond 10 vol. %. The scanning electron micrograph reveals that there are voids and pull-out mechanism on tensile fracture surface which are the cause of the composites failure.

Fracture Behaviors of the Rolled Isotactic Polypropylene

2014 ◽  
Vol 529 ◽  
pp. 237-241
Author(s):  
Juan Jia ◽  
Shuang Xin Liu ◽  
Dierk Rabbe
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Isotactic Polypropylene ◽  
Rolling Direction ◽  
Tensile Tests ◽  
Total Elongation ◽  
Tensile Fracture ◽  
Tensile Sample ◽  
Fracture Surfaces ◽  
Fracture Behaviors

The mechanical properties of the rolled isotactic polypropylene and the morphology of fracture surfaces were measured and observed by tensile tests and the scanning electron microscopy. And then the tensile fracture behaviors along the rolling and transvers directions of the rolled samples were analyzed. After rolling, strong anisotropy mechanical properties occurred along the rolling and transverse directions: high tensile strength with low total elongation along the rolling direction and low tensile strength with high total elongation along the transverse direction. After tensile test, three characteristic structures were found on the fracture surfaces. The tensile fracture behavior of the rolled samples is: stress concentration happens on the edge of tensile sample and then fracture develops to the center part of the tensile sample. When the fracture is big enough, the tensile sample will be failed very quickly.

scholarly journals Effects of Cr and Mo on Mechanical Properties of Hot-Forged Medium Carbon TRIP-Aided Bainitic Ferrite Steels

Metals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1066 ◽  
Author(s):  
Koh-ichi Sugimoto ◽  
Sho-hei Sato ◽  
Junya Kobayashi ◽  
Ashok Kumar Srivastava
Keyword(s):  
Mechanical Properties ◽  
Impact Toughness ◽  
Retained Austenite ◽  
Bainitic Ferrite ◽  
Ferrite Matrix ◽  
Total Elongation ◽  
Matrix Structure ◽  
Medium Carbon ◽  
Base Steel ◽  
Mo Additions

In this study, the effects of Cr and Mo additions on mechanical properties of hot-forged medium carbon TRIP-aided bainitic ferrite (TBF) steel were investigated. If 0.5%Cr was added to the base steel with a chemical composition of 0.4%C, 1.5%Si, 1.5%Mn, 0.5%Al, and 0.05%Nb in mass%, the developed steel achieved the best combination of strength and total elongation. The best combination of strength and impact toughness was attained by multiple additions of 0.5%Cr and 0.2%Mo to the base steel. The excellent combination of strength and impact toughness substantially exceeded those of quenched and tempered JIS-SCM420 and 440 steels, although it was as high as those of 0.2%C TBF steels with 1.0%Cr and 0.2%Mo. The good impact toughness was mainly caused by uniform fine bainitic ferrite matrix structure and a large amount of metastable retained austenite.

Microstructure Evolution and Mechanical Properties of 780 MPa Hot Dip Galvanized Dual-Phase Steel

2010 ◽  
Vol 146-147 ◽  
pp. 1331-1335 ◽  
Author(s):  
Guo Bin Li ◽  
Zheng Zhi Zhao ◽  
Di Tang
Keyword(s):  
Mechanical Properties ◽  
Microstructure Evolution ◽  
Dual Phase Steel ◽  
Total Elongation ◽  
Annealing Process ◽  
Continuous Annealing ◽  
Dual Phase ◽  
Dp Steel ◽  
Gleeble 3500 ◽  
Soaking Temperature

The microstructure evolution of 780 MPa hot dip galvanized dual-phase (DP) steel at heating stages of the annealing process was analyzed using a Gleeble−3500 thermal/mechanical simulator. A multifunction continuous annealing simulator was employed to investigate the effect of annealing process on microstructure and mechanical properties of hot dip galvanized DP steel. The experimental results show that ferrite recovery and recrystallization, pearlite dissolution and austenite nucleation and growth take place in the annealing process of hot dip galvanized DP steel. The hardenability can be significantly improved by trace addition of vanadium. When the soaking temperature reaches 780 °C, the tensile strength and total elongation of DP steel can reach 785MPa and 15%, respectively. The microstructure of DP steel mainly consists of a mixture of ferrite and martensite.

Effects of Filler Incorporation Routes on Mechanical Properties of Low Density Polyethylene/Natural Rubber/Silica (LDPE/NR/Si) Composites

2014 ◽  
Vol 679 ◽  
pp. 154-157 ◽  
Author(s):  
Pei Ying Teoh ◽  
Abdulbaset Mohamed Erfeida ◽  
Xuan Viet Cao ◽  
Du Ngoc Uy Lan
Keyword(s):  
Mechanical Properties ◽  
Natural Rubber ◽  
Tensile Properties ◽  
Low Density Polyethylene ◽  
Tensile Fracture ◽  
Low Density ◽  
Tensile Fracture Surface ◽  
Roll Mill ◽  
Typical Morphology ◽  
Internal Mixer

Low density polyethylene (LDPE) and natural rubber (NR) filled silica composites were prepared by using internal mixer (Brabender) at 150°C and 50 rpm for 10 minutes. Silica was incorporated into polymer matrix by three mixing routes by using Brabender. In mixing I, filler was added into LDPE/NR blend. In mixing II, filler was added prior to LDPE, which was further compounded with NR. In mixing III, filled was pre-dispersed into NR using two-roll mill, after that the compound is blended with LDPE. The effects of filler incorporation routes on the morphological and tensile properties of prepared composites were studied. Observation from SEM result showed that silica tended to localize in NR phase than LDPE phase in the composite. In addition, silica filled LDPE/NR composite exhibited the highest tensile strength in mixing II and lowest in mixing III. Tensile fracture surface of the composites showed typical morphology of LDPE and NR phase depending on mixing methods. KEYWORDS: LDPE/NR, silica, mixing order, tensile properties, morphology

scholarly journals Effect of Temperature Scheme on Microstructure and Mechanical Properties during Medium Carbon Steel Warm Processing

Metals ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 77
Author(s):  
Hong-Bin Li ◽  
Lifeng Fan ◽  
Lian-Sheng Chen
Keyword(s):  
Mechanical Properties ◽  
Carbon Steel ◽  
Warm Rolling ◽  
Medium Carbon Steel ◽  
Effect Of Temperature ◽  
Warm Deformation ◽  
Homogeneous Microstructure ◽  
Medium Carbon ◽  
Gleeble 3500 ◽  
Strength And Ductility

Influence of temperature scheme on the microstructure and properties variation of medium carbon steel warm deformation was studied with testing equipment of Gleeble-3500, SEM, TEM, EBSD, and φ350 reversal rolling mill. The results show that the temperature of 650 facilitates the formation of ultrafine homogeneous microstructure. The microstructure formed during temperature range of 650–700 °C is relative homogeneous and fine. The mechanical properties of warm rolling are influenced by the cooling modes. The lower cooling rate is benefit to the combination of strength and ductility.

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