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.

Effect of Annealing Temperature on Microstructures and Properties of Warmly Deformed SCRAM Steel

2014 ◽  
Vol 575 ◽  
pp. 315-321
Author(s):  
Yang Mou ◽  
Li Hong Xue ◽  
Qi Lai Zhou ◽  
Cai Xuan Lu ◽  
Jin Ping Suo ◽  
...  
Keyword(s):  
Annealing Temperature ◽  
Tensile Fracture ◽  
Tensile Fracture Surface ◽  
Helium Bubbles ◽  
Optimal Annealing Temperature ◽  
Lath Width ◽  
High Reduction ◽  
Gleeble 3500 ◽  
Reduction Of Area ◽  
Martensitic Lath

Effect of annealing temperature on microstructures and properties of warmly deformed SCRAM (Super-clean Reduced Activation Martensitic) steel on Gleeble-3500 thermo-simulation machine was investigated. The results showed that an increase in the annealing temperature can result in increasing the martensitic lath width from 0.48 um to 0.65 um and decreasing the dislocation density from 6.4×1015m-2to 2.8×1015m-2in SCRAM steel. The specimen exhibited high reduction of area and total elongations when the annealing temperature is up to 600 oC. The tensile fracture surface observation indicated that dimples became more uniform and deeper and cleavage fracture traces disappeared with the annealing temperature increasing. The irradiation-induced helium bubbles and hardening were observed in all the specimens after helium implantation to 1e + 17/cm2at 450 oC. The helium bubbles became larger but less when the annealing temperature increased. The optimal annealing temperature is 450 oC in this experiment.

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 Lath Width and Dislocation Density on Resistance to Irradiation of Warmly Deformed SCRAM Steel

2014 ◽  
Author(s):  
Yang Mou ◽  
Lihong Xue ◽  
Qilai Zhou ◽  
Caixuan Lu ◽  
Jinping Suo ◽  
...  
Keyword(s):  
Dislocation Density ◽  
Indentation Hardness ◽  
Warm Deformation ◽  
Helium Bubbles ◽  
Nano Indentation ◽  
Lath Width ◽  
Helium Implantation ◽  
Gleeble 3500 ◽  
Martensitic Lath ◽  
Dislocation Density Increase

The martensitic lath width (0.83 ± 0.45μm ∼ 0.48 ± 0.14 μm) and dislocation density (1.3 ± 0.3 × 1015 m−2 ∼ 6.4 ± 1.6 ×1015 m−2) change of Super-clean Reduced Activation Martensitic (SCRAM) steel caused by warm deformation on Gleeble-3500 thermo-simulation machine have been examined. The irradiation-induced helium bubbles and hardening were observed in all the specimens after helium implantation to 1e + 17/cm2 at 723 K. The helium bubbles became smaller and more numerous while the distribution was more homogeneous when the lath width decrease and dislocation density increase. The nano-indentation hardness indicated that the sample, the martensitic lath width is 0.83 ± 0.45μm and the dislocation density is 1.3 ± 0.3 × 1015 m−2, exhibited the maximum nano-indentation variation (ΔH) and the ΔH decreased with the lath width decreasing and dislocation density increasing. The hardening occurred in all helium implanted samples can mainly be ascribed to helium bubbles.

Research on the Microstructures and Mechanical Properties of Annealed Cold Upsetting AZ31 Magnesium Alloy

2009 ◽  
Vol 610-613 ◽  
pp. 826-830
Author(s):  
Tian Mo Liu ◽  
Wei Hui Hu ◽  
Qing Liu
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Annealing Temperature ◽  
Volume Fraction ◽  
Cold Upsetting ◽  
Cast Magnesium Alloys ◽  
Microstructures And Mechanical Properties ◽  
Cast Magnesium

The microstructures and mechanical properties of cold upsetting magnesium alloys were investigated upon anneal under different conditions. The results show that a large amount of twins were observed in the original grains of cold upsetting AZ31 magnesium alloys. The twins disappeared gradually and recrystal grains formed after anneal. The volume fraction of the recrystal grains increases as the strain of samples rises. Recrystal grain size grows large with the elevated annealing temperature. Recrystal grain size reduces at first and then grows as the annealing time is prolonged. In addition, compared with as-cast magnesium alloys, the yield strength of cold upsetting samples increase apparently due to grain refinement after anneals.

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.

Study on Microstructures and Mechanical Properties of Cold-Rolled C-Mn-Si-Al TRIP Steel

2010 ◽  
Vol 146-147 ◽  
pp. 678-681
Author(s):  
Zheng You Tang ◽  
Hua Ding
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Trip Steel ◽  
Retained Austenite ◽  
Volume Fraction ◽  
Total Elongation ◽  
Partial Substitution ◽  
Cold Rolled ◽  
Microstructures And Mechanical Properties

The effect of the partial substitution of Si by Al on the microstructures and the mechanical properties of cold rolled C-Mn-Si TRIP steel was investigated. The results show that the partial substitution of Si by Al could refine the microstructures, increase the volume fraction of ferrite and retained austenite. In addition, the excellent mechanical properties of the Al partial substituted TRIP steel could be obtained, the tensile strength, total elongation and strength-ductility of C-Mn-Si-Al TRIP steel are 739MPa, 38% and 28082MPa%, respectively.

Influence of Temperature Rise during Finishing Rolling on the Mechanical Properties of T8 Cord Steel

2011 ◽  
Vol 295-297 ◽  
pp. 997-1003
Author(s):  
Meng Wang ◽  
Li Ping Wang ◽  
Li Feng Wang ◽  
Long Fei Li
Keyword(s):  
Mechanical Properties ◽  
Temperature Rise ◽  
Cleavage Plane ◽  
Tensile Elongation ◽  
Tensile Tests ◽  
Tensile Fracture ◽  
Controlled Cooling ◽  
Normal Procedure ◽  
Reduction Of Area ◽  
Cooling Procedure

Different temperature rises during finishing rolling of T8 cord steel were obtained through normal procedure (process 1) and controlled cooling procedure (process 2), and its effects on the microstructure and the mechanical properties were studied. The microstructure of T8 cord steel obtained by process 1 consisted of clusters of coarser and inhomogeneity sorbite colonies, and that obtained by process 2 consisted of equiaxed and finer sorbite colonies, with the similar interlamellar spaces of sorbite cementite in the two microstructures. The results of tensile tests showed that the tensile strength of T8 cord steel obtained by process 2 was higher than that obtained by process1 by 20MPa, with higher reduction of area and tensile elongation. In addition, the tensile fracture of T8 cord steel obtained by process 1 consisted of a lot of lotus cleavage plane, while that of T8 cord steel obtained by process 2 mainly consisted of finer dimples. That indicated that the smaller temperature rise of process 2 during finishing rolling can improve the mechanical properties of T8 cord steel.

scholarly journals Effect of Rolling Temperature on Microstructure Evolution and Mechanical Properties of AISI316LN Austenitic Stainless Steel

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1557 ◽  
Author(s):  
Yi Xiong ◽  
Yun Yue ◽  
Tiantian He ◽  
Yan Lu ◽  
Fengzhang Ren ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Microstructure Evolution ◽  
Room Temperature ◽  
Volume Fraction ◽  
Parent Phase ◽  
Rolling Temperature ◽  
Tensile Fracture ◽  
Transformation Rate

The impacts of rolling temperature on phase transformations and mechanical properties were investigated for AISI 316LN austenitic stainless steel subjected to rolling at cryogenic and room temperatures. The microstructure evolution and the mechanical properties were investigated by means of optical, scanning, and transmission electron microscopy, an X-ray diffractometer, microhardness tester, and tensile testing system. Results showed that strain-induced martensitic transformation occurred at both deformation temperatures, and the martensite volume fraction increased with the deformation. Compared with room temperature rolling, cryorolling substantially enhanced the martensite transformation rate. At 50% deformation, it yielded the same fraction as the room temperature counterpart at 90% strain, while at 70%, it totally transformed the austenite to martensite. The strength and hardness of the stainless steel increased remarkably with the deformation, but the corresponding elongation decreased dramatically. Meanwhile, the tensile fracture morphology changed from a typical ductile rupture to a mixture of ductile and quasi-cleavage fracture. The phase transformation and deformation mechanisms differed at two temperatures, with the martensite deformation contributing to the former, and austenite deformation to the latter. Orientations between the transformed martensite and its parent phase followed the K–S (Kurdjumov–Sachs) relationship.

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