Effect of cold rolling and subsequent aging on tensile properties and thermoelastic coefficient of Ni-Span-C 902 superalloy

2020 ◽  
Vol 117 (4) ◽  
pp. 406
Author(s):  
Maryam Morakabati ◽  
Peyman Ahmadian ◽  
Mohammad Rasoul Moazami Goodarzi
Keyword(s):  
Elastic Modulus ◽  
Cold Rolling ◽  
Tensile Test ◽  
Tensile Properties ◽  
Aging Temperature ◽  
Tensile Tests ◽  
Subsequent Aging ◽  
Microstructural Evaluation ◽  
Different Temperatures ◽  
Cold Rolled

The influence of cold rolling and subsequent aging on tensile properties and thermoelastic coefficient (TEC) of Ni-Span-C 902 superalloy was investigated. The solution treated specimens conventionally cold rolled to 30–50% thickness reduction and subsequently aged at different temperatures ranging from 550 to 850 °C for 5 h. The results of room temperature tensile tests indicated that higher strength and elastic modulus are achieved by increasing the amount of reduction area from 30 to 50%. Also, the maximum tensile strength and elastic modulus are obtained in the specimens which were 50% cold-rolled and subsequently aged at 650 °C for 5 h. Microstructural evaluation revealed that fine and spherical γ’ phase with size of 80 ± 20 nm is precipitated during aging at 650 °C. By increasing aging temperature from 650 to 750 °C, coarse γ’ phase is obtained and consequently UTS is declined. The evolution of ɛ phase is observed as a result of aging at 850 °C. According to tensile test it can be demonstrated that ɛ phase decreases the UTS and increases the ductility of the alloy. Tensile test results in the range of 30–100 °C showed that by increasing the aging temperature from 550 to 650 °C, TEC increases and with increasing the amount of cold rolling from 30 to 50 pct, TEC decreases. Meanwhile the lowest TEC value is obtained with aging of the 50 pct cold-rolled specimens at 550 °C.

scholarly journals Tensile Properties and Damping Capacity of Cold-Rolled Fe-20Mn-12Cr-3Ni-3Si Damping Alloy

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 5975
Author(s):  
Jae-Hwan Kim ◽  
Jong-Min Jung ◽  
Hyunbo Shim
Keyword(s):  
Tensile Strength ◽  
Cold Rolling ◽  
Tensile Properties ◽  
Volume Fraction ◽  
High Strength ◽  
Damping Capacity ◽  
Austenite Stability ◽  
Ε Martensite ◽  
Cold Rolled ◽  
The Relationship

The tensile properties and damping capacity of cold-rolled Fe–20Mn–12Cr–3Ni–3Si alloys were investigated. The martensitic transformation was identified, including surface relief with a specific orientation and partial intersection. Besides, as the cold rolling degree increased, the volume fraction of ε-martensite increased, whereas α’-martensite started to form at the cold rolling degree of 15% and slightly increased to 6% at the maximum cold rolling degree. This difference may be caused by high austenite stability by adding alloying elements (Mn and Ni). As the cold rolling degree increased, the tensile strength linearly increased, and the elongation decreased due to the fractional increment in the volume of martensite. However, the damping capacity increased until a 30% cold rolling degree was approached, and then decreased. The irregular tendency of the damping capacity was confirmed, depicting that it increased to a specific degree and then decreased as the tensile strength and elongation increased. Concerning the relationship between the tensile properties and the damping capacity, the damping capacity increased and culminated, and then decreased as the tensile properties and elongation increased. The damping capacity in the high-strength area tended to decrease because it is difficult to dissipate vibration energy into thermal energy in alloys with high strength. In the low-strength area, on the other hand, the damping capacity increased as the strength increased since the increased volume fraction of ε-martensite is attributed to the increase in the damping source.

scholarly journals An assessment of static recrystallization in L-605 Cobalt-based superalloy

10.30544/231 ◽  
2016 ◽  
Vol 22 (4) ◽  
pp. 221-236
Author(s):  
Padina Ajami Ghaleh Rashidi ◽  
Hossein Arabi ◽  
Seyed Mehdi Abbasi
Keyword(s):  
Cold Rolling ◽  
Annealing Time ◽  
Annealing Temperature ◽  
Static Recrystallization ◽  
Microstructural Analysis ◽  
High Annealing ◽  
Microstructural Evaluation ◽  
Cold Rolled ◽  
Lower Temperature ◽  
Hot Rolled

In this research, the effect of cold rolling, annealing time and temperature on microstructure and hardness were studied in L-605 superalloy. A cast bar of L-605 alloy was hot rolled at 1200ºC. As the following, it was solutionized at 1230 ºC for 1 hour and finally was cold rolled by different amounts (i.e. 5-35 percent thickness reduction). The cold-rolled samples were heat treated for different times (i.e. 2-120 min.) at temperature range of 1068-1230 ºC in order to study their recrystallization behavior. The results of microstructural analysis indicated that static recrystallization is responsible for microstructural refinement and coarsening, so that an increase in the amounts of cold rolling resulted in a fully recrystallized microstructure at lower temperature. This analysis also indicated that annealing temperature is more effective than annealing time in grain growth. Microstructural evaluation as well as showed that carbides such as M7C3 and M23C6 which have been reported in some literature were not observed during rolling or annealing in this research. It is perhaps due to usage of high annealing temperatures or possibly due to their very low contents which was not possible for us to evaluate their formation with conventional methods. Hardness results revealed that higher annealing temperature lead to lower hardness values as expected.

Martensitic Transformation and Mechanical Properties of Fe-added Au-Cu-Al Shape Memory Alloy with Various Heat Treatment Conditions

2014 ◽  
Vol 1760 ◽  
Author(s):  
Akira Umise ◽  
Masaki Tahara ◽  
Kenji Goto ◽  
Tomonari Inamura ◽  
Hideki Hosoda
Keyword(s):  
Heat Treatment ◽  
Cold Rolling ◽  
Shape Memory ◽  
Yield Stress ◽  
Mechanical Treatment ◽  
Tensile Tests ◽  
Treatment Temperature ◽  
Shape Memory Properties ◽  
Cold Rolled ◽  
Thermo Mechanical Treatment

ABSTRACTIn order to improve shape memory properties of Au-Cu-Al based shape memory alloys, the possibility to utilize thermo-mechanical treatment was investigated in this study, and effects of heat-treatment temperature on microstructure, martensitic transformation and mechanical properties of cold-rolled Au-30Cu-18Al-2Fe (AuCuAlFe) alloy were clarified by X-ray diffraction analysis (XRD, differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and tensile tests at room temperature (RT). Here, Fe addition to AuCuAl improves ductility. Cold rolling with the thickness reduction of 30% was successfully carried out in AuCuAlFe at RT. An exothermic heat was observed in DSC at temperature from 402K, suggesting that recovery started at 402K. Besides, the transformation temperature hysteresis increased by the cold-rolling. The alloy was completely recrystallized after the heat treatment at 573K for 3.6ks. Tensile tests revealed that the yield stress was raised by cold rolling and largely by the subsequent heat treatment at 433K, which corresponded to the recovery start temperature by DSC. The yield stress decreased with increasing heat treatment temperature over 453K, probably due to recrystallization. AuCuAlFe cold-rolled and subsequent heat-treated at 573K exhibited the lowest yield stress as well as stress-plateau region, indicating that the thermo-mechanical treatment is effective to improve shape memory properties of Au-Cu-Al based alloys.

Study on the Effects of the Self-Healing Microcapsules on the Tensile Properties of Polymer Composite

2011 ◽  
Vol 299-300 ◽  
pp. 460-465 ◽  
Author(s):  
Li Zhang ◽  
Xiu Ping Dong ◽  
Hao Chen
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Elastic Modulus ◽  
Glass Fiber ◽  
Tensile Properties ◽  
Polymer Composite ◽  
Tensile Tests ◽  
The Self ◽  
Self Healing ◽  
Glass Fiber Reinforced

By designing different formulations of composites and adopting optimized technology including extrusion and molding, the different composites with various content microcapsules were prepared. The results of the tensile tests show that with the increasing content of self-healing microcapsules in the glass fiber reinforced nylon composites, the mechanical properties of the composites will change, i.e. tensile strength, elastic modulus will decrease. But there is little effect on the mechanical properties of the composite gears if the content of self-healing microcapsules is less than 3.5%, and the technology of self-healing microcapsules used in the polymer composite gear is feasible.

Effect of Severe Plastic Deformation on Mechanical Properties of Fe-Ni-Mn High Strength Steel

2009 ◽  
Vol 83-86 ◽  
pp. 16-23 ◽  
Author(s):  
H. Shirazi ◽  
Mahmoud Nili-Ahmadabadi ◽  
A. Fatehi ◽  
S. Hossein Nedjad
Keyword(s):  
Mechanical Properties ◽  
Cold Rolling ◽  
Equal Channel Angular Pressing ◽  
High Strength ◽  
Hardness Measurement ◽  
Aged Alloy ◽  
Martensitic Steels ◽  
Subsequent Aging ◽  
Angular Pressing ◽  
Cold Rolled

Fe-Ni-Mn martensitic steels show excellent age hardenability but suffer from embrittlement after aging. Discontinuous coarsening of grain boundary precipitates was found as the main source of embrittlement. Effect of cold rolling and equal channel angular pressing on the mechanical properties of an Fe-10Ni-7Mn steel was investigated. Cold rolling for 20%, 40%, 60%, 80% and 90% and equal channel angular pressing for four passes through the Bc route were carried out on a solution annealed material with subsequent aging at 753 K. Hardness measurement, tensile test and scanning electron microscopy were used to study mechanical properties and microstructural features of the as-deformed and aged alloys. Improvement in tensile properties of the as-deformed and aged alloys was found. A tensile strength of about 1840 MPa along with 3% elongation were determined for cold rolled by 90% thickness reduction and aged alloy, while conventional steel shows a premature fracture stress of 820 MPa with zero ductility. It was also indicated that after heavy cold rolling ductility increases in comparison to the equal channel angular pressed and aged alloy.

scholarly journals Effect of cold-rolling on mechanical properties of Haynes 25 cobalt-based superalloy

10.30544/248 ◽  
2017 ◽  
Vol 23 (1) ◽  
pp. 31-45 ◽  
Author(s):  
Padina Ajami Ghaleh Rashidi ◽  
Hossein Arabi ◽  
Seyed Mehdi Abbasi
Keyword(s):  
Cold Rolling ◽  
Tensile Properties ◽  
Annealing Time ◽  
Room Temperature ◽  
Crack Nucleation ◽  
Microstructural Analysis ◽  
Time Range ◽  
High Annealing ◽  
Cold Rolling And Annealing ◽  
Cold Rolled

Effect of cold-rolling and annealing time on the microstructure, hardness and the tensile properties of Haynes 25 superalloy at room-temperature and 760 °C were investigated in this research. Hot-rolled and solutionized alloy of Haynes 25 was subjected to cold-rolling with different amounts of reductions, i.e. 5%, 10%, 20%, 30% and 35%. After that, all cold-rolled samples were annealed at 1230 °C for a period of time from 2 to 120 min. Microstructural analysis showed that for annealing time range from 30 to 120 min, the rate of grains coarsening remained approximately stable in all cold-rolled samples. On the other hand, the hardness results showed that expected decreasing trend of hardness did not occur after annealing of the cold-rolled samples at 1230 °C; on the contrary, hardness increased moderately in the range time from 10 to 120 min. Tensile properties after annealing of the cold-rolled samples at room temperature and 760 °C decreased. Loss of the tensile properties can be related to the high annealing temperature. According to the experimental results, decreasing trend of tensile properties and increasing trend of hardness is linked to the formation of hcp phase after annealing at 1230 °C for 30 min. Even though the hcp phase is a hard phase, the interface between fcc and hcp phases provides suitable sites for crack nucleation and propagation.

scholarly journals Cervical Rotatory Manipulation Decreases Uniaxial Tensile Properties of Rabbit Atherosclerotic Internal Carotid Artery

2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Shaoqun Zhang ◽  
Ji Qi ◽  
Lei Zhang ◽  
Chao Chen ◽  
Shubhro Mondal ◽  
...  
Keyword(s):  
Elastic Modulus ◽  
Carotid Artery ◽  
Internal Carotid Artery ◽  
Tensile Properties ◽  
Internal Carotid ◽  
Tensile Tests ◽  
Normal Group ◽  
Uniaxial Tensile ◽  
Model Group ◽  
Main Effects

Objective. To investigate the effects of one of the Chinese massage therapies, cervical rotatory manipulation (CRM), on uniaxial tensile properties of rabbit atherosclerotic internal carotid artery (ICA).Methods. 40 male purebred New Zealand white rabbits were randomly divided into CRM-Model group, Non-CRM-Model group, CRM-Normal group, and Non-CRM-Normal group. After modeling (atherosclerotic model) and intervention (CRM or Non-CRM), uniaxial tensile tests were performed on the ICAs to assess the differences in tensile mechanical properties between the four groups.Results. Both CRM and modeling were the main effects affecting physiological elastic modulus (PEM) of ICA. PEM in CRM-Model group was 1.81 times as much as Non-CRM-Model group, while the value in CRM-Model group was 1.34 times as much as CRM-Normal group. Maximum elastic modulus in CRM-Model group was 1.80 times as much as CRM-Normal group. Max strains in CRM-Model group and Non-CRM-Model group were 30.98% and 28.71% lower than CRM-Normal group and Non-CRM-Normal group, respectively. However, whether treated with CRM or not, the uniaxial tensile properties of healthy ICAs were not statistically different.Conclusion. CRM may decrease the uniaxial tensile properties of rabbit arteriosclerotic ICA, but with no effect on normal group. The study will aid in the meaningful explanation of the controversy about the harmfulness of CRM and the suitable population of CRM.

{332}<113> Twinning Deformation in a Cold-Rolled Biocompatible Ti-Nb-Zr-Fe Alloy

2016 ◽  
Vol 258 ◽  
pp. 350-353
Author(s):  
Vasile Danut Cojocaru ◽  
Ion Cinca ◽  
Nicolae Serban ◽  
Doina Margareta Gordin ◽  
Mariana Lucia Angelescu ◽  
...  
Keyword(s):  
Elastic Modulus ◽  
Cold Rolling ◽  
Physical Properties ◽  
Titanium Alloys ◽  
Pole Figures ◽  
Low Elastic Modulus ◽  
Mechanical And Physical Properties ◽  
Deformation Features ◽  
Schmid Factor ◽  
Cold Rolled

In the present days titanium and titanium alloys are extensively studied and used as biomaterials due to their biological, mechanical and physical properties. During last year’s special attention was paid to β-Titanium alloys due to their low elastic modulus. The present study investigates the twinning deformation features occurred during multi-pass cold-rolling processing of a biocompatible Ti-Nb-Zr-Fe alloy. Twinning deformation features were investigated using EBDS analysis by means of Inverse Pole Figures (IPF’s), Pole Figures (IP’s) and computed Schmid factor (SF’s) for the possible {332}<113> twinning variants.

Assessment of Specimen Geometry for All-Weld Metal Tensile Test in Narrow Groove Welding

2013 ◽  
Author(s):  
Noé Mota-Solis ◽  
Eduardo Ruiz ◽  
Mauricio Pelcastre ◽  
Hector Quintanilla
Keyword(s):  
Weld Metal ◽  
Tensile Test ◽  
Tensile Properties ◽  
Tensile Tests ◽  
Specimen Geometry ◽  
Pipe Material ◽  
Seamless Pipe ◽  
Line Pipe ◽  
Testing Procedures ◽  
Groove Design

The development of adequate welding procedures for the offshore pipeline industry has required improvement of weld designs due to stringent field operations, e.g., deep and ultra-deep water application, strain-based design, weld overmatching, low temperature toughness, fatigue resistance, etc. Gas-metal arc welding (GMAW) procedures have required the optimization of the groove design, from conventional (wide opening) to narrow-groove (NG) solutions. The assessment of the weld metal tensile properties, based on international codes and specifications, is necessary to deliver full compliance and reliability of requirements for the girth weld performance. However; complexities arise in order to establish weld metal testing procedures, when narrow-groove design is used for welding a heavy-wall (HW) seamless pipe material. The latter requires the assessment of specimen geometry in HW line pipe in order to produce reliable measurements of all-weld metal tensile properties, which can be representative of the weld metal performance. The objective of the present work is to present the assessment in the differences on specimen geometry for all-weld metal tensile test (AWMTT). The work includes the welding of a HW seamless pipe material; 273.1 mm OD × 46 mm WT, X65 steel grade using STT®+GMAW, single-torch, as welding process, with narrow J-bevel, in 2° angle opening. Experiments considered the use of an ER80S-G solid wire as filler material for behavior analysis. The assessment methodology consisted in the machining of three different specimen geometries; strip, round and cross weld specimens were prepared for tensile tests. Efforts were dedicated to extracted tensile specimens avoiding heat affected zone areas in the specimen. Assessment of obtained results is based on tensile tests as well as the analysis of stress-strain data for the yielding behavior regarding the specimen geometry.

Sign in / Sign up

Export Citation Format

Share Document