scholarly journals Performance of Maraging Steel Sleeves Produced by SLM with Subsequent Age Hardening

Materials ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3408 ◽  
Author(s):  
Piotr Tyczyński ◽  
Zbigniew Siemiątkowski ◽  
Piotr Bąk ◽  
Krzysztof Warzocha ◽  
Mirosław Rucki ◽  
...  
Keyword(s):  
Maraging Steel ◽  
Hyperfine Magnetic Field ◽  
Work Conditions ◽  
Salt Bath ◽  
Fatigue Tests ◽  
Load Test ◽  
Age Hardening ◽  
Pulse Load ◽  
Standard Samples ◽  
Spectrometry Analysis

In the paper, the researches on sleeves made out of maraging steel 1.2709 using selective laser melting (SLM) technology are presented. This additive technology is recognized as favorable for the environment, due to 100% use of material and durability of manufactured details. The fabricated sleeves underwent subsequent tests, in particular, microhardness, porosity and homogeneity of the material was examined before and after heat treatment and salt bath nitrocarburizing process. Two kinds of fatigue tests were performed. The first consisted of the typical sinusoidal alternating load, the other was the high pressure pulse load test close to the real work conditions. It is of high importance that the fatigue strength of the tested sleeves is considerably higher than that of the similarly produced details shaped as a standard samples for tensile stress. The Mössbauer spectrometry analysis of hyperfine magnetic field distributions proved that SLM did not change considerably the martensite structure at atomic level.

Fatigue Strength of Maraging Steel at Elevated Temperatures

2008 ◽  
Vol 385-387 ◽  
pp. 161-164 ◽  
Author(s):  
T. Iwamoto ◽  
Norio Kawagoishi ◽  
Nu Yan ◽  
Eiji Kondo ◽  
Kazuhiro Morino
Keyword(s):  
Elevated Temperature ◽  
Fatigue Strength ◽  
Maraging Steel ◽  
Fracture Mechanism ◽  
Elevated Temperatures ◽  
Surface Oxidation ◽  
Fatigue Tests ◽  
Age Hardening ◽  
Effect Of Temperature ◽  
Rotating Bending Fatigue

Rotating bending fatigue tests were carried out to investigate the effects of temperature on the fatigue strength and the fracture mechanism of an 18 % Ni maraging steel at room and elevated temperatures of 473K and 673K. Fatigue strength was higher at elevated temperatures than at room temperature, though static strength was decreased by softening at elevated temperature. There was no effect of temperature on crack morphology and fracture mechanism. On the other hand, during fatigue process at elevated temperature, the specimen was age-hardened and the specimen surface was oxide. That is, the increase in fatigue strength at elevated temperature was mainly caused by the increase in hardness due to age-hardening and suppression of a crack initiation due to surface oxidation.

Fatigue Behavior of Age-Hardening Cu-6Ni-1.5Si Alloys with Different Grain Sizes

2021 ◽  
Vol 1016 ◽  
pp. 125-131
Author(s):  
Masahiro Goto ◽  
T. Yamamoto ◽  
S.Z. Han ◽  
J. Kitamura ◽  
J.H. Ahn ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Grain Size ◽  
Fatigue Strength ◽  
Solution Heat Treatment ◽  
Fatigue Behavior ◽  
Fatigue Tests ◽  
The Other ◽  
Age Hardening ◽  
Grain Sizes ◽  
Thermomechanical Processes

On the thermomechanical treatments of Cu-Ni-Si alloy, cold-rolling (CR) before solution heat treatment (SHT) is commonly conducted to eliminate defects in a casting slab. In addition, a rolling is applied to reduce/adjust the thickness of casting slab before SHT. In a heavily deformed microstructure by CR, on the other hand, grain growth during a heating in SHT is likely to occur as the result of recrystallization. In general, tensile strength and fatigue strength tend to decrease with an increase in the grain size. However, the effect of difference in grain sizes produced by with and without CR before SHT on the fatigue strength is unclear. In the present study, fatigue tests of Cu-6Ni-Si alloy smooth specimens with a grain fabricated through different thermomechanical processes were conducted. The fatigue behavior of Cu-Ni-Si alloy was discussed.

Three Ways of Sampling and Fatigue Test Results of Steel P92

2014 ◽  
Vol 891-892 ◽  
pp. 273-277
Author(s):  
Josef Volák ◽  
Zbynek Bunda
Keyword(s):  
Mechanical Properties ◽  
Power Plant ◽  
Fatigue Test ◽  
Fatigue Tests ◽  
Energy Industry ◽  
Fatigue Properties ◽  
Test Results ◽  
Steam Turbines ◽  
Standard Samples ◽  
Energy Component

This paper describes the fatigue properties of the steel P92. This material is widely used in the energy industry, especially for pipes and pipe bends of supercritical steam turbines. Steel P92 is alloyed with 2 % of tungsten compared to steel P91. This increases a creep strenght of the material. It is possible to reduce wall thickness of the P92 pipe up to about 20%. Fatigue tests were carried out on standard samples and compared with SFT samples (Small Fatigue Test). Using the device SSam 2 made by company Rolce Royce, it is possible to gently remove a samples from energy component without power plant shutdowns. Consider these correlations, i tis possible to determine mechanical properties of the material from small amount of removed experimental material.

Optimization of Ageing Parameters of a Low Nickel Maraging Steel

2010 ◽  
Vol 636-637 ◽  
pp. 471-477 ◽  
Author(s):  
M. Cabeza ◽  
G. Castro ◽  
P. Merino ◽  
G. Pena ◽  
M. Román ◽  
...  
Keyword(s):  
Maraging Steel ◽  
Structural Changes ◽  
Precipitation Hardening ◽  
Age Hardening ◽  
Scanning Calorimetry ◽  
Hardening Treatment ◽  
Depth Study ◽  
Final Selection ◽  
Selection Of

In the present work the age hardening parameters of a 14Ni (200) maraging steel are studied in order to optimize mechanical properties of the steel. The initial characterization of the as received solution annealed steel has been carried out by optical and scanning electron microscopy (LOM and SEM), and hardness measurements. To identify the structural changes during ageing, differential scanning calorimetry (DSC) tests were performed. Different time-temperature combinations were considered for the precipitation hardening treatment of as-quenched material samples. After hardness measurements, three of these treatments were selected for an in depth study. The obtained microstructure at the maximum hardness peaks then analysed (LOM, SEM and TEM) and mechanical behaviour (strength, toughness and wear resistance) was studied for the final selection of the age hardening conditions.

Effect of Austempering Temperature on High Cycle Fatigue Behavior of an Austempered Ductile Iron (ADI)

2010 ◽  
Vol 457 ◽  
pp. 493-498 ◽  
Author(s):  
Sasan Yazdani ◽  
Amir Sadighzadeh Benam ◽  
Behzad Avishan
Keyword(s):  
Fatigue Life ◽  
Volume Fraction ◽  
Fatigue Behavior ◽  
Salt Bath ◽  
Fatigue Tests ◽  
Chemical Compositions ◽  
X Ray Diffraction ◽  
Test Pieces ◽  
Rotating Bending Fatigue ◽  
Austempering Temperature

Ductile irons with chemical compositions of Fe-3.6%C-2.6%Si-0.50%Cu-0.51%Ni were cast into standard keel blocks. Austenitizing heat treatment was carried out on test pieces at 875°C followed by austempering at 320, 365 and 400°C for times within the austempering processing window in a salt bath furnace. Rotating bending fatigue tests were performed with Roell Amsler UBM 200™ equipment at 3500 rpm at room temperature. Metallography and X-ray diffraction techniques were used to evaluate the fatigue life. Results indicate an increase of 10, 20 and 24% in fatigue life for specimens austempered at temperatures of 320, 365 and 400°C respectively, compared to that of as cast samples. According to the XRD test results; there is an increase in volume fraction of high carbon austenite by increasing the austempering temperature.

Study of Age Hardening Behavior in a 350 Grade Maraging Steel

2015 ◽  
pp. 3-10
Author(s):  
Leandro Gomes de Carvalho ◽  
Ronald Lesley Plaut ◽  
Marcelo Aquino de Martorano ◽  
Angelo Fernando Padilha
Keyword(s):  
Maraging Steel ◽  
Age Hardening ◽  
Hardening Behavior

scholarly journals Possibility of Scanning Electron Microscope Observation and Energy Dispersive X-Ray Analysis in Microscale Region of Insulating Samples Using Diluted Ionic Liquid

2012 ◽  
Vol 18 (2) ◽  
pp. 365-370 ◽  
Author(s):  
Susumu Imashuku ◽  
Tetsuo Kawakami ◽  
Long Ze ◽  
Jun Kawai
Keyword(s):  
Ionic Liquid ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Energy Dispersive ◽  
Light Elements ◽  
Standard Samples ◽  
X Ray ◽  
Spectrometry Analysis ◽  
Sem Observation ◽  
Scanning Electron

AbstractThe possibility of scanning electron microscope (SEM) observation and energy dispersive X-ray (EDX) spectrometry analysis in microscale regions of insulating samples using diluted ionic liquid was investigated. It is possible to obtain clear secondary electron images of insulating samples such as a rock and mineral at 5,000 times magnification by dropping 10 μL of 1 wt% of 1-ethyl-3-methylimidazolium acetate (EMI-CH3COO) diluted with ethanol onto the samples. We also obtained EDX spectra of the samples in microscale regions (∼5 μm2) without overlapping EDX spectra of other minerals with different composition. It might be possible to perform quantitative analysis of the samples if a method that does not need standard samples is applied or an X-ray detector sensitive for light elements was attached. The method of dropping 1 wt% EMI-CH3COO diluted with ethanol onto insulating samples is useful for SEM observation, EDX analysis in microscale regions, and the preservation of scarce rock and mineral samples because ionic liquid can be easily removed with acetone.

scholarly journals Short-Time Ageing of MS350 Maraging Steel with and Without Plastic Deformation

2014 ◽  
Vol 59 (2) ◽  
pp. 513-520 ◽  
Author(s):  
J. Marcisz ◽  
J. Stępień
Keyword(s):  
Plastic Deformation ◽  
Dislocation Density ◽  
Maraging Steel ◽  
Age Hardening ◽  
Temporary Increase ◽  
Flow Forming ◽  
Forward Flow ◽  
Peak Aged ◽  
Thin Walled ◽  
Short Time

Abstract The age hardening behaviour of MS350 maraging steel both in undeformed specimens and in specimens deformed immediately after ageing was studied. Experiments of short-time (15, 30 and 60 s) ageing at temperature up to 600°C were performed. It was found that after ageing at 480-500°C for 15-60 s without deformation the hardness reached the 450-525 HV. The time of ageing at 600°C to reach hardness 600 HV was 15 seconds. No precipitation in specimen aged at 500°C for 60 s was found in TEM and HRTEM investigations. Deformation immediately after ageing intensifies the process of hardening caused by temporary increase of temperature and increase of dislocation density. The hardness of specimens aged for 30 s and then deformed at 480-550°C was similar to the hardness at peak aged conditions (480°C/4h) and reached 600-630 HV. Material produced in industrial trials of cold forward flow forming and following laboratory ageing was analyzed. Increase of hardness from 370 HV to 590-630 HV for specimens taken from thin walled flow formed tube as a result of ageing at 460-490°C for 30 minutes occurred.

scholarly journals Mechanical Strength and Fatigue Fracture Analysis on Al-Zn-Mg Alloy with the Influence of Creep Aging Process

2021 ◽  
Vol 2021 ◽  
pp. 1-5
Author(s):  
Muruganantham Ponnusamy ◽  
Bhanu Pratap Pulla ◽  
T. Sathish ◽  
Sivakumar Karthikeyan ◽  
S. Ravindran ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Constant Load ◽  
Fatigue Tests ◽  
Mg Alloy ◽  
Age Hardening ◽  
3D Profilometry ◽  
Time Period ◽  
Creep Characteristics ◽  
Temperature Levels ◽  
Increasing Temperature

The Al-Zn-Mg alloy comes under the aluminium alloy; it possesses good capability of age hardening and superior strength in contrast to other alloys. The numbers of creep aging experiments are conducted with the support of different temperature levels such as 180, 200, and 2000°C. The effects of tests are reflected on the tensile test and fatigue tests; the temperature and stress directly affects the creep characteristics, mechanical strength, and fatigue performance of the Al-Zn-Mg alloy. The time period of the creep test is maintained as 15 hrs with constant load of 200 MPa and 220 MPa. The increasing temperature increases the tensile strength and fatigue life of the Al-Zn-Mg alloy under initial condition; furthermore, continuous increment reduces the strength and fatigue existence. In the fatigue test, the fatigue span of the Al-Zn-Mg is extremely enhanced by the application of creep aging at a particular temperature. The 3D profilometry image visibly shows the influence of temperature in forming a fracture in fatigue analysis through microstructure analysis.

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