scholarly journals Heat-Affected-Zone Liquation Cracking in Welded Cast Haynes® 282®

Metals ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 29 ◽  
Author(s):  
Sukhdeep Singh ◽  
Joel Andersson
Keyword(s):  
Heat Treatment ◽  
Heat Affected Zone ◽  
Heat Treatments ◽  
Treatment Temperature ◽  
Mass Spectrometry Analysis ◽  
Liquation Cracking ◽  
Spectrometry Analysis ◽  
Thermomechanical Simulation ◽  
Common Understanding ◽  
Zone Liquation

Varestraint weldability testing and Gleeble thermomechanical simulation of the newly developed cast form of Haynes® 282® were performed to understand how heat-affected-zone (HAZ) liquation cracking is influenced by different preweld heat treatments. In contrast to common understanding, cracking susceptibility did not improve with a higher degree of homogenization achieved at a higher heat-treatment temperature. Heat treatments with a 4 h dwell time at 1120 °C and 1160 °C exhibited low cracking sensitivity, whereas by increasing the temperature to 1190 °C, the cracking was exacerbated. Nanosecond ion mass spectrometry analysis was done to characterize B segregation at grain boundaries that the 1190 °C heat treatment indicated to be liberated from the dissolution of C–B rich precipitates.

Thermal Processing of Polycrystalline NiTi Shape Memory Alloys

2004 ◽  
Vol 855 ◽  
Author(s):  
Carl P. Frick ◽  
Alicia M. Ortega ◽  
Jeff Tyber ◽  
Ken Gall ◽  
Hans J. Maier ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Shape Memory ◽  
Hot Rolling ◽  
Rolling Process ◽  
Heat Treatments ◽  
Treatment Temperature ◽  
Precipitate Size ◽  
Stress Strain ◽  
Transformation Temperatures ◽  
Strain Behavior

ABSTRACTThe objective of this study is to examine the effect of heat treatment on polycrystalline Ti-50.9 at.%Ni subsequent to hot-rolling. In particular we examine microstructure, transformation temperatures and mechanical behavior of deformation processed NiTi. The results constitute a fundamental understanding of the effect of heat treatment on thermal/stress induced martensite, which is critical for optimizing mechanical properties. The high temperature of the hot-rolling process caused recrystallization, recovery, and hindered precipitate formation, essentially solutionizing the NiTi. Subsequent heat treatments were carried out at various temperatures for 1.5 hours. Transmission Electron Microscopy (TEM) observations revealed that Ti3Ni4 precipitates progressively increased in size and changed their interface with the matrix from being coherent to incoherent with increasing heat treatment temperature. Accompanying the changes in precipitate size and interface coherency, transformation temperatures were observed to systematically shift, leading to the occurrence of the R-phase and multiple-stage transformations. Room temperature stress-strain tests illustrated a variety of mechanical responses for the various heat treatments, from pseudoelasticity to shape memory. The changes in stress-strain behavior are interpreted in terms of shifts in the primary martensite transformation temperatures, rather then the occurrence of the R-phase transformation. The results confirm that Ti3Ni4 precipitates can be used to elicit a desired isothermal stress-strain behavior in polycrystalline NiTi.

Characterization of heat affected zone liquation cracking in laser additive manufacturing of Inconel 718

2016 ◽  
Vol 90 ◽  
pp. 586-594 ◽  
Author(s):  
Yuan Chen ◽  
Ke Zhang ◽  
Jian Huang ◽  
Seyed Reza Elmi Hosseini ◽  
Zhuguo Li
Keyword(s):  
Additive Manufacturing ◽  
Heat Affected Zone ◽  
Inconel 718 ◽  
Laser Additive Manufacturing ◽  
Liquation Cracking ◽  
Zone Liquation

scholarly journals Grain Refinement and Improved Mechanical Properties of EUROFER97 by Thermo-Mechanical Treatments

2021 ◽  
Vol 11 (22) ◽  
pp. 10598
Author(s):  
Giulia Stornelli ◽  
Andrea Di Schino ◽  
Silvia Mancini ◽  
Roberto Montanari ◽  
Claudio Testani ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Tensile Strength ◽  
Heat Treatments ◽  
Treatment Temperature ◽  
Steel Plates ◽  
Experimental Campaign ◽  
Different Temperatures ◽  
Fusion Applications ◽  
Cold Rolled

EUROFER97 steel plates for nuclear fusion applications are usually manufactured by hot rolling and subsequent heat treatments: (1) austenitization at 980 °C for 30 min, (2) rapid cooling and (3) tempering at 760 °C for 90 min. An extended experimental campaign was carried out with the scope of improving the strength of the steel without a loss of ductility. Forty groups of samples were prepared by combining cold rolling with five cold reduction ratios (20, 40, 50, 60 and 80%) and heat treatments at eight different temperatures in the range 400–750 °C (steps of 50 °C). This work reports preliminary results regarding the microstructure and mechanical properties of all the cold-rolled samples and the effects of heat treatments on the samples deformed with the greater CR ratio (80%). The strength of deformed samples decreased as heat treatment temperature increased and the change was more pronounced in the samples cold-rolled with greater CR ratios. After heat treatments at temperature up to 600 °C yield stress (YS) and ultimate tensile strength (UTS) of samples deformed with CR ratio of 80% were significantly larger than those of standard EUROFER97 but ductility was lower. On the contrary, the treatment at 650 °C produced a fully recrystallized structure with sub-micrometric grains which guarantees higher strength and comparable ductility. The work demonstrated that EUROFER97 steel can be strengthened without compromising its ductility; the most effective process parameters will be identified by completing the analyses on all the prepared samples.

Glancing Angle X-Ray Analysis of Titanium Copper Compound Formations

1984 ◽  
Vol 40 ◽  
Author(s):  
P. A. Psaras ◽  
D. Gupta
Keyword(s):  
Heat Treatment ◽  
Heat Treatment Temperature ◽  
Rutherford Backscattering Spectrometry ◽  
Treatment Temperature ◽  
Rutherford Backscattering ◽  
Copper Compound ◽  
X Ray ◽  
Spectrometry Analysis ◽  
Glancing Angle ◽  
Ideal Stoichiometry

AbstractTitanium copper compound formations have been studied via Seeman Bohlin x-ray diffractometry and Rutherford backscattering spectrometry. The heat treatment temperature range was 350°C to 475°C and th heat treatment times ranged from 0 to 240 minutes. Tetragonal gamma TiCu formed first at ˜350°C and was sequentially followed by orthorhombic TiCu3 at ˜400°C. From Rutherford backscattering spectrometry analysis it was concluded that the second TiCu3 compound deviated from ideal stoichiometry to a nonstoichiometric Ti0.88Cu3.12 composition

EPR STUDY OF Fe3+ AND Mn2+ DOPED AMORPHOUS AND CRYSTALLINE ALUMINUM BORATES

2000 ◽  
Vol 14 (01) ◽  
pp. 1-6 ◽  
Author(s):  
S. SIMON ◽  
I. ARDELEAN ◽  
M. PETEANU ◽  
M. POP ◽  
R. STEFAN
Keyword(s):  
Heat Treatment ◽  
Disordered Systems ◽  
Matrix Effects ◽  
Sol Gel ◽  
Heat Treatments ◽  
Treatment Temperature ◽  
Aluminum Borate ◽  
Paramagnetic Resonance ◽  
The Matrix ◽  
Crystalline Alumina

Amorphous and crystalline aluminum borates prepared by sol–gel method doped with iron and manganese were studied by electron paramagnetic resonance in order to determine the matrix effects on Fe3+ and Mn2+ environments during their consolidation by heat treatment up to 860°C. In amorphous matrices, after heat treatments up to 600°C, the Fe3+ environment is almost unaffected but the vicinity of Mn2+ ions is relatively strongly disordered. In partial crystalline alumina and aluminum borate samples, obtained after heat treatments applied at 860°C, the Fe3+ sites are subjected to completely different crystalline fields, as regards intensity and symmetry. If in crystalline alumina we have both sites typical for α and γ phases in crystalline aluminum borate, the well-known spectrum of Fe3+ in disordered systems seems to be solved, suggesting more than one well-defined site. In the case of manganese-doped samples, only a diminishing of hyperfine resolution with increasing heat treatment temperature is observed as a result of environment distortion by improvement of alumina borate sample crystallinity.

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