Embrittlement of maraging steel N18K8M3TYu after slow cooling from high temperatures

1972 ◽  
Vol 14 (10) ◽  
pp. 863-865
Author(s):  
Yu. A. Larichev ◽  
A. F. Goncharov ◽  
P. A. Prokhorov
Keyword(s):  
Maraging Steel ◽  
High Temperatures ◽  
Slow Cooling

scholarly journals Characteristics of the Cu–18.84 at.%Al–10.28 at.%Mn–1.57 at.%Ag alloy after slow cooling from high temperatures

2015 ◽  
Vol 121 (3) ◽  
pp. 1233-1238 ◽  
Author(s):  
R. A. G. Silva ◽  
A. Paganotti ◽  
A. T. Adorno ◽  
C. M. A. Santos ◽  
T. M. Carvalho
Keyword(s):  
High Temperatures ◽  
Slow Cooling

scholarly journals Mechanical Spectroscopy Of Ordered Binary Au-Cu

2015 ◽  
Vol 60 (3) ◽  
pp. 2093-2096 ◽  
Author(s):  
I. Tkalcec ◽  
D. Mari ◽  
R. Schaller
Keyword(s):  
Single Crystal ◽  
High Temperatures ◽  
Low Frequency ◽  
Ordered Structure ◽  
Mechanical Spectroscopy ◽  
Antiphase Boundaries ◽  
Slow Cooling ◽  
Ordered Structures ◽  
Frequency Peak ◽  
Lower Background

Abstract We have studied a binary Au-Cu single crystal by mechanical spectroscopy. Upon very slow cooling from high temperatures, additional relaxation peaks arise at lower frequencies in isothermal spectra after the disappearing of the Zener peak below 665 K due to ordering. A high transient peak is visible at 660 K and it progressively disappears on cooling until 625 K. Another high peak is clearly visible upon following heating until 660 K. Above that temperature it decreases in parallel with the increase of the Zener peak. If the ordered structure is obtained by slowly heating the sample that has been quenched from the disordered state, no low-frequency peak is visible in the isothermal spectra, only a much lower background, which further decreases in parallel with the reappearance of the Zener peak. The low frequency relaxations are possibly due to the movement of antiphase boundaries and twin interfaces in the ordered structures.

Transformations in maraging steel 03Kh11N10M2T heated to high temperatures

1978 ◽  
Vol 20 (12) ◽  
pp. 996-1000
Author(s):  
Ya. N. Malinochka ◽  
S. I. Krasnikova ◽  
S. G. Chernyavskaya ◽  
N. E. Pavlenko
Keyword(s):  
Maraging Steel ◽  
High Temperatures ◽  
Steel 03Kh11n10m2t

In situ REM imaging of surface processes on ceramic bulk crystals from 300 to 1670 K in a conventional TEM

1991 ◽  
Vol 49 ◽  
pp. 660-661
Author(s):  
Z. L. Wang ◽  
J. Bentley
Keyword(s):  
High Temperatures ◽  
Image Resolution ◽  
Atomic Processes ◽  
Crystal Surfaces ◽  
Beam Radiation ◽  
Surface Areas ◽  
Transmission Electron ◽  
Reflection Electron Microscopy ◽  
Gas Reactions

Studying the behavior of surfaces at high temperatures is of great importance for understanding the properties of ceramics and associated surface-gas reactions. Atomic processes occurring on bulk crystal surfaces at high temperatures can be recorded by reflection electron microscopy (REM) in a conventional transmission electron microscope (TEM) with relatively high resolution, because REM is especially sensitive to atomic-height steps.Improved REM image resolution with a FEG: Cleaved surfaces of a-alumina (012) exhibit atomic flatness with steps of height about 5 Å, determined by reference to a screw (or near screw) dislocation with a presumed Burgers vector of b = (1/3)<012> (see Fig. 1). Steps of heights less than about 0.8 Å can be clearly resolved only with a field emission gun (FEG) (Fig. 2). The small steps are formed by the surface oscillating between the closely packed O and Al stacking layers. The bands of dark contrast (Fig. 2b) are the result of beam radiation damage to surface areas initially terminated with O ions.

Microstructure of resistance spot welding of maraging steels

1990 ◽  
Vol 48 (4) ◽  
pp. 900-901
Author(s):  
I. Neuman ◽  
S.F. Dirnfeld ◽  
I. Minkoff
Keyword(s):  
Maraging Steel ◽  
Spot Welding ◽  
Lath Martensite ◽  
Base Material ◽  
Aging Treatment ◽  
High Strength ◽  
Maraging Steels ◽  
Heat Treated ◽  
Current Cycle ◽  
Welding Processes

Experimental work on the spot welding of Maraging Steels revealed a surprisingly low level of strength - both in the as welded and in aged conditions. This appeared unusual since in the welding of these materials by other welding processes (TIG,MIG) the strength level is almost that of the base material. The maraging steel C250 investigated had the composition: 18wt%Ni, 8wt%Co, 5wt%Mo and additions of Al and Ti. It has a nominal tensile strength of 250 KSI. The heat treated structure of maraging steel is lath martensite the final high strength is reached by aging treatment at 485°C for 3-4 hours. During the aging process precipitation takes place of Ni3Mo and Ni3Ti and an ordered solid solution containing Co is formed.Three types of spot welding cycles were investigated: multi-pulse current cycle, bi-pulse cycle and single pulsle cycle. TIG welded samples were also tested for comparison.The microstructure investigations were carried out by SEM and EDS as well as by fractography. For multicycle spot welded maraging C250 (without aging), the dendrites start from the fusion line towards the nugget centre with an epitaxial growth region of various widths, as seen in Figure 1.

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