Quantification of Elemental Segregation to Lath and Grain Boundaries in Low-Alloy Steel by STEM X-Ray Mapping Combined with the ζ-Factor Method

2003 ◽  
Vol 94 (3) ◽  
pp. 307-316 ◽  
Author(s):  
M. Watanabe ◽  
D. B. Williams
Keyword(s):  
Grain Boundaries ◽  
Alloy Steel ◽  
Low Alloy Steel ◽  
X Ray ◽  
Factor Method ◽  
Elemental Segregation

Nb segregation at prior austenite grain boundaries and defects in high strength low alloy steel during cooling

2017 ◽  
Vol 115 ◽  
pp. 165-169 ◽  
Author(s):  
Xianglong Li ◽  
Ping Wu ◽  
Ruijie Yang ◽  
Shoutian Zhao ◽  
Shiping Zhang ◽  
...  
Keyword(s):  
Grain Boundaries ◽  
Alloy Steel ◽  
Prior Austenite ◽  
High Strength ◽  
Low Alloy Steel ◽  
Austenite Grain ◽  
Prior Austenite Grain

The influence of Ni on the microstructure and corrosion resistance of high-strength low alloy steel in the Cl-containing environment

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Dan Wang ◽  
Qingdong Zhong ◽  
Jian Yang ◽  
Shujian Zhang
Keyword(s):  
Corrosion Resistance ◽  
Alloy Steel ◽  
Photoelectron Spectroscopy ◽  
Hsla Steel ◽  
Electrochemical Techniques ◽  
High Strength ◽  
Low Alloy Steel ◽  
Transfer Resistance ◽  
Content Type ◽  
X Ray

Purpose This paper aims to search the optimum content of Ni on the microstructure, phase and electrochemical behavior of high-strength low alloy (HSLA) steel in the 3.5 wt.% NaCl solution. Design/methodology/approach The microstructure and corrosion resistance of Ni-containing HSLA steel in the simulated marine environment was studied by optical microscopy, scanning electron microscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and electrochemical techniques. Findings The sample containing 3.55 wt.% of nickel exhibited a finer grain size of 10 μm and a lower icorr of 2.169 µA cm−2. The XRD patterns showed that the Fe-Cr-Ni solid solution, FeC and Cr3C2 were observed in samples when Ni was added. Besides, the 3.55 wt.% of nickel addition enhanced the charge transfer resistance of the low alloy steel which suggested the sample possessed excellent inhibition of electrochemical reaction and corrosion resistance. The XPS spectrum suggested that nickel was beneficial to improve the corrosion resistance of steel by forming protective oxides, and the ratio of Fe2+/Fe3+ in protective oxides was increased. Practical implications Finding the comprehensive performance of HSLA steel which can be applied to unmanned surface vehicles in marine operations. Originality/value This study has a guiding significance for optimizing the composition of HSLA steel in a Cl- containing environment.

Laboratory Computer for the High Speed Analysis of High and Low Alloy Steel

1974 ◽  
Vol 28 (5) ◽  
pp. 467-474 ◽  
Author(s):  
Friedrich Strieker ◽  
Paul Friedhoff ◽  
Manfred Heinen ◽  
Jochen Brauner
Keyword(s):  
Alloy Steel ◽  
High Speed ◽  
Fluorescence Analysis ◽  
Low Alloy Steel ◽  
Laboratory Computer ◽  
X Ray ◽  
Routine Work ◽  
High Speed Analysis ◽  
Evaluation Of Data ◽  
Spectral Laboratory

The evaluation of data is presented for routine work in an x-ray fluorescence analysis spectral laboratory. The plotting of calibration and correction curves for x-ray fluorescence analysis of steels with high and low alloy content is described.

Impact of Energy-Dispersive Spectrometry in Materials Science Microanalysis

1998 ◽  
Vol 4 (6) ◽  
pp. 567-575 ◽  
Author(s):  
David B. Williams
Keyword(s):  
Grain Boundaries ◽  
Energy Dispersive Spectrometry ◽  
Equilibrium Phase ◽  
Boundary Segregation ◽  
Temper Embrittlement ◽  
Energy Dispersive ◽  
Small Scale ◽  
X Ray ◽  
Elemental Segregation

X-ray microanalysis of materials using energy-dispersive spectrometry (EDS) has made the greatest impact in studies of compositional changes at atomic-level interfaces. The small physical dimensions of the silicon detector make EDS the X-ray analyzer of choice for analytical transmission electron microscopy (AEM). X-ray analysis of thin foils in the AEM has contributed to our understanding of elemental segregation to interphase interfaces and grain boundaries, as well as other planar defects. Measurement of atomic diffusion on a small scale close to interphase interfaces has permitted determination of substitutional atomic diffusivities several orders of magnitude smaller than previously possible and has also led to the determination of low-temperature equilibrium phase diagrams through the measurement of local interface compositions. Elemental segregation to grain boundaries is responsible for such deleterious behavior as temper embrittlement, stress-corrosion cracking, and other forms of intergranular failure. On the other hand, segregation can bring about improvement in behavior: sintering aids in ceramics and de-embrittlement of intermetallics. EDS in the AEM has been responsible for quantitative analysis of all aspects of the segregation process and, more recently, in combination with electron energy-loss spectrometry (EELS) has given insight into why boundary segregation results in such significant macroscopic changes in properties.

scholarly journals Analysis of Elemental Segregation in a Microalloyed Cast Steel

2013 ◽  
Vol 652-654 ◽  
pp. 2465-2468 ◽  
Author(s):  
Jing Wei Zhao ◽  
Zheng Yi Jiang ◽  
Dong Bin Wei
Keyword(s):  
Grain Boundary ◽  
Grain Boundaries ◽  
Cast Steel ◽  
Central Zone ◽  
Energy Dispersive ◽  
Surface Zone ◽  
Quantitative Investigation ◽  
X Ray ◽  
Elemental Segregation

Quantitative investigation is made on the elemental segregation in different zones of a heavy microalloyed cast steel by energy dispersive X-ray spectroscopy. It is demonstrated that C shows serious segregation tendency than that of Mn and Si, and the degree of C segregation in the surface zone is higher than that in the central zone. C enrichment is generally observed at both dendrite arm and grain boundaries, and more C segregation at dendrite arm boundary in contrast to that at grain boundary is found in this steel. The distribution of C concentration shows a decreased trend from root to tip along the dendrite arm boundary. The C concentration at trigeminal boundary intersection shows higher level than that at other position of the grain boundaries.

On interactions amongst trace and alloying elements at the grain boundaries of a low alloy steel

1987 ◽  
Vol 35 (12) ◽  
pp. 2995-3000 ◽  
Author(s):  
R.D.K. Misra ◽  
T.V. Balasubramanian ◽  
P.Rama Rao
Keyword(s):  
Grain Boundaries ◽  
Alloy Steel ◽  
Alloying Elements ◽  
Low Alloy Steel
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