Investigation on Manganese Sulfide Inclusion Sizes in 50CrMo4 Steels by means of Fractography, Micrograph Analysis and Immersion Ultrasound

2009 ◽  
Vol 46 (3) ◽  
pp. 123-136
Author(s):  
Cornelius Temmel ◽  
Birger Karlsson ◽  
Ketil Torresvoll ◽  
Christopher Fallqvist
Keyword(s):  
Manganese Sulfide ◽  
Sulfide Inclusion ◽  
Manganese Sulfide Inclusion

Polymorphism and Formation Mechanism of Nanobipods in Manganese Sulfide Nanocrystals Induced by Temperature or Pressure

2012 ◽  
Vol 116 (5) ◽  
pp. 3292-3297 ◽  
Author(s):  
Xinyi Yang ◽  
Yingnan Wang ◽  
Kai Wang ◽  
Yongming Sui ◽  
Meiguang Zhang ◽  
...  
Keyword(s):  
Formation Mechanism ◽  
Manganese Sulfide ◽  
Sulfide Nanocrystals

Ab-Initio Calculations of the Electronic Structure and Properties of Titanium Carbosulfide

1995 ◽  
Vol 408 ◽  
Author(s):  
Bala Ramalingam ◽  
Michael E. McHenry ◽  
Warren M. Garrison ◽  
James M. MacLaren
Keyword(s):  
Ab Initio Calculations ◽  
Ab Initio ◽  
Ground State ◽  
Manganese Sulfide ◽  
Structure And Properties ◽  
Host Matrix ◽  
Inclusion Phase ◽  
Equilibrium Lattice Constant ◽  
Volume Curve ◽  
Titanium Carbosulfide

AbstractTitanium carbosulfide (Ti2CS) is frequently found as an inclusion phase in Ti - containing steels. It is of considerable interest because, whenever present in preference to the more common manganese sulfide (MnS), it significantly improves the toughness (a very desirable property) of the steel. Currently, to the best of our knowledge, there is no data, either computational or experimental, regarding the structural properties of Ti2CS. This data is needed to understand the influence of the Ti2CS inclusions on the toughness of the host material.In this paper, our results from the ab-initio calculations, using the LKKR-ASA (Layer Korringa Kohn Rostoker method in the Atomic Spheres Approximation) on the equilibrium ground state properties of bulk Ti2CS are presented and discussed. In particular, attention is focused upon (a) the Energy – Atomic Volume curve generated to calculate the equilibrium lattice constant and the bulk modulus, and (b) the density of states calculations. The application of these results to the subsequent study of an interface involving the carbosulfide and the host matrix is also illustrated.

Metallographic and Materials Evaluation of a Cracked Radial Steam Turbine Rotor

2018 ◽  
Author(s):  
Vamadevan Gowreesan ◽  
Wayne Greaves
Keyword(s):  
Steam Turbine ◽  
Manganese Sulfide ◽  
Turbine Rotor ◽  
Impact Testing ◽  
Composition Analysis ◽  
Tempered Martensite ◽  
Material Defects ◽  
Fracture Appearance Transition Temperature ◽  
Fracture Appearance ◽  
High Level

A radial steam turbine developed cracks after 220,000 hours of service. The rotor had an integral disc with eight rows of blades, and a short stub. Nine inlets on the disc channeled steam from one side to the other, and then radially outward. Analysis of the fracture surface revealed cracks originating in some of the inlet holes, and propagating by fatigue. No material defects were found at the crack initiation sites. Hardness and microstructure (optical) across the disc were uniform, but chemical composition analysis of the alloy revealed high level of phosphorus and sulfur. In addition, the microstructure consisted of uniformly tempered martensite with manganese sulfide stringers. Although tensile properties were normal, impact testing indicated embrittlement by a shift in Fracture Appearance Transition Temperature (FATT). Metallurgical evidence of embrittlement was also found. It was concluded that service induced cyclic loading in combination with reduced crack resistance caused by embrittlement lead to cracking.

scholarly journals Formation of Manganese Sulfide in Steel

1981 ◽  
Vol 21 (7) ◽  
pp. 477-484 ◽  
Author(s):  
Yoichi ITO ◽  
Noriyuki MASUMITSU ◽  
Kaichi MATSUBARA
Keyword(s):  
Manganese Sulfide

Thermal decomposition study of manganese sulfide (MnS) nanoparticles

2018 ◽  
Author(s):  
Jiten P. Tailor ◽  
Ankurkumar J. Khimani ◽  
Sunil H. Chaki ◽  
M. P. Deshpande
Keyword(s):  
Thermal Decomposition ◽  
Manganese Sulfide

CALPHAD-assisted morphology control of manganese sulfide inclusions in free-cutting steels

2019 ◽  
Vol 779 ◽  
pp. 844-855 ◽  
Author(s):  
Shih-guei Lin ◽  
Hung-hua Yang ◽  
Yen-hao Su ◽  
Ku-ling Chang ◽  
Chih-han Yang ◽  
...  
Keyword(s):  
Manganese Sulfide ◽  
Morphology Control
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