Effects of alloying elements on the post-irradiation microstructure of 9%Cr-2%W low activation martensitic steels

1992 ◽  
Vol 191-194 ◽  
pp. 879-884 ◽  
Author(s):  
A. Kimura ◽  
M. Narui ◽  
H. Kayano
Keyword(s):  
Alloying Elements ◽  
Martensitic Steels ◽  
Post Irradiation

Martensitic Automotive Steel Sheet - Fundamentals and Metallurgical Optimization Strategies

2014 ◽  
Vol 1063 ◽  
pp. 130-142 ◽  
Author(s):  
Hardy Mohrbacher
Keyword(s):  
Steel Sheet ◽  
Hot Stamping ◽  
Sheet Steel ◽  
Boundary Segregation ◽  
Alloying Elements ◽  
Processing Route ◽  
Martensitic Steels ◽  
Austenite Grain Size ◽  
Cold Forming ◽  
Delayed Cracking

Martensitic sheet steel is increasingly being used in advanced car body construction, especially in areas where high crash loads are expected. Using such steels appropriately the weight of individual components can be reduced by up to 20 percent. Martensitic steel sheet is commercially available in the strength range of 1200 to 1900 MPa, either as cold forming or hot stamping grade. Whereas the strength of such martensitic steels is practically only a function of the carbon content, other properties such as ductility, toughness, bendability and delayed cracking resistance are severely influenced by other alloying elements and the particular thermal processing route. The paper discusses the influence of various key-alloying elements such as Nb, Mo and B on these properties and suggests routes to optimize the steel’s behavior with respect to the manufacturing and application related aspects.Keywords Martensite, prior austenite grain size, delayed cracking, grain boundary segregation, hydrogen trapping, niobium, molybdenum

scholarly journals Mapping Multivariate Influence of Alloying Elements on Creep Behavior for Design of New Martensitic Steels

2019 ◽  
Vol 50 (7) ◽  
pp. 3106-3120 ◽  
Author(s):  
Amit K. Verma ◽  
Jeffery A. Hawk ◽  
Laura S. Bruckman ◽  
Roger H. French ◽  
Vyacheslav Romanov ◽  
...  
Keyword(s):  
Creep Behavior ◽  
Alloying Elements ◽  
Martensitic Steels

Effect of Tempering on Bendability and Impact Property of Hot Rolled Low-Carbon Martensitic Steel

2018 ◽  
Vol 941 ◽  
pp. 474-479
Author(s):  
Sung Il Kim ◽  
Seok Jong Seo ◽  
In Shik Suh
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Impact Property ◽  
Alloying Elements ◽  
Bending Test ◽  
Low Carbon ◽  
Martensitic Steels ◽  
Tempering Temperature ◽  
Impact Properties ◽  
The Impact

We examined the effects of tempering process and alloying elements on the microstucture, tensile properties, bendability and impact property of direct quenched (DQ), and re-austenitizing and quenched (RQ) low-carbon martensitic steels. For this purpose, four low carbon martensitic steels (Fe-0.07C-1.8Mn-Cr-Nb-Ti-B) were selected. We have investigated the effects of tempering temperature and alloying elements of chromium (Cr), titanium (Ti) and niobium (Nb) on mechanical properties and microstructures. Mechanical properties and microstructures were analyzed as well using tensile test, V-bending test, charpy V-notched impact test and electron microscopy for DQ, DQ and tempered (DQ-T), RQ and RQ and tempered (RQ-T) low-carbon martensitic steels. It has been found that the as-quenched microstructures of the DQ and RQ specimens were fully martensitic structure. Prior austenite grain size and effective grain size after quenching were larger in the case of RQ steel. In both cases, tempering made the needle-shaped carbides. It is shown that the strength decreased when the tempering temperature increased. The strengths of the DQ and DQ-T steels were 30~50MPa higher than those of the RQ and RQ-T steels. Despite the higher strength of the DQ and DQ-T states, both had similar impact properties with the RQ and RQ-T states. However, the impact properties of the Nb added RQ and RQ-T steels with fine martensite morphology exhibited higher than those of DQ and DQ-T steels.

scholarly journals Effects of Alloying Elements Addition on Delayed Fracture Properties of Ultra High-Strength TRIP-Aided Martensitic Steels

Metals ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 6 ◽  
Author(s):  
Tomohiko Hojo ◽  
Junya Kobayashi ◽  
Koh-ichi Sugimoto ◽  
Akihiko Nagasaka ◽  
Eiji Akiyama
Keyword(s):  
Hydrogen Embrittlement ◽  
Retained Austenite ◽  
Hydrogen Diffusion ◽  
High Strength ◽  
Alloying Elements ◽  
Bending Test ◽  
Hydrogen Trapping ◽  
Martensitic Steels ◽  
Diffusible Hydrogen ◽  
Martensite Matrix

To develop ultra high-strength cold stamping steels for automobile frame parts, the effects of alloying elements on hydrogen embrittlement properties of ultra high-strength low alloy transformation induced plasticity (TRIP)-aided steels with a martensite matrix (TM steels) were investigated using the four-point bending test and conventional strain rate tensile test (CSRT). Hydrogen embrittlement properties of the TM steels were improved by the alloying addition. Particularly, 1.0 mass% chromium added TM steel indicated excellent hydrogen embrittlement resistance. This effect was attributed to (1) the decrease in the diffusible hydrogen concentration at the uniform and fine prior austenite grain and packet, block, and lath boundaries; (2) the suppression of hydrogen trapping at martensite matrix/cementite interfaces owing to the suppression of precipitation of cementite at the coarse martensite lath matrix; and (3) the suppression of the hydrogen diffusion to the crack initiation sites owing to the high stability of retained austenite because of the existence of retained austenite in a large amount of the martensite–austenite constituent (M–A) phase in the TM steels containing 1.0 mass% chromium.

Segregation of Alloying Elements on Small-Angle Grain Boundaries in Ferritic-Martensitic Steels under Ion Irradiation

2020 ◽  
Vol 11 (5) ◽  
pp. 1103-1109
Author(s):  
S. V. Rogozhkin ◽  
N. A. Iskandarov ◽  
A. A. Nikitin ◽  
A. A. Khomich ◽  
V. V. Khoroshilov ◽  
...  
Keyword(s):  
Grain Boundaries ◽  
Small Angle ◽  
Ion Irradiation ◽  
Alloying Elements ◽  
Martensitic Steels ◽  
Segregation Of Alloying Elements

scholarly journals The effect of the addition of alloying elements on carbide precipitation and mechanical properties in 5% chromium martensitic steels

2007 ◽  
Vol 55 (14) ◽  
pp. 4877-4889 ◽  
Author(s):  
P. Michaud ◽  
D. Delagnes ◽  
P. Lamesle ◽  
M.H. Mathon ◽  
C. Levaillant
Keyword(s):  
Mechanical Properties ◽  
Carbide Precipitation ◽  
Alloying Elements ◽  
Martensitic Steels
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