scholarly journals Toughness Property Control by Nb and Mo Additions in High-Strength Quenched and Tempered Boron Steels

Metals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 95
Author(s):  
Irati Zurutuza ◽  
Nerea Isasti ◽  
Eric Detemple ◽  
Volker Schwinn ◽  
Hardy Mohrbacher ◽  
...  
Keyword(s):  
Solid Solution ◽  
Transition Temperature ◽  
High Strength ◽  
Unit Size ◽  
Tempered Martensite ◽  
Size Refinement ◽  
Direct Quenching ◽  
Property Control ◽  
The Impact ◽  
Impact Transition Temperature

The synergetic effect on hardenability by combining boron with other microalloying elements (such as Nb, Mo and Nb + Mo) is widely known for high-strength medium carbon steels produced by direct quenching and subsequent tempering treatment. The improvement of mechanical properties could be reached through optimization of different mechanisms, such as solid solution hardening, unit size refinement, strain hardening, fine precipitation hardening and the effect of carbon in solid solution. The current study proposes a procedure for evaluating the contribution of different microstructural aspects on Charpy impact toughness. First, the effect that austenite conditioning has on low-temperature transformation unit sizes and microstructural homogeneity was analysed for the different microalloying element combinations. A detailed crystallographic characterization of the tempered martensite was carried out using electron backscattered diffraction (EBSD) in order to quantify the effect of unit size refinement and dislocation density. The impact of heterogeneity and presence of carbides was also evaluated. The existing equations for impact transition temperature (ITT50%) predictions were extended from ferrite-pearlite and bainitic microstructures to tempered martensite microstructures. The results show that microstructural refinement is most beneficial to strength and toughness while unit size heterogeneity has a particularly negative effect on ductile-to-brittle transition behaviour. By properly balancing alloy concept and processing, steel having a yield strength above 900 MPa and low impact transition temperature could be obtained by direct quenching and tempering.

Structure and properties of high strength low alloyed cold-resistant steel after reheat and direct quenching with tempering

2020 ◽  
pp. 7-19
Author(s):  
O. V. Sych ◽  
E. I. Khlusova ◽  
E. A. Yashina ◽  
E. V. Svyatysheva ◽  
E. A. Vasilyeva
Keyword(s):  
High Temperature ◽  
High Strength ◽  
Optical Metallography ◽  
Resistant Steel ◽  
Structure And Properties ◽  
Direct Quenching ◽  
The Impact ◽  
Rolled Plates ◽  
Reheat Quenching ◽  
Rolling Heat

The paper shows comparative investigations of structure of rolled plates from low alloyed coldresistant steel 08CrNi2MoCuNb with guaranteed yield strength 750 MPa after traditional reheat quenching and quenching from rolling heat (direct quenching) with subsequent high temperature tempering. The research is carried out by means of optical metallography, SEM and TEM. The peculiarities of parameters of bainitemartensite structure, which influence the strength level in initial (quenched) state, are revealed. Also, the impact of tempering on structure and properties of rolled plates after reheat and direct quenching is shown. 

Effect of Aging Treatment on Structural and Mechanical Properties of CuCrZr/AlN Nanocomposites

2014 ◽  
Vol 548-549 ◽  
pp. 141-146
Author(s):  
Man Gu ◽  
Yu Cheng Wu ◽  
Ming Hua Jiao ◽  
Xin Min Huang
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Copper Alloy ◽  
Brinell Hardness ◽  
Aging Treatment ◽  
High Strength ◽  
Powder Metallurgy Method ◽  
Micro Hardness ◽  
The Impact ◽  
Electronic Microscope

Powder metallurgy method was used to prepare copper alloy nanocomposites (CuCrZr/AlN) with high strength and conductivity. The morphologies and structures of the CuCrZr/AlN nanocomposites were analyzed using scanning electronic microscope (SEM) and transmission electronic microscope (TEM). The impact of aging treatment on mechanical properties of CuCrZr/AlN nanocomposites was studied. The result showed that dislocation density of the sample decreased and the solid solution atoms precipitated after aging treatment. The micro-hardness of the sample decreased and Brinell hardness increased after aging treatment.

scholarly journals Preparation and Characterization of High-Strength Glass-Ceramics via Ion-Exchange Method

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5477
Author(s):  
Jianwei Lu ◽  
Haifeng Wang ◽  
Juanjuan Zhu ◽  
Qiuju Zheng ◽  
Linfeng Ding ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Ion Exchange ◽  
Flexural Strength ◽  
Vickers Hardness ◽  
Glass Ceramics ◽  
High Strength ◽  
Aluminosilicate Glass ◽  
Exchange Method ◽  
The Impact

Lithium aluminosilicate glass-ceramics (LAS GCs) are ideal shell materials for mobile phones; however, the mechanical properties of LAS GCs are comparatively lower than that of other shell materials. In this work, the impact of TiO2/(TiO2 + ZrO2) ratio on properties of LAS GCs was studied and the ion-exchange methods were applied to improve the mechanical properties of LAS GCs. The results show that LAS GCs with TiO2/(TiO2 + ZrO2) = 1/2 exhibit the best flexural strength (109 MPa) and Vickers hardness (525 Kg/mm2). The as-prepared glass was nucleated at 560 °C for 1 h and crystallized at 720 °C for 0.5 h. The main crystalline phases of LAS GCs are β-quartz solid solution, β-spodumene solid solution, and Li2SiO3. Moreover, the flexural strength and Vickers hardness of LAS GCs with TiO2/(TiO2 + ZrO2) = 1/2 further increased to 356 MPa and 838 Kg/mm2 after an ion-exchange at 420 °C for 6 h in pure KNO3 molten salt. The LAS GCs with enhanced mechanical strength have the potential to be applied as mobile phone back panels.

A Comparison of Charpy V-Notch, Dynamic Tear, and Precracked Charpy Impact Transition-Temperature Curves for AAR Grades of Cast Steel

1976 ◽  
Vol 98 (2) ◽  
pp. 446-452
Author(s):  
R. L. Sharkey ◽  
D. H. Stone
Keyword(s):  
Fracture Toughness ◽  
Transition Temperature ◽  
Cast Steel ◽  
Charpy Impact ◽  
High Strength ◽  
Temperature Data ◽  
Transition Temperatures ◽  
Strength Alloy ◽  
Impact Transition Temperature ◽  
Alloy Cast

Impact tests using Charpy V-notch, Dynamic Tear and Precracked Charpy samples were conducted on AAR-B, AAR-C (several compositions and heat treatments), and AAR-E cast grades of steel and on a high-strength, alloy cast steel. Graphical presentations of the transition-temperature data are given. Differences in the relative shapes of the curves and the locations of the NDT temperatures with respect to the transition temperatures are discussed. Fracture toughness, KId, values are also presented.

scholarly journals Analysis of the static and dynamic properties of wear-resistant Hardox 600 steel in the context of its application in working elements

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Ł. Konat ◽  
R. Jasiński ◽  
B. Białobrzeska ◽  
Ł. Szczepański
Keyword(s):  
Transition Temperature ◽  
Impact Energy ◽  
Impact Test ◽  
Dynamic Properties ◽  
Charpy Impact ◽  
High Strength ◽  
Charpy Impact Test ◽  
Material Behavior ◽  
Significant Difference ◽  
The Impact

Abstract The article discusses the static and dynamic properties of high-strength, boron-containing Hardox 600 steel that is resistant to abrasive wear, both in its delivery state and after normalization. Since the available published material in the literature does not have any real mechanical indicators of the abovementioned steel, a static tension test was carried out at an ambient temperature. The steel’s tensile strength, yield strength, Young’s modulus, elongation and reduction of area were determined from the test. The Charpy impact test at temperatures of −40 °C, −20 °C, 0 °C, and +20 °C and fractographic analysis were performed to determine the transition temperature of ductility to brittleness. In dynamic load conditions, the assigned values of impact energy do not always truly determine the material behavior. Thus, the aim of the fractography was to provide precision when determining the behavior. A significant difference in the impact energy of the tested steel with respect to its heat treatment and ductile-brittle transition temperature was observed and determined based on the impact test result, as well as the nature of the fracture. On the basis of the determined structural and strength characteristics, an analysis of the possibility of application of Hardox 600 steel on selected elements of working machines was performed.

CARLSON ALLOY C600 and C600 ESR

Alloy Digest ◽  
1994 ◽  
Vol 43 (11) ◽  
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Fracture Toughness ◽  
Cold Working ◽  
Elevated Temperatures ◽  
High Strength ◽  
Heat Treating ◽  
Solid Solution Alloy ◽  
Resistance To Oxidation ◽  
Good Workability

Abstract CARLSON ALLOYS C600 AND C600 ESR have excellent mechanical properties from sub-zero to elevated temperatures with excellent resistance to oxidation at high temperatures. It is a solid-solution alloy that can be hardened only by cold working. High strength at temperature is combined with good workability. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as forming, heat treating, and machining. Filing Code: Ni-470. Producer or source: G.O. Carlson Inc.

CRUCIBLE 422

Alloy Digest ◽  
2007 ◽  
Vol 56 (12) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Aerospace Industry ◽  
High Strength ◽  
Heat Treating ◽  
Tempered Martensite ◽  
Temperature Performance

Abstract Crucible 422 has a structure of tempered martensite to give the alloy high strength. It is useful in the aerospace industry for structurals with high strength/weight ratios. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as fracture toughness. It also includes information on low and high temperature performance, and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SS-1004. Producer or source: Crucible Service Centers.

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