scholarly journals High strength welds in Titanium & Nickel based alloys by impact welding- A practical method

2021 ◽  
pp. 100056
Author(s):  
Bhuvi S.L. Nirudhoddi ◽  
K. Sajun Prasad ◽  
Anupam Vivek ◽  
Glenn S. Daehn
Keyword(s):  
High Strength ◽  
Practical Method ◽  
Titanium Nickel ◽  
Impact Welding

Cryogenic Temperature Dependence of the Yield Strength of High-Strength Alloys

1966 ◽  
Vol 88 (1) ◽  
pp. 117-128 ◽  
Author(s):  
C. T. Yang
Keyword(s):  
Yield Strength ◽  
Stainless Steels ◽  
General Equation ◽  
Cryogenic Temperature ◽  
Elevated Temperatures ◽  
High Strength ◽  
Cryogenic Temperatures ◽  
Test Range ◽  
Titanium Nickel ◽  
Straight Lines

The effect of cryogenic temperatures (from 78 F to −423 F) on the yield strength of twenty alloys was studied. Experimental results prove that they do not conform to any of the following theories: Hollomon and Zener’s, Cottrell and Bilby’s, or Fisher’s. However, all the plottings in loge-loge scale of yield strength versus absolute cryogenic temperatures of these alloys fall on straight lines which are governed by one single general equation, σy = bT−m. From the Cottrell’s dislocation theory on yielding and Fisher’s equation of activation energy in forming a dislocation loop, the same type of equation of yield strength versus temperature as expressed by the empirical ones can be derived theoretically. The empirical equations are very useful in predicting yield strengths at any cryogenic temperature within or slightly out of the test range for which data were available. Some limited yield strength data at elevated temperatures for a few alloys were studied for comparison. It was observed the general equation for yield strength versus cryogenic temperatures holds valid for stainless steels but not so well for titanium, nickel, and aluminum alloys at elevated temperatures. However, no conclusion can be drawn until further detailed studies at elevated temperatures are made.

High strength impact welding of NiTi and stainless steel wires

2020 ◽  
Vol 29 (10) ◽  
pp. 105023 ◽  
Author(s):  
Jianxiong Li ◽  
Boyd Panton ◽  
Yu Mao ◽  
Anupam Vivek ◽  
Glenn Daehn
Keyword(s):  
Stainless Steel ◽  
High Strength ◽  
Steel Wires ◽  
Impact Welding

Impact welding of ultra-high-strength stainless steel in wrought vs. additively manufactured forms

2019 ◽  
Vol 104 (9-12) ◽  
pp. 4593-4604
Author(s):  
Bert C. Liu ◽  
Anthony Palazotto ◽  
Anupam Vivek ◽  
Glenn S. Daehn
Keyword(s):  
Stainless Steel ◽  
High Strength ◽  
Impact Welding

scholarly journals PRACTICAL METHOD OF FLEXURAL STRENGTH CALCULATION OF REINFORCED AND PRESTRESSED CONCRETE MEMBERS

2007 ◽  
Vol 13 (4) ◽  
pp. 314-322
Author(s):  
Vello Otsmaa ◽  
Tiit Pedak
Keyword(s):  
Flexural Strength ◽  
Cross Sections ◽  
Prestressed Concrete ◽  
Material Properties ◽  
High Strength ◽  
Practical Method ◽  
Strength Analysis ◽  
Compression Zone ◽  
Concrete Members ◽  
Eurocode 2

In this paper the flexural strength analysis of reinforced and prestressed concrete members with symmetrical cross‐sections loaded in the plane of symmetry is performed. A new practical method for determining the height of the compression zone is proposed. The method is valid for normal and high‐strength concretes and for different distributions of bars along the section. It is based on the assumptions, simplifications and material properties of Eurocode 2. Design equations have been developed for the rectangular stress distribution in the concrete compression zone and for the steel stress‐strain diagrams with a horizontal and inclined top branch. A numerical example is presented to show the method usage.

scholarly journals EFFECT OF TREATMENT SOLUTION ON THE MICROSTRUCTURE AND MICROHARDNESS OF TERNARY Ni-Al-Nb ALLOY DOPED WITH TITANIUM

2021 ◽  
Vol 22 (1) ◽  
pp. 1
Author(s):  
Hikmat Nugraha ◽  
Pradoto Ambardi ◽  
Djoko Hadi Prajitno
Keyword(s):  
Solution Treatment ◽  
High Strength ◽  
Optical Microscope ◽  
Titanium Content ◽  
Air Cooling ◽  
Gamma Prime ◽  
Titanium Nickel ◽  
Effect Of Treatment ◽  
Hardness Values

EFFECT OF TREATMENT SOLUTION ON THE MICROSTRUCTURE AND MICROHARDNES OF TERNARY Ni-Al-Nb ALLOY DOPED WITH TITANIUM. Nickel-based superalloys have been widely used in various applications, which require high strength at high temperatures. Most types of these superalloys is age-hardenable because they have γ’ particles' chemical composition Ni3(Al, Ti) in γ’-phase matrix. This research will be used alloy Ni-Al-Nb added alloying elements Ti. This research was conducted to study the mechanical properties, microstructure conditions in some alloys Ni-Al-Nb added distinction Titanium element (0,5% and 1% Ti) using the method of aging temperature variation performed at a temperature of 650 °C,700 °C and 750 °C with a holding time 4 hours and air cooling. Tests were conducted to determine the characterization of the specimen includes testing metallographic optical microscope, Rockwell hardness C and SEM- EDS,XRD. Results obtained from this research that addition of titanium element affecting the hardness values as well as the results of the cast, solution treatment and aging process results. The 1% Titanium content can affect the gamma prime coarsening and make the grain on the microstructure result smooth.

scholarly journals Ultimate Compressive Strength of Steel Stiffened-Plate Structures Triggered by Brittle Fracture under Cryogenic Conditions

2021 ◽  
Author(s):  
Dong Hun Lee ◽  
Jeom Kee Paik ◽  
Jonas W. Ringsberg ◽  
P.J. Tan
Keyword(s):  
Compressive Strength ◽  
Brittle Fracture ◽  
Computational Models ◽  
High Strength ◽  
Material Model ◽  
Practical Method ◽  
Ultimate Compressive Strength ◽  
Stiffened Plate ◽  
Plate Structures ◽  
Cryogenic Conditions

This chapter presents a practical method to investigate the effects of brittle fracture on the ultimate compressive strength of steel stiffened-plate structures under cryogenic conditions. Computational models are developed to analyse the ultimate compressive strength of steel stiffened-plate structures, triggered by brittle fracture, under cryogenic condition. A phenomenological form of the material model for the high-strength steel at cryogenic condition is proposed, that takes into account the Bauschinger effect, and implemented into a nonlinear finite element solver (LS-DYNA). Comparison between computational predictions and experimental measurements is made for the ultimate compressive strength response of a full-scale steel stiffened-plate structure, showing a good agreement between them.

scholarly journals Microstructure-Property Relationships in Cold Rollable, High-Strength α/β Alloys

2020 ◽  
Vol 321 ◽  
pp. 13007
Author(s):  
John W. Foltz
Keyword(s):  
Surface Finish ◽  
Room Temperature ◽  
High Strength ◽  
Pilot Scale ◽  
Pack Rolling ◽  
Nickel Cobalt ◽  
Beta Titanium ◽  
Titanium Nickel ◽  
Annual Capacity ◽  
Hot Pack

For decades Ti-6Al-4V has been the workhorse alloy for aerospace sheet applications due to its good balance of properties and the known ability to hot roll it with relative ease. Sheet of Ti-6Al-4V is made by hot pack rolling, which is a costly and time consuming process, due to the alloy having insufficient room-temperature workability to support significant cold reduction or forming. Consequentially, Ti-6Al-4V is not typically offered in foil gauges, since the direct product of hot pack rolling contains an undesirable surface finish and insufficient gauge control. Hot pack rolling also limits the maximum sheet size and annual capacity. As a world leader in advanced sheet alloys of titanium, nickel, cobalt, and specialty stainless steels, ATI is developing new titanium alloys with improved strength compared to Ti-6Al-4V that take advantage of a recent understanding of cold workability in high-strength alpha-beta titanium. These α+β alloys exceed Ti-6Al-4V strength while being highly cold formable. Cold rolling via coil processing also enables longer lengths of sheet with significantly improved gauge control and surface finish. Results from pilot scale ingots will be presented upon, including final properties of these unique alloys and microstructure-property correlations developed through modelling.

Decomposition of the metastable beta titanium alloy Ti-15-3

1983 ◽  
Vol 41 ◽  
pp. 264-265
Author(s):  
Y. L. Chen ◽  
S. Fujlshiro
Keyword(s):  
Low Cost ◽  
High Strength ◽  
Alpha Phase ◽  
Thick Sheet ◽  
Omega Phase ◽  
Beta Titanium Alloy ◽  
Beta Titanium ◽  
Beta Matrix ◽  
Metastable Beta ◽  
Very High

Metastable beta titanium alloys have been known to have numerous advantages such as cold formability, high strength, good fracture resistance, deep hardenability, and cost effectiveness. Very high strength is obtainable by precipitation of the hexagonal alpha phase in a bcc beta matrix in these alloys. Precipitation hardening in the metastable beta alloys may also result from the formation of transition phases such as omega phase. Ti-15-3 (Ti-15V- 3Cr-3Al-3Sn) has been developed recently by TIMET and USAF for low cost sheet metal applications. The purpose of the present study was to examine the aging characteristics in this alloy.The composition of the as-received material is: 14.7 V, 3.14 Cr, 3.05 Al, 2.26 Sn, and 0.145 Fe. The beta transus temperature as determined by optical metallographic method was about 770°C. Specimen coupons were prepared from a mill-annealed 1.2 mm thick sheet, and solution treated at 827°C for 2 hr in argon, then water quenched. Aging was also done in argon at temperatures ranging from 316 to 616°C for various times.

Effects of cooling rate on the mechanical properties of dual phase treated vanadium steels

1983 ◽  
Vol 41 ◽  
pp. 220-221
Author(s):  
L.J. Chen ◽  
H.C. Cheng ◽  
J.R. Gong ◽  
J.G. Yang
Keyword(s):  
Mechanical Properties ◽  
Cooling Rate ◽  
Automobile Industry ◽  
High Strength ◽  
Weight Percent ◽  
Low Alloy Steels ◽  
Dual Phase ◽  
Resource Requirement ◽  
Alloy Steels ◽  
Potential Weight

For fuel savings as well as energy and resource requirement, high strength low alloy steels (HSLA) are of particular interest to automobile industry because of the potential weight reduction which can be achieved by using thinner section of these steels to carry the same load and thus to improve the fuel mileage. Dual phase treatment has been utilized to obtain superior strength and ductility combinations compared to the HSLA of identical composition. Recently, cooling rate following heat treatment was found to be important to the tensile properties of the dual phase steels. In this paper, we report the results of the investigation of cooling rate on the microstructures and mechanical properties of several vanadium HSLA steels.The steels with composition (in weight percent) listed below were supplied by China Steel Corporation: 1. low V steel (0.11C, 0.65Si, 1.63Mn, 0.015P, 0.008S, 0.084Aℓ, 0.004V), 2. 0.059V steel (0.13C, 0.62S1, 1.59Mn, 0.012P, 0.008S, 0.065Aℓ, 0.059V), 3. 0.10V steel (0.11C, 0.58Si, 1.58Mn, 0.017P, 0.008S, 0.068Aℓ, 0.10V).

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