THE MECHANICAL PROPERTIES OF TANTALUM WITH SPECIAL REFERENCE TO THE DUCTILE-BRITTLE TRANSITION

1961 ◽  
Author(s):  
M. A. ADAMS ◽  
A. IANNUCCI
Keyword(s):  
Mechanical Properties ◽  
Special Reference ◽  
Brittle Transition

Static and Cyclic Behavior of Welded DH36 Steel and Its Application at Low Temperatures

2021 ◽  
pp. 1-31
Author(s):  
Weidong Zhao ◽  
Guoqing Feng ◽  
Bernt J. Leira ◽  
Huilong Ren
Keyword(s):  
Mechanical Properties ◽  
Low Temperatures ◽  
Fatigue Tests ◽  
Cyclic Behavior ◽  
Brittle Transition ◽  
Ductile To Brittle Transition

Abstract The mechanical properties of welded DH36 steel at low temperatures are important to the safety of structures in Polar areas. The purpose of the study is to investigate the static and cyclic behavior of welded DH36 steel at low temperatures based on tensile and fatigue tests. The Ductile to Brittle transition and Fatigue Ductile to Brittle Transition of welded DH36 steel occurred at low temperatures. Finally, some relevant applications of the results within the context of polar engineering and design are discussed in the last part of the present study.

The Effect of Oxygen, Nitrogen, and Hydrogen on the Mechanical Properties of Cb-752

1974 ◽  
Vol 96 (3) ◽  
pp. 201-206 ◽  
Author(s):  
M. W. Mahoney ◽  
N. E. Paton
Keyword(s):  
Mechanical Properties ◽  
Grain Boundaries ◽  
Tensile Properties ◽  
Uniform Distribution ◽  
Base Alloy ◽  
Uniaxial Tensile ◽  
Hardness Testing ◽  
Strength Parameters ◽  
Brittle Transition ◽  
Effect Of Oxygen

Uniaxial tensile properties of the niobium-base alloy Cb-752 have been determined as a function of oxygen, nitrogen, and hydrogen content over a temperature range of −196 C to 200 deg C. Each of these impurities increased the temperature at which a ductile-brittle transition occurs. Although ductility was severely reduced, strength parameters were relatively unchanged making detection of embrittlement by hardness testing difficult. Impurity levels for embrittlement were sufficiently low and the affinity of Cb-752 for contamination sufficiently great that processing operations require strict control. The mechanism of this impurity embrittlement is not well understood. However, observations of fracture surfaces of brittle failures reveal mixed intergranular cleavage with a uniform distribution of precipitates throughout grain boundaries. These observations are discussed in the light of current theories.

scholarly journals Chemical reactions during sintering of Fe-Cr-Mn-Si-Ni-Mo-C-steels with special reference to processing in semi-closed containers

2015 ◽  
Vol 47 (1) ◽  
pp. 61-69 ◽  
Author(s):  
A. Cias
Keyword(s):  
Mechanical Properties ◽  
Carbon Monoxide ◽  
Special Reference ◽  
Water Vapour ◽  
Chemical Reactions ◽  
Thermodynamic Data ◽  
Alloying Elements ◽  
Bearing Steels ◽  
Kinetics Of

Sintering of Cr, Mn and Si bearing steels has recently attracted both experimental and theoretical attention and processing in semiclosed containers has been reproposed. This paper brings together relevant thermodynamic data and considers the kinetics of some relevant chemical reactions. These involve iron and carbon, water vapour, carbon monoxide and dioxide, hydrogen and nitrogen of the sintering atmospheres and the alloying elements Cr, Mn, Mo and Si. The paper concludes by presenting mechanical properties data for three steels sintered in local microatmosphere with nitrogen, hydrogen, nitrogen-5% hydrogen and air as the furnace gas.

scholarly journals Investigation of the Mechanical Properties of St. Lawrence River Ice

1971 ◽  
Vol 8 (2) ◽  
pp. 163-169 ◽  
Author(s):  
L. W. Gold ◽  
A. S. Krausz
Keyword(s):  
Mechanical Properties ◽  
Strain Rate ◽  
Yield Stress ◽  
Power Law ◽  
River Ice ◽  
Stress Strain ◽  
Strain Behavior ◽  
Brittle Transition ◽  
Ductile To Brittle Transition ◽  
St Lawrence River

Observations are reported on the stress–strain behavior at −9.5 ± 0.5 °C of four types of ice obtained from the St. Lawrence River. The ice was subject to nominal rates of strain covering the range 2.1 × 10−5 min−1 to 5.8 × 10−2 min−1. A ductile-to-brittle transition was observed for strain rate of about 10−2 min−1. In the ductile range the four types had an upper yield stress that increased with strain rate according to a power law.

Elastomer Blends

2002 ◽  
Vol 75 (3) ◽  
pp. 365-427 ◽  
Author(s):  
Duryodhan Mangaraj
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Special Reference ◽  
Transport Properties ◽  
Commercial Application ◽  
Solution Properties ◽  
Polymer Miscibility ◽  
Mechanical Methods

Abstract Blending of elastomers is often used to enhance he performance characteristics of rubber products. This article reviews the thermodynamic principles underlying polymer-polymer miscibility, with special reference to elastomer blends. It discusses the distribution of fillers, additives and curatives in different phases of the blend and its effect on the properties of the vulcanizate. It describes the different methods used in preparing elastomer blends, with special emphasis on compatibilization. Characterization of blends using optical and electron microscopy, solution properties, thermal and dynamic mechanical methods have been described along with results. The effect of blending on mechanical properties, hysteresis, adhesion and tack, transport properties and electrical conductivity has been discussed. Past attempts for property enhancement by blending elastomers have been reviewed, followed by a discussion of commercial application of elastomer blends.

Ternary MoSi2 Compounds for High Temperature Structural Applications

1993 ◽  
Vol 322 ◽  
Author(s):  
S. Chin ◽  
D. L. Anton ◽  
A. F. Giamei
Keyword(s):  
Crystal Structure ◽  
Mechanical Properties ◽  
Isothermal Oxidation ◽  
Phase Boundaries ◽  
Brittle Transition ◽  
Flexural Testing ◽  
Structural Applications ◽  
Brittle Transition Temperature ◽  
Ductile To Brittle Transition ◽  
Oxidation Testing

AbstractThe microstructure and phase composition of MoSi2 modified with Al, B, Ge, Hf, Nb, and Re have been investigated. B and Hf substitutions for Si and Mo, respectively, exhibited very low solubilities in MoSi2. Al and Nb substitutions for Si and Mo, respectively, changed the crystal structure from tetragonal C11b to hexagonal C40. Phase boundaries and solubility limits were determined for Al and Nb substitutions. Ge and Re substitutions for Si and Mo, respectively, exhibited complete solubility and maintained the tetragonal Cllb crystal structure. The mechanical properties evaluation as determined by four-point flexural testing indicate a ductile-to-brittle transition temperature (DBTT) of 1250-1350°C for all of the modifications evaluated. Isothermal oxidation testing at 1400°C indicates no significant debit in oxidation resistance of MoSi2 that can be attributed to alloying, however, alloys containing higher concentrations of the ternary elements may exhibit reduced oxidation resistances.

scholarly journals Roles of silica and lignin in horsetail (Equisetum hyemale), with special reference to mechanical properties

2012 ◽  
Vol 111 (4) ◽  
pp. 044703 ◽  
Author(s):  
Shigeru Yamanaka ◽  
Kanna Sato ◽  
Fuyu Ito ◽  
Satoshi Komatsubara ◽  
Hiroshi Ohata ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Special Reference ◽  
Equisetum Hyemale

The Repair of Worn or Over-machined Parts by Electrodeposition

1945 ◽  
Vol 152 (1) ◽  
pp. 8-28 ◽  
Author(s):  
A. W. Hothersall
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Fatigue Strength ◽  
Special Reference ◽  
Nickel Coatings ◽  
Electrodeposited Coatings ◽  
Machined Parts ◽  
Electrodeposition Of Nickel

Worn or over-machined parts may be restored to size by electrodeposition of nickel or chromium followed by machining or grinding to remove excess of deposit. The mechanical properties and the adhesion of these deposits are described with special reference to nickel. It is shown that strongly adherent nickel coatings can contribute appreciably to the tensile strength of the steel upon which they are deposited. Electrodeposited coatings may reduce the fatigue strength of steel and their use on parts subject to high alternating stresses should be made with caution. General notes on the process are given for the guidance of users.

Sign in / Sign up

Export Citation Format

Share Document