scholarly journals The Effect of Hot Working on the Mechanical Properties of High Strength Biomedical Ti-Nb-Ta-Zr-O Alloy

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4233 ◽  
Author(s):  
Dalibor Preisler ◽  
Miloš Janeček ◽  
Petr Harcuba ◽  
Jan Džugan ◽  
Kristýna Halmešová ◽  
...  
Keyword(s):  
Grain Size ◽  
Tensile Properties ◽  
Hot Working ◽  
Fatigue Performance ◽  
High Yield ◽  
Chemical Inhomogeneity ◽  
Cast Material ◽  
Hip Joint Replacement ◽  
Area Reduction ◽  
Hot Rolled

Beta titanium alloy Ti-35Nb-6Ta-7Zr-0.7O (wt%) was developed as a material intended for the manufacturing of a stem of a hip joint replacement. This alloy contains only biocompatible elements and possesses a very high yield strength already in the cast condition (900 MPa). However, the porosity, large grain size and chemical inhomogeneity reduce the fatigue performance below the limits required for utilization in the desired application. Two methods of hot working, die forging and hot rolling, were used for processing of this alloy. Microstructural evolution, tensile properties and fatigue performance of the hot worked material were investigated and compared to the cast material. Microstructural observations revealed that porosity is removed in all hot-worked conditions and the grain size is significantly reduced when the area reduction exceeds 70%. Static tensile properties were improved by both processing methods and ultimate tensile strength (UTS) of 1200 MPa was achieved. Fatigue results were more reproducible in the hot rolled material due to better microstructural homogeneity, but forging leads to an improved fatigue performance. Fatigue limit of 400 MPa was achieved in the die-forged condition after 70% of area reduction and in the hot rolled condition after 86% of area reduction.

Microstructure and Tensile Properties of Hot Worked High Nb Containing TiAl Alloy on Industrial Scale

2005 ◽  
Vol 475-479 ◽  
pp. 785-788
Author(s):  
Jun Pin Lin ◽  
Xiang Jun Xu ◽  
Jian Feng Gao ◽  
Yan Li Wang ◽  
Zhi Lin ◽  
...  
Keyword(s):  
Grain Size ◽  
Tensile Properties ◽  
High Temperatures ◽  
Tial Alloy ◽  
Hot Working ◽  
Industrial Scale ◽  
Initial Microstructure ◽  
Similar Composition ◽  
Fine Grain ◽  
Good Workability

. A hot working and its effect on the microstructure and tensile properties of Ti-45Al-9 (Nb, W, B, Y) alloy ingot on industrial scale were investigated. The results showed that the alloy has good workability in anα+γphase region. An ingot on industrial scale was successfully extruded followed by multi-step canned forging. The initial microstructure of the alloy is fine full lamellar (FL) microstructure. After hot working a sound pancake exhibiting a fine grain duplex (DP) microstructure with grain size about 20μm was obtained. The as-forged alloy has more balanced tensile properties than the small heats with similar composition and microstructure at both room and high temperatures.

Study on Cooling Process of Hot Rolled Wire Rod with Dual Phase Microstructure

2011 ◽  
Vol 415-417 ◽  
pp. 779-783
Author(s):  
Xiang Jun Xu ◽  
Jun Qi Kong
Keyword(s):  
Grain Size ◽  
Tensile Properties ◽  
Volume Fraction ◽  
Steel Wire ◽  
Strength Level ◽  
Dual Phase ◽  
Cooling Process ◽  
Wire Rod ◽  
Hot Rolled ◽  
Rolled Wire

In the present paper effect of post deformation cooling rates on microstructure of ER70S-6 steel was investigated by using Gleeble1500 simulator. From the results, a controlling cooling process for obtaining dual phase (DP) microstructure was designed to produce hot rolled wire rod with a diameter of 6.5mm in a continuous no-twist and high-speed wire rolling mill, and the microstructures and the tensile properties of the wire rod were analyzed. The results showed that ER70S-6 steel deformed at 845°C and cooled at a rate of faster than 10°C/s had a DP microstructure with grain size of less than 8.3μm and martensitic volume fraction of 9-11%. The hot rolled wire rod cooled by blowing air had a DP microstructure with a grain size of 8.2μm and martensitic volume fraction of 11.5%. The present wire rod was superior to that of the same steel with ferrite plus pearlite microstructure in tensile properties, with yield strength level of 335-345MPa, ultimate tensile strength level of 600-620MPa, plastic elongation of 26.5-31.5% and strain hardening exponent of 0.221, respectively. ER70S-6 steel wire rod with DP microstructure showed promise of meeting the requirements for grade 8.8 fastener.,In the present paper steel wire rod with DP microstructure showed promise of meeting the requirements for grade 8.8 fastener.

Effect of Hot Band Annealing on the Microstructure and Mechanical Properties of Low Carbon Electrical Steels

2010 ◽  
Vol 1276 ◽  
Author(s):  
E. Gutiérrez-Castañeda ◽  
A. Salinas-Rodríguez
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Magnetic Properties ◽  
Tensile Properties ◽  
Electrical Steel ◽  
Processing Route ◽  
Rolled Strip ◽  
Final Annealing ◽  
Electrical Steels ◽  
Hot Rolled

AbstractMagnetic properties of grain non-oriented low-C electrical steels are improved when the hot rolled strip is annealed (HBA) prior to cold rolling and final annealing treatments. This improvement results from development of a {100}<uvw> texture in the large grained ferrite microstructure produced during final annealing. HBA at 800–850 °C results in rapid decarburization and elimination of carbide particles which have caused concerns about the suitability of the mechanical properties in the final product. In this work, samples taken from a hot rolled electrical steel coil are subjected to HBA during 150 minutes at 850 °C, cold rolled and finally annealed three minutes at temperatures between 700 and 1000 °C. The resulting tensile properties are compared with those of samples subjected to a similar processing route but without the HBA treatment and samples of industrially semi-processed grain non-oriented electrical steel decarburized 16 hours at 750 °C. It is shown that the yield strength of samples with and without HBA depends on the final grain size according to the Hall-Petch relationship; the final grain size depends strongly on annealing temperature. However, the HBA treatment causes the strength to decrease by a factor of about 2.5 and the ductility to increase by a factor of about 1.5. It is observed that the microstructure and tensile properties of the semi-processed electrical steel subjected to a final decarburization annealing are identical to those observed in material subjected to HBA in the present work. These results indicate that the HBA treatment not only improves the magnetic properties but also leads to a significant reduction of production time for grain non-oriented electrical steels.

MICROCAST-X MAR-M-247

Alloy Digest ◽  
1995 ◽  
Vol 44 (5) ◽  
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Tensile Properties ◽  
Negative Impact ◽  
Rupture Properties

Abstract The Microcast-X process produces a substantially finer grain size that improves mechanical properties in MAR-M-247 with modest negative impact on rupture properties above 1600 F (871 C). This datasheet provides information on composition, microstructureand tensile properties as well as creep and fatigue. It also includes information on casting. Filing Code: Ni-481. Producer or source: Howmet Corporation.

HAYNES ALLOY No. 625SQ

Alloy Digest ◽  
2003 ◽  
Vol 52 (8) ◽  
Keyword(s):  
Grain Size ◽  
High Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Fatigue Resistance ◽  
Heat Treating ◽  
Temperature Performance ◽  
Haynes Alloy

Abstract Haynes 625SQ alloy is a modification of Haynes 625 alloy (see Alloy Digest Ni-354, January 1988) with tighter controls on chemistry and a finer grain size for fatigue resistance up to 680 deg C (1250 deg F). This datasheet provides information on composition, physical properties, microstructure, elasticity, and tensile properties as well as fatigue. It also includes information on high temperature performance as well as heat treating. Filing Code: Ni-612. Producer or source: Haynes International Inc.

TENFORM XF450

Alloy Digest ◽  
2007 ◽  
Vol 56 (1) ◽  
Keyword(s):  
Physical Properties ◽  
Tensile Properties ◽  
Alloy Steel ◽  
High Strength ◽  
Bend Strength ◽  
Low Alloy Steel ◽  
Hot Rolled

Abstract The high strength of Tenform XF450, a hot-rolled high-strength low-alloy steel, allows the user to increase the strength of a finished component or to reduce the thickness. The steel is used in the construction and the automotive industries. This datasheet provides information on composition, physical properties, tensile properties. and bend strength. It also includes information on forming. Filing Code: CS-148. Producer or source: Hille & Mueller, USA Inc. See also Alloy Digest CS-173, November 2012.

DOGAL H 700 LAD

Alloy Digest ◽  
2015 ◽  
Vol 64 (3) ◽  
Keyword(s):  
Yield Strength ◽  
Physical Properties ◽  
Tensile Properties ◽  
Rolled Steel ◽  
Bend Strength ◽  
Hot Rolled ◽  
Hot Rolled Steel ◽  
Minimum Yield

Abstract Dogal H 700 LAD is a galvanized hot rolled steel that is microalloyed and can be cold formed. The 700 signifies the minimum yield strength. This datasheet provides information on composition, physical properties, tensile properties. and bend strength. It also includes information on forming. Filing Code: CS-184. Producer or source: SSAB Swedish Steel Inc..

STRENX 960MC

Alloy Digest ◽  
2016 ◽  
Vol 65 (11) ◽  
Keyword(s):  
Yield Strength ◽  
Physical Properties ◽  
Structural Steel ◽  
Tensile Properties ◽  
Bend Strength ◽  
Cold Forming ◽  
Hot Rolled ◽  
Minimum Yield

Abstract Strenx 960MC is a hot-rolled structural steel made for cold forming, with minimum yield strength of 960 MPa (139 ksi) for stronger and lighter structures. This alloy meets or exceeds the requirements of S960MC in EN 10149-2. This datasheet provides information on composition, physical properties, tensile properties, and bend strength. It also includes information on surface qualities as well as forming, machining, and joining. Filing Code: SA-772. Producer or source: SSAB Swedish Steel Inc..

DILLIDUR 450V

Alloy Digest ◽  
2011 ◽  
Vol 60 (12) ◽  
Keyword(s):  
Fracture Toughness ◽  
Wear Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Room Temperature ◽  
Surface Hardness ◽  
Heat Treating ◽  
Hot Working ◽  
Resistant Steel ◽  
Bend Strength

Abstract Dillidur 450V is a water hardened wear-resistant steel with surface hardness at room temperature of 420-480 HB. The steel is easy to weld and bend. Hot working is not recommended. This datasheet provides information on composition, physical properties, hardness, tensile properties, and bend strength as well as fracture toughness. It also includes information on wear resistance as well as forming, heat treating, machining, and joining. Filing Code: SA-638. Producer or source: Dillinger Hütte GTS.

SUPRALSIM 690

Alloy Digest ◽  
2011 ◽  
Vol 60 (11) ◽  
Keyword(s):  
Fracture Toughness ◽  
Yield Strength ◽  
Tensile Properties ◽  
High Yield ◽  
Bend Strength ◽  
High Yield Strength ◽  
Weight Saving

Abstract Supralsim 690 is high yield strength steel for welded and weight-saving structures. This datasheet provides information on composition, tensile properties, and bend strength as well as fracture toughness. It also includes information on forming and joining. Filing Code: SA-637. Producer or source: Industeel USA, LLC.

Sign in / Sign up

Export Citation Format

Share Document