Influence of Various Precipitate Phases on Tensile Properties of an Extruded Mg-Y-Nd Alloy

2014 ◽  
Vol 788 ◽  
pp. 17-22 ◽  
Author(s):  
Bo Song ◽  
Ren Long Xin ◽  
Gang Chen ◽  
Ke Zeng ◽  
Guang Jie Huang ◽  
...  
Keyword(s):  
Yield Strength ◽  
Strain Hardening ◽  
Tensile Properties ◽  
Precipitation Hardening ◽  
High Strength ◽  
Age Hardening ◽  
Hardening Behavior ◽  
Initial Stage ◽  
Strain Hardening Behavior ◽  
Strain Hardening Rate

The high strength of Mg-Y-Nd alloy has been achieved primarily by precipitation hardening. Therefore, it is important to investigate the influence of various precipitate phases on the tensile properties of Mg-Y-Nd alloys. In this study, an extruded Mg-Y-Nd alloy was aged at various temperatures to examine the hardening behaviors. The results showed that the as-extruded alloy exhibited remarkable age hardening response at 210°C due to the precipitation of β’, and slight hardening response at 150°C and 280°C due to the precipitation of β’’ and β, respectively. Furthermore, different precipitates exerted different effects on the tensile properties. In comparison with the as-extruded alloy, the yield strength of the alloys aged at 210 °C and 150 °C was increased by 21 MPa and 8 MPa, respectively, whereas the yield strength of the alloy aged at 280°C was decreased by 30 MPa. The elongation of the alloy aged at 210°C and 150°C was also largely reduced by 3.4% and 2.9%, respectively, while the elongation of the alloy aged at 280°C was only slightly reduced (6.3%). Moreover, compared with the as-extruded alloy, the alloy aged at 210°C and 150°C exhibited lower hardening capacity and higher strain hardening rate at the initial stage, but the strain hardening rate decreased more quickly with the increasing stress. The alloy aged at 280°C exhibited similar strain hardening behavior with the as-extruded alloy. The results in this study provide guidelines for determining the heat treatment parameters for the Mg-Y-Nd alloys to improve their tensile properties.

Strain Hardening Behavior Prediction Model For Automotive High Strength Multiphase Steels

2015 ◽  
Vol 86 (12) ◽  
pp. 1574-1582 ◽  
Author(s):  
Antonella Dimatteo ◽  
Valentina Colla ◽  
Gianfranco Lovicu ◽  
Renzo Valentini
Keyword(s):  
Prediction Model ◽  
Strain Hardening ◽  
High Strength ◽  
Behavior Prediction ◽  
Hardening Behavior ◽  
Strain Hardening Behavior ◽  
Multiphase Steels

Considerations of Linepipe and Girth Weld Tensile Properties for Strain-Based Design of Pipelines

2010 ◽  
Author(s):  
Yong-Yi Wang ◽  
Ming Liu ◽  
James Gianetto ◽  
Bill Tyson
Keyword(s):  
Yield Strength ◽  
Strain Hardening ◽  
Tensile Properties ◽  
Strain Aging ◽  
High Strength ◽  
Slope Instability ◽  
Practical Implementation ◽  
Aging Effects ◽  
Contributing Factors ◽  
Longitudinal Strains

Pipelines in certain regions are expected to survive high longitudinal strains induced by seismic activities, slope instability, frost heave, and mine subsidence. Material properties, of both pipes and girth welds, are critical contributing factors to a pipeline’s strain capacity. These factors are examined in this paper with particular focus on the modern high strength pipes (grade X70 and above) usually made from microalloyed control-rolled TMCP steels. The examination of the tensile properties of pipes includes some of the most basic parameters such as yield strength, strength variation within a pipe, and newly emerging issues of strength and strain hardening dependence on temperature. The girth weld tensile properties, particularly yield strength, are shown to be dependent on the location of the test specimen. There are strong indications from the tested welds that strain hardening of the welds is dependent on test temperature. The effects of strain aging on pipe and girth weld properties are reviewed. This line of reasoning is extended to possible strain aging effects during field construction, although experimental evidence is lacking at this moment. The paper concludes with considerations of practical implementation of the findings presented in the early part of the paper. Recommendations are made to effectively deal with some of the challenging issues related to the specification and measurement of tensile properties for strain-based design.

MHZ 420

Alloy Digest ◽  
2018 ◽  
Vol 67 (12) ◽  
Keyword(s):  
Tensile Strength ◽  
Yield Strength ◽  
Tensile Properties ◽  
Yield Point ◽  
Precipitation Hardening ◽  
High Strength ◽  
Strength Properties ◽  
Cold Forming ◽  
Fine Grained

Abstract MHZ 420 (mininum yield strength of 420 MPa) is one of a series of microalloyed cold forming steels. The high-strength properties result from precipitation hardening thanks to finely-dispersed carbonitrides and a fine-grained microstructure. Even very small amounts of the elements titanium and/or niobium in the region of 0.01% result in a significant increase in the yield point and tensile strength. This datasheet provides information on composition and tensile properties as well as fatigue. It also includes information on forming and joining. Filing Code: SA-831. Producer or source: ThyssenKrupp Steel Europe AG.

MHZ 380

Alloy Digest ◽  
2018 ◽  
Vol 67 (11) ◽  
Keyword(s):  
Tensile Strength ◽  
Yield Strength ◽  
Tensile Properties ◽  
Yield Point ◽  
Precipitation Hardening ◽  
High Strength ◽  
Strength Properties ◽  
Cold Forming ◽  
Fine Grained

Abstract MHZ 380 (mininum yield strength of 380 MPa) is one of a series of microalloyed cold forming steels. The high-strength properties result from precipitation hardening thanks to finely-dispersed carbonitrides and a fine-grained microstructure. Even very small amounts of the elements titanium and/or niobium in the region of 0.01% result in a significant increase in the yield point and tensile strength. This datasheet provides information on composition and tensile properties as well as fatigue. It also includes information on forming and joining. Filing Code: SA-828. Producer or source: ThyssenKrupp Steel Europe AG.

Plasticity Enhancement of MoSi2 at Elevated Temperatures Through the Addition of TiC

1992 ◽  
Vol 273 ◽  
Author(s):  
H. Chang ◽  
H. Kung ◽  
R. Gibala
Keyword(s):  
Brittle Fracture ◽  
Strain Hardening ◽  
Elevated Temperatures ◽  
Particulate Composites ◽  
Dislocation Generation ◽  
Hardening Behavior ◽  
Lower Strain ◽  
The Matrix ◽  
Strain Hardening Behavior ◽  
Strain Hardening Rate

ABSTRACTMonolithic MoSi2 and MoSi2-TiC particulate composites with 10 vol % and 15 vol % TiC were tested in compression between 950°C and 1200°C. The MoSi2-TiC composites can be deformed plastically at lower temperatures than MoSi2 can before brittle fracture occurs. The composites exhibit much lower strain hardening rates and attain zero strain hardening rate at much lower strains than monolithic MoSi2. The differences between the composites and monolithic MoSi2 in plasticity and in strain hardening behavior is attributed to efficient dislocation generation into the matrix from sources at the MoSi2-TiC interfaces.

MHZ 460

Alloy Digest ◽  
2019 ◽  
Vol 68 (1) ◽  
Keyword(s):  
Tensile Strength ◽  
Yield Strength ◽  
Tensile Properties ◽  
Yield Point ◽  
Precipitation Hardening ◽  
High Strength ◽  
Strength Properties ◽  
Cold Forming ◽  
Fine Grained

Abstract MHZ 460 (mininum yield strength of 460 MPa) is one of a series of microalloyed cold forming steels. The high-strength properties result from precipitation hardening thanks to finely-dispersed carbonitrides and a fine-grained microstructure. Even very small amounts of the elements titanium and/or niobium in the region of 0.01% result in a significant increase in the yield point and tensile strength. This datasheet provides information on composition and tensile properties as well as fatigue. It also includes information on forming and joining. Filing Code: SA-835. Producer or source: ThyssenKrupp Steel Europe AG.

MHZ 500

Alloy Digest ◽  
2019 ◽  
Vol 68 (2) ◽  
Keyword(s):  
Tensile Strength ◽  
Yield Strength ◽  
Tensile Properties ◽  
Yield Point ◽  
Precipitation Hardening ◽  
High Strength ◽  
Strength Properties ◽  
Cold Forming ◽  
Fine Grained

Abstract MHZ 500 (mininum yield strength of 500 MPa) is one of a series of microalloyed cold forming steels. The high-strength properties result from precipitation hardening thanks to finely-dispersed carbonitrides and a fine-grained microstructure. Even very small amounts of the elements titanium and/or niobium in the region of 0.01% result in a significant increase in the yield point and tensile strength. This datasheet provides information on composition and tensile properties as well as fatigue. It also includes information on forming and joining. Filing Code: SA-837. Producer or source: ThyssenKrupp Steel Europe AG.

Sign in / Sign up

Export Citation Format

Share Document