High temperature tensile properties of laser-welded high-strength Mg-Gd-Y-Zr alloy in as-welded and heat-treated conditions

2016 ◽  
Vol 61 (2) ◽  
pp. 299-306 ◽  
Author(s):  
Lyuyuan Wang ◽  
Jian Huang ◽  
Jie Dong ◽  
Zhuguo Li ◽  
Yixiong Wu
Keyword(s):  
High Temperature ◽  
Tensile Properties ◽  
High Strength ◽  
Heat Treated ◽  
High Temperature Tensile ◽  
High Temperature Tensile Properties ◽  
Zr Alloy

scholarly journals Effect of Welding Speed and Post Quenching on the Microstructure and Mechanical Properties of Laser-Welded B1500HS Joints

Materials ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 4645
Author(s):  
Muyu Li ◽  
Dan Yao ◽  
Yingping Guan ◽  
Yongchuan Duan ◽  
Liu Yang
Keyword(s):  
High Temperature ◽  
Tensile Properties ◽  
Fusion Zone ◽  
Weld Joint ◽  
Welding Speed ◽  
Grain Morphology ◽  
High Strength ◽  
Microhardness Distribution ◽  
High Temperature Tensile ◽  
High Temperature Tensile Properties

In this research, B1500HS high-strength steel with different thicknesses were laser welded, and the effects of welding speed and post quenching were investigated by analyzing the microstructure, microhardness distribution, and high-temperature tensile properties of weld joints. The results show that an obvious difference can be found in the metallographic structure and grain morphology of the weld joint at different locations, which also lead to the significant uneven distribution of hardness. After quenching, the grain size of the original heat-affected zone was uniform, the columnar grains in the fusion zone were transformed into fine equiaxed grains, and no obvious hardness difference can be found in the weld joint. For the weld joint without quenching, the increase of welding speed can reduce the dimensions of grains of fusion zone and coarse grain zone, and slightly increase the hardness of these regions. In contrast, welding speed change has little influence on the microstructure and hardness of the weld joint after quenching. The high-temperature flow stress–strain curves of fusion zone welded under different welding speeds were calculated based on the mixture rule. The analysis results indicated that the fusion zone has higher strength but lower elongation than the base metal. In addition, the change of welding speed has a small impact on the high-temperature tensile properties of the fusion zone.

Characteristics of High Temperature Tensile Properties and Residual Stresses in Welded Joints of the SM570-TMCP Steel

2007 ◽  
Vol 353-358 ◽  
pp. 527-532 ◽  
Author(s):  
Chin Hyung Lee ◽  
H.C. Park ◽  
Gab Chul Jang ◽  
J.H. Lee ◽  
Kyong Ho Chang
Keyword(s):  
High Temperature ◽  
Residual Stresses ◽  
Tensile Properties ◽  
Welded Joints ◽  
Three Dimensional ◽  
Control Process ◽  
Steel Structures ◽  
High Strength ◽  
High Temperature Tensile ◽  
High Temperature Tensile Properties

TMCP steels produced by thermo-mechanical control process are now spot lighted due to the excellent combinations of strength, toughness and weldability. Recently, in Korea, high strength SM570-TMCP steel whose tensile strength is 600MPa has been developed and applied to steel structures due to its excellent nature. But, for the application of the TMCP steel to steel structures, it is necessary to elucidate not only the material characteristics but the mechanical characteristics of welded joints. In this study, high temperature tensile properties of the SM570-TMCP steel were investigated through the elevated temperature tensile test and the characteristics of residual stresses in welded joints of the TMCP steel were studied through the three-dimensional (3-D) thermal elastic-plastic finite element (FE) analysis on the basis of mechanical properties at high temperatures obtained from the experiment. The results are then compared with the conventional quenched and tempered high strength SM570 steel.

scholarly journals On the Elevated Temperature, Tensile Properties of Al-Cu Cast Alloys: Role of Heat Treatment

2019 ◽  
Vol 2019 ◽  
pp. 1-15
Author(s):  
A. Girgis ◽  
A. M. Samuel ◽  
H. W. Doty ◽  
S. Valtierra ◽  
F. H. Samuel
Keyword(s):  
Heat Treatment ◽  
High Temperature ◽  
Tensile Properties ◽  
Treatment Conditions ◽  
Heat Treated ◽  
Cast Alloys ◽  
High Temperature Tensile ◽  
High Temperature Tensile Properties ◽  
Optimum Alloy

The present study aims to investigate the mechanical properties of a newly developed aluminum Al-6.5% Cu-based alloy, coded HT200, as well as to determine how these properties can be further improved using grain refinement and heat treatment. As a result, the effects of different heat treatments and alloying additions on the ambient and high-temperature tensile properties were examined. Three alloys were selected for this study: (i) the base HT200 alloy (coded A), (ii) the base HT200 alloy containing 0.15% Ti + 0.15% Zr (coded B), and (iii) the base HT200 alloy containing 0.15% Ti + 0.15% Zr + 0.5%Ag (coded C). The properties of the three HT200 alloys were compared with those of 319 and 356 alloys (coded D and E, respectively), subjected to the same heat treatment conditions. The results obtained show the optimum high-temperature tensile properties and Q-values for the five alloys of interest, along with the corresponding heat treatment conditions associated with these properties. It was found that the T6 heat-treated alloy B was the optimum alloy in terms of properties obtained, with values comparable to those of commercial B319.0 and A356.0 alloys.

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