Effect of Alloying Elements on Microstructure and Mechanical Properties of High Temperature Die Material DM02 Alloy

2007 ◽  
Vol 546-549 ◽  
pp. 1257-1260
Author(s):  
Jin Xia Song ◽  
Qing Li ◽  
Cheng Bo Xiao ◽  
Ya Fang Han
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
High Strength ◽  
Alloying Elements ◽  
Strengthening Effect ◽  
Die Material ◽  
High Temperature Tensile ◽  
High Temperature Tensile Properties ◽  
Base Superalloy ◽  
Better Than

The effect of Ta, Nb, Hf and Zr on the microstructure and high temperature tensile properties of DM02 alloy, which is a novel developed Ni base superalloy for high temperature die material, had been studied in this paper. The results showed that the four alloying elements affect the composition and morphology of carbides obviously, and have almost no effect on the morphology and size of γ´ phase in DM02 alloy. 0.5-1wt% Hf make the morphology of MC carbide change from bone-like to blocky and inhibit the formation of primary M6C carbide, thus improve the ductility of DM02 alloy, while 0.1wt% Zr has no similar effect. The strengthening effect of 3wt% Ta is better than that of 1.5wt% Nb. DM02 alloy with 3wt% Ta and 0.5wt% Hf has high strength and good ductility at 1050°C.

Effect of CaO Addition on High Temperature Tensile Properties of Mg Casting Alloys

2009 ◽  
Vol 620-622 ◽  
pp. 291-294 ◽  
Author(s):  
Jung Ho Seo ◽  
Shae K. Kim
Keyword(s):  
Solid Solution ◽  
High Temperature ◽  
Tensile Properties ◽  
Alloy Element ◽  
Good Effect ◽  
Casting Alloys ◽  
Ca Addition ◽  
High Temperature Tensile ◽  
High Temperature Tensile Properties ◽  
Better Than

The microstructure, hardness and tensile properties of Mg-3Al, Mg-3Al-1.2Ca(AX31), Mg-3Al-1.2CaO(AO31), Mg-9Al, Mg-9Al-1.2Ca(AX91) and Mg-9Al-1.2CaO(AO91) alloys were investigated to identify the effect of CaO addition compared with Ca addition. The results show that the alloy element CaO has a good effect on high temperature tensile properties and CaO added alloys have superior high temperature performance compared with Ca added alloys. Addition of CaO results in the precipitation of Al2Ca phase (C15 phase) on the grain boundaries. This phase precipitated by the reduction of CaO leads to the refinement of a microstructure and improvement of tensile properties at elevated temperature similar to the Ca added Mg alloys. When added into molten Mg Ca makes solid solution in the Mg matrix up to 0.8wt %. But in case of CaO addition the thermally stable compound is precipitated directly without making solid solution with Mg matrix. Therefore, the high temperature tensile properties of CaO added Mg casting alloys are better than Ca added one at the same adding contents (1.2wt.%).

The Effect of Microalloying B on the High Temperature Mechanical Properties of Ti3Al

1988 ◽  
Vol 133 ◽  
Author(s):  
Joseph W. Newkirk ◽  
Gerald B. Feldewerth
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Tensile Properties ◽  
Grain Refinement ◽  
High Temperature Mechanical Properties ◽  
High Temperature Tensile ◽  
High Temperature Tensile Properties

ABSTRACTThe effect of adding boron to Ti3Al on the microstructure and high temperature tensile properties has been studied. Boron caused a large grain refinement that dominated the tensile properties at all temperatures. Particles of Ti2B were found in all of the boron containing alloys. TiB was found only at concentrations of 0.1% B or more.

scholarly journals The Effect of the Cooling Rates on the Microstructure and High-Temperature Mechanical Properties of a Nickel-Based Single Crystal Superalloy

Materials ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 4256
Author(s):  
Xiao-Yan Wang ◽  
Meng Li ◽  
Zhi-Xun Wen
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Single Crystal ◽  
Solution Treatment ◽  
Single Crystal Superalloy ◽  
Air Cooling ◽  
Strengthening Effect ◽  
Cooling Rates ◽  
High Temperature Mechanical Properties ◽  
High Temperature Tensile

The as-cast alloy of nickel-based single-crystal superalloy was used as the research object. After four hours of solution treatment at 1315 °C, four cooling rates (water cooling (WC), air cooling (AC) and furnace cooling (FC1/FC2)) were used to reduce the alloy to room temperature. Four different microstructures of nickel-based superalloy material were prepared. A high-temperature tensile test at 980 °C was carried out to study the influence of various rates on the formation of the material’s microstructure and to further obtain the influence of different microstructures on the high-temperature mechanical properties of the materials. The results show that an increase of cooling rate resulted in a larger γ′ phase nucleation rate, formation of a smaller γ′ phase and a greater number. When air cooling was used, the uniformity of the γ′ phase and the coherence relationship between the γ′ phase and the γ phase were the best. At the same time, the test alloy had the best high-temperature tensile properties, and the material showed a certain degree of plasticity. TEM test results showed that the test alloy mainly blocked dislocations from traveling in the material through the strengthening effect of γ′, and that AC had the strongest hindering effect on γ′ dislocation movement.

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.

Effect of Sb, Sn and Pb Additions on the Microstructure and Mechanical Properties of AZ91 Alloy

2015 ◽  
Vol 830-831 ◽  
pp. 375-378 ◽  
Author(s):  
Arun Boby ◽  
Amirthalingam Srinivasan ◽  
Uma Thanu Subramonia Pillai ◽  
Bellambettu Chandrasekhara Pai
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Tensile Properties ◽  
Grain Refinement ◽  
Az91 Alloy ◽  
Precipitation Sequence ◽  
Microstructure And Mechanical Properties ◽  
High Temperature Tensile ◽  
High Temperature Tensile Properties

This article presents the effect of individual addition of Sb, Sn and Pb on the precipitation sequence at room as well as high temperature tensile properties of AZ91 alloy. The results show grain refinement, formation of Mg3Sb2 and Mg2Sn phases when Sb and Sn are added to AZ91 alloy. Lamellar precipitate is significantly suppressed while Pb added. Improved room and high temperature tensile properties are observed in Sb and Sn addition. Maximum tensile properties are noticed with AZ91 alloy having 0.5 wt.% Sb addition.

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