Effect of solution treatment temperature and cooling rate on the mechanical properties of tungsten heavy alloy

The Effect of Cold Swaging of Tungsten Heavy Alloy with the Composition W91-6Ni-3Co on the Mechanical Properties

“…After annealing, the total time of which was 9 h, and the rods were cooled rapidly [ 26 ]. The annealing temperature and time were selected based on previous tests [ 27 , 28 , 29 , 30 ].…”

Microstructure and strengthening mechanisms of 90W–7Ni–3Fe alloys prepared using laser melting deposition

“…After solidification, the faster cooling rate of LMD compared to the slow furnace cooling during LPS can further limit the extent of grain growth during solid-state cooling (feature iii). As a consequence, thermal stresses can develop during cooling in the composite because of the difference in coefficients of thermal expansion (CTE) between W and the NiFeW matrix (see Table 3) [14,33]. The presence of W particles with a smaller CTE in a matrix with a larger CTE is likely to lead to compressive thermal stresses in both phases during solid-state cooling.…”

“…This mismatch may have a number of different sources. Within the large matrix 'colonies', the W particles are completely surrounded by one matrix grain; detrimental elements are less likely to be segregated at those interfaces due to the fast cooling rate [14]. Both factors may be beneficial for improving the interface bonding strength.…”

“…Many new processing methods have recently been developed either to improve the wetting behavior by chemical alloying [5,9] or to refine the microstructure by e.g. reducing the processing time [2,[10][11][12][13][14][15][16]. Among these methods, additive manufacturing (AM), using methods such as laser melting deposition (LMD) or selective laser melting (SLM), has attracted much interest due to its potential to allow near net-shape manufacturing of complex components directly from digital models [15][16][17][18][19][20][21][22][23][24][25][26][27].…”

Experimental Verification of Mechanical Properties of Thungsten Heavy Alloys After Hot Rotary Swaging and Annealing

“…Alloying elements in THA ensure the plasticity of the material, a negative effect is a reduction in strength. For optimal strength and plastic properties, we can use a change in chemical composition or improvement of properties through plastic deformation [5][6][7][8][9]. Suitable technologies are processes that are continuous, such as ECAP-conform [10] or rotary swaging (RS).…”