Effect of aluminizing and oxidation on the thermal fatigue damage of hot work tool steels for high pressure die casting applications

Abstract

et al.. Effect of aluminizing and oxidation on the thermal fatigue damage of hot work tool steels for high pressure die casting applications. A B S T R A C TThe interaction between thermal fatigue and aluminizing and/or oxidation is investigated using an experimental approach based on decoupling of mechanisms. Virgin and pre-aluminized steel specimens are tested in air and nitrogen between 100 and 650°C. Homogeneous uniaxial micro-crack network forms on the oxidised or prealuminized surface in air, with a better resistance to micro-cracking for the intermetallic coating. The propagation of the micro-cracks is delayed in nitrogen, whilst no evidence of micro-cracking is observed on the virgin specimen. The premature cracking of the steel depends on the formation of the superficial micro-crack network, and the crack propagation is assisted by oxidation.

The Effect of Heat Treatments on the Fatigue Strength of H13 Hot Work Tool Steel

“…This helps to explain the maximum fatigue strength at double tempering. Moreover, the formation of more stable carbide by double tempering can explain the mechanical properties of the material and thus the fatigue strength [3,5] . The carbides herein are found to be Mo6C, Cr2C3, VC and this is in accordance with the literature [6,7,17,23] .…”

“…In the context of alloyed steel and hot metal forming, the most important component of any process usually reveals to be the die, since its requirement of exceptional precision and reliability increase the cost. Dies generally experience rather high cyclic temperatures variations and mechanical loading; they work in erosive/corrosive environment [2,3] and consequently suffer mechanical and thermal fatigue [4,5,6,7] . In an attempt to prolong their working life, improve efficiency and reduce cost of processing; they are produced of hot work steel material.…”

Impact of Cladding Technology on Residual Stresses within the Renovation of High Pressure Die Casting Molds

“…Before oxidation or aluminization, the mold surfaces are protected by lubricating coatings. These can still be removed in areas of high erosive stress by the pressure of the flowing metal [6,7].…”

Thermal Fatigue Testing of SiMoCr Compacted Graphite Cast Iron for HPDC Tooling Application

“…Optimal heat treatment parameters, processing parameters, appropriate microstructure, etc., were studied. [2][3][4][5][6][7][8] Cast irons were also tested on thermal fatigue resistance where the influence of graphite particle shape and amount, test temperature, etc., were studied. [9][10][11][12][13][14][15][16][17][18][19][20][21] In the studies of Bombač et al 22 and Terčelj et al, 23 new test rig for thermal fatigue resistance was used where used test samples enable quantification of thermal fatigue resistance.…”