アルミニウム合金ダイカストの破壊靱性および疲労き裂進展特性に及ぼす熱処理の影響

概要

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Effects of aging temperature and the casting method, squeeze casting and Pore-Free (PF) method on fracture mechanic characteristics were investigated for aluminum alloy die castings ADC12. The results are as follows. (1) For both methods, the mechanical properties improve and fracture toughness increases due to heat treatment. The tensile strength and the 0.2% proof stress are greatest at the smallest aging temperature of 473K, while the strain to failure and fracture toughness are the lowest. (2) For as-cast die castings, the mechanical properties in the case of squeeze casting are worse than these in the case of using the PF method. On the other hand, fracture toughness of squeeze casting is the same as that of the PF method. (3) For both methods, fatigue crack growth resistance in the low-ΔK region decreases due to the transition from eutectic Si to spheres. (4) In the Paris regime and high-ΔK region, fatigue crack growth resistance increases due to heat treatment and is almost the same for both casting methods.
一般社団法人日本機械学会の論文
1997-03-25