Studies on the structures and various properties of Lo-Ex (2nd Report)
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In the 1st report(1), the authors made studies on the structures and various properties of Lo-Ex alloy for cast pistons. Continued from the 1st report, the relation between the structures and properties by several heat-treatment is studied in this paper.The results are summarized as follows.(1) Among physical properties, it was conspicuous that coefficient of thermal expansion of hyper-eutectic type was smaller than that of hypo-eutectic type.(2) Lo-Ex of hyper-eutectic type generally showed better tensile properties than hypo-eutectic type at room temperature. These properties were particularly remarkable at 0.2% of proof stress. However, almost no difference between two types of alloy was seen in hardness.As to the effects of heat-treatment method, T6 had the best effects on the both alloys, while little differences were seen among others, T4, T5, and T7.(3) There was little difference between the both types of Lo-Ex in abrasion resistance at room temperature.(4) Ultimate tensile strength of the both types of Lo-Ex at any temperatures above 250°C was almost equal in value.(5) From the standpoint of structural types, creep resistance of Lo-Ex of hyper-eutectic type was higher than that of hypo-eutectic type at both of 200 and 300°C. As to the effects of heat-treatment method, the degree of improvement in creep resistance was arranged in ascending order of T7, T6, T4, T5, and F.(6) Lo-Ex of hyper-eutectic type had excellent properties of degassing.In general, Lo-Ex of hyper-eutectic type is considered to be excellent in various properties. However, the degree of superiority or inferiority of mechanical properties due to the differences of heat-treatment methods is not the same in each item of measurements. Accordingly, it is more desirable to adopt proper structural type of Lo-Ex and method of heat-treatment in consideration of the size of piston produced and other economic factors involved.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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