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Strengthening technology and mechanism for semi-solid die casting of aluminum alloy 总被引:10,自引:0,他引:10
Combined with theoretical evaluation,an optimized strengthening process for the semi-solid die castings of A356 aluminum alloy was obtained by studying the mechanical properties of castings solution treated and aged under different conditions in detail,then,the semi-solid die castings and liquid die castings were heat treated with the optimized process.The results show that the mechanical properties of semi-solid die castings of aluminum alloy are superior to those of the liquid die castings,especially the strengthening degree of heat treated semi-solid die castingsis much greater than that of liquid die castings with the tensile strength more than 330 MPa and the elongation more than 10%,and this is mainly contributed to the non-dendritic and more compact microstructure of semi-solid die castings.The strengthening mechanism of heat treatment for the semi-solid die castings of A356 aluminum alloy is due to the dispersive precipitation of the second phase(Mg2 Si) and formation of GP Zone. 相似文献
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AlSi7Mg合金半固态压铸件热处理强化机理研究 总被引:6,自引:0,他引:6
对AlSi7Mg合金(A356)半固态压铸件和液态压铸件进行了不同工艺的固溶与时效热处理,分析了其显微组织与疏松度,测定了硬度、拉伸强度及延伸率等力学性能。实验得出,铝合金半固态压铸件原始态的力学性能优于液态压铸件,并且半固态压铸件时效强化效果尤其明显,拉伸强度可达330MPa以上,延伸率10%以上。这主要是由于半固态压铸件比液压件具有更加致密,且为球状的非树枝晶组织。铝合金半固态压铸件时效强化,机理主要归于弥散析出Mg2Si强化相。 相似文献
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Cr-Ni-Mo合金渗碳钢由于钢中合金元素和碳的偏析,经一般退火后存在比较严重的带状组织。合金渗碳钢制和轿车变速箱齿轮时,必须在锻后热处理过程中控制带状组织级别。为了准确地评定带状组织的级别,首先应计算出Cr-Ni-Mo材料的碳当量,然后根据碳当量选用国标GB/T13299-91中的系列标准。根据选定的标准,除条带数量及连续性外并考虑组织中条带的宽窄,对每次试验后的带状组织作比较准确的评定。 相似文献
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ReviewofthePapersinthe11thInternationalHeatTreatmentConferenceXuLuopingLiLinMaXuemingShaoGuangjieSchoolofMaterial,ShanghaiUniversity综述1概况由IFHT(国际热处理联合会)和ASM(美国金属学会)的欧洲委员会联合召开的第十一届材料热处理及表面工程大会于10月19~21 相似文献