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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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热处理对高nb-tial合金板材组织及力学性能的影响
Keywords: 金属材料,高nb-tial合金,包套热轧,热处理,双态组织,力学性能
Abstract:
？研究了不同热处理工艺对高nb-tial合金板材的显微组织及力学性能的影响。采用铸锭原料直接包套热轧制备的板材主要由残余粗化的片层团、再结晶γ晶粒和沿轧制方向带状分布的β相组成。通过不同的热处理工艺可以消除残余片层和β相,分别获得典型的双态组织、近片层组织和全片层组织。对热处理后具有双态组织的板材进行了室温和高温力学性能测试,结果表明:经热处理后,热轧板材的室温延伸率达到0.5%,屈服强度和抗拉强度分别提高到646mpa和691mpa,与铸态相比,其室温强度和塑性得到了改善,在850-900℃之间材料发生韧脆转变,并且相应断裂机理从脆性的穿晶断裂转变为孔洞的形核和聚集。
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