激光定向生长修复DZ125L柱状晶叶片力学性能研究

发布时间：2018-12-21 12:58

【摘要】：在DZ125L定向基材上进行激光直接成形同种材料的定向生长修复,对修复后的DZ125L熔覆组织进行了微观分析和常温力学性能测试,并对熔覆组织与定向基材的结合面强度进行了测试。结果表明:激光直接成形DZ125L的组织为外延生长的柱状晶组织,其一次枝晶间距为8~12μm,二次枝晶退化,热处理后柱状晶尺寸增大为30~90μm,柱状晶基体上析出大量均匀分布的γ′强化相;沉积态柱状晶组织的纵向抗拉强度为1312 MPa,延伸率为5.27%,热处理后柱状晶组织的纵向抗拉强度降低为1201 MPa,延伸率达到6.69%,均满足国家标准;熔覆层柱状晶组织与定向基材的结合面力学性能良好,定向生长满足使用要求。
[Abstract]:The laser direct forming of the same material was carried out on the DZ125L oriented substrate. The microstructure of the DZ125L cladding after repairing was analyzed and the mechanical properties at room temperature were tested. The strength of the bonding surface between the cladding structure and the oriented substrate was also measured. The results show that the structure of DZ125L grown by laser is columnar structure grown by epitaxial growth. The primary dendrite spacing is 812 渭 m, the secondary dendrite degenerates, and the columnar crystal size increases to 30 ~ 90 渭 m after heat treatment. A large number of uniformly distributed 纬 'strengthened phases were precipitated on the columnar matrix. The longitudinal tensile strength of the deposited columnar structure is 1312 MPa, and the longitudinal tensile strength of the columnar structure decreases to 1201 MPa, after heat treatment, which meets the national standard. The mechanical properties of the bonding surface of the cladding columnar crystal structure and the oriented substrate are good, and the directional growth meets the requirements of application.
【作者单位】：西安交通大学机械制造系统工程国家重点实验室;
【基金】：国家自然科学基金(51275392)
【分类号】：TG665

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