【摘要】：在DZ125L定向基材上進(jìn)行激光直接成形同種材料的定向生長(zhǎng)修復(fù),對(duì)修復(fù)后的DZ125L熔覆組織進(jìn)行了微觀分析和常溫力學(xué)性能測(cè)試,并對(duì)熔覆組織與定向基材的結(jié)合面強(qiáng)度進(jìn)行了測(cè)試。結(jié)果表明:激光直接成形DZ125L的組織為外延生長(zhǎng)的柱狀晶組織,其一次枝晶間距為8~12μm,二次枝晶退化,熱處理后柱狀晶尺寸增大為30~90μm,柱狀晶基體上析出大量均勻分布的γ′強(qiáng)化相;沉積態(tài)柱狀晶組織的縱向抗拉強(qiáng)度為1312 MPa,延伸率為5.27%,熱處理后柱狀晶組織的縱向抗拉強(qiáng)度降低為1201 MPa,延伸率達(dá)到6.69%,均滿足國(guó)家標(biāo)準(zhǔn);熔覆層柱狀晶組織與定向基材的結(jié)合面力學(xué)性能良好,定向生長(zhǎng)滿足使用要求。
[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 緯 '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.
【作者單位】： 西安交通大學(xué)機(jī)械制造系統(tǒng)工程國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金(51275392)
【分類號(hào)】：TG665

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