本文選題：激光技術(shù) + 選區(qū)激光熔化�。� 參考：《激光與光電子學(xué)進(jìn)展》2017年07期

【摘要】：根據(jù)柱狀晶向等軸晶轉(zhuǎn)變(CET)圖,建立了激光熔池橫截面的幾何關(guān)系,得出了選區(qū)激光熔化(SLM)鎳基單晶高溫合金的凝固條件與顯微組織的關(guān)系,并在SRR99單晶基板的(100)晶面上沿[001]方向進(jìn)行了SLM實(shí)驗(yàn)。結(jié)果表明,當(dāng)激光功率為160 W、鋪粉層厚為20μm、掃描速率V_b≤30m·min~(-1)時(shí),凝固速度與激光掃描速度的夾角最小值為46.4°(大于45°)�？梢灶A(yù)測(cè)激光熔池組織僅由熔池底部向頂部生長(zhǎng)的[001]枝晶和熔池兩側(cè)的[010]枝晶組成,實(shí)驗(yàn)結(jié)果與理論分析結(jié)果相吻合,且層間形成了良好的冶金結(jié)合,基層的結(jié)晶取向得到延續(xù)。
[Abstract]:Based on the CET diagram of columnar crystal to equiaxed crystal, the geometrical relationship of cross section of laser melting pool is established, and the relationship between solidification conditions and microstructure of selective laser melting nickel base single crystal superalloy is obtained.SLM experiments were carried out on the crystal plane of SRR99 single crystal substrate in the direction of [001].The results show that the minimum angle between solidification velocity and laser scanning velocity is 46.4 擄(> 45 擄) when the laser power is 160 W, the coating thickness is 20 渭 m and the scanning rate is V _ (B) 鈮，

本文編號(hào)：1769756