本文關(guān)鍵詞： 激光技術(shù) 激光材料加工 激光直接成形 DD零件 裂紋消除 感應(yīng)加熱　出處：《中國(guó)激光》2017年02期 　論文類型：期刊論文

【摘要】：針對(duì)單晶鎳基高溫合金DD4在激光直接成形過(guò)程中熔覆層開(kāi)裂的問(wèn)題,利用不同工藝在定向凝固DZ125L基體上成形DD4零件,研究了DD4零件熔覆層的裂紋種類和裂紋特征以及基本工藝參數(shù)對(duì)DD4零件裂紋率的影響。提出了利用感應(yīng)加熱輔助激光直接成形的方法來(lái)消除DD4零件熔覆層裂紋。結(jié)果表明,DD4零件熔覆層裂紋分為凝固裂紋和液化裂紋兩種,其中絕大多數(shù)裂紋為液化裂紋;降低激光功率,增大掃描速度,選取合適的搭接間距和提升量都有利于降低DD4零件熔覆層的裂紋率。試驗(yàn)中通過(guò)優(yōu)化工藝參數(shù),可將DD4零件裂紋率降低至0.230mm/mm~2。裂紋率會(huì)隨著感應(yīng)加熱溫度的升高而下降,感應(yīng)加熱溫度為1200℃時(shí)裂紋率可降低至0.017mm/mm~2。
[Abstract]:In order to solve the problem of cladding cracking of single crystal nickel base superalloy DD4 in laser direct forming process, DD4 parts were formed on directionally solidified DZ125L substrate by different processes. The crack types and crack characteristics of the cladding layer of DD4 parts and the influence of basic process parameters on the crack rate of DD4 parts are studied. The method of direct laser forming assisted by induction heating is proposed to eliminate the DD4 parts. Cladding cracks. The results show that. The cladding cracks of DD4 parts can be divided into solidification cracks and liquefied cracks, most of which are liquefaction cracks. Reducing laser power, increasing scanning speed, choosing appropriate lap spacing and lifting amount are all helpful to reduce the crack rate of DD4 cladding layer. The process parameters are optimized in the experiment. The crack rate of DD4 parts can be reduced to 0.230 mm / mm 2. The crack rate decreases with the increase of induction heating temperature. When the temperature of induction heating is 1200 鈩，

本文編號(hào)：1445046