LD冷作模具鋼激光表面熔凝
發(fā)布時間：2018-07-29 17:29
【摘要】：研究了冷作模具LD鋼經(jīng)不同工藝參數(shù)激光熔凝處理后的顯微組織及性能。結(jié)果表明,激光功率P=3500 W,掃描速度v=20 mm/s,光斑直徑d=5 mm時,處理效果較為理想。由表及里依次為熔凝層、淬火層、熱影響層和基體。熔凝層又依次分為表層等軸晶區(qū),柱狀晶區(qū)和等軸晶+胞狀晶區(qū)。等軸晶區(qū)和柱狀晶區(qū)原有的帶狀、塊狀碳化物全部溶解,胞狀晶區(qū)原有的碳化物基本保持原狀,新晶粒明顯細化并均勻分布。硬化層總深度可達1.0 mm;平均硬度可提高15%左右,耐磨性和耐腐蝕性顯著提高。如果能量密度過大,在熔凝層容易產(chǎn)生微裂紋甚至宏觀裂紋,破壞材料性能。
[Abstract]:The microstructure and properties of LD steel of cold working die treated by laser melting with different technological parameters were studied. The results show that the processing efficiency is satisfactory when the laser power is 3 500 W, the scanning speed is 20 mm / s, and the spot diameter is 5 mm. The order from surface to interior is melting layer, quenching layer, heat affected layer and matrix. The melting layer is divided into the surface equiaxed crystal zone, the columnar crystal zone and the equiaxed crystal cell crystal area in turn. The carbides in the equiaxed and columnar regions are completely dissolved, and the original carbides in the cellular crystalline regions remain basically the same, and the new grains are obviously refined and uniformly distributed. The total depth of hardened layer can reach 1.0 mm, the average hardness can be increased by about 15%, and the wear resistance and corrosion resistance can be improved significantly. If the energy density is too high, microcracks or even macroscopic cracks will occur in the melting layer, which will destroy the properties of the material.
【作者單位】： 上海工程技術(shù)大學工程實訓中心;
【分類號】：TG174.4
[Abstract]:The microstructure and properties of LD steel of cold working die treated by laser melting with different technological parameters were studied. The results show that the processing efficiency is satisfactory when the laser power is 3 500 W, the scanning speed is 20 mm / s, and the spot diameter is 5 mm. The order from surface to interior is melting layer, quenching layer, heat affected layer and matrix. The melting layer is divided into the surface equiaxed crystal zone, the columnar crystal zone and the equiaxed crystal cell crystal area in turn. The carbides in the equiaxed and columnar regions are completely dissolved, and the original carbides in the cellular crystalline regions remain basically the same, and the new grains are obviously refined and uniformly distributed. The total depth of hardened layer can reach 1.0 mm, the average hardness can be increased by about 15%, and the wear resistance and corrosion resistance can be improved significantly. If the energy density is too high, microcracks or even macroscopic cracks will occur in the melting layer, which will destroy the properties of the material.
【作者單位】： 上海工程技術(shù)大學工程實訓中心;
【分類號】：TG174.4
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