| DZ125合金表面碳化铬／Ni_3Al堆焊涂层显微组织 |
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| 引用本文： | 李尚平,骆合力,曹栩,张喜娥,冯涤. DZ125合金表面碳化铬／Ni_3Al堆焊涂层显微组织[J]. 金属学报, 2008, 44(12) |
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| 作者姓名： | 李尚平 骆合力 曹栩 张喜娥 冯涤 |
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| 作者单位： | 钢铁研究总院高温材料研究所,北京100081 |
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| 基金项目： | 国家高技术研究发展计划资助项目2002AA331070~~ |
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| 摘 要： | 采用药芯焊丝法制得Ni—Al-Cr3C2复合焊丝，将该焊丝堆焊于DZ125合金表面．在氩弧物理热的作用下，Ni与Al化合成Ni3Al并释放大量反应热；Cr3C2发生分解，并在随后凝固过程中重新析出细小的富Cr的M3C2和M7C3相．受冷却速率的影响，靠近母材区域的碳化物尺寸小于外层区域．母材合金元素进入焊接熔池中，发生一系列碳化和氧化反应，生成的化合物按自由能高低随温度降低顺序析出，导致在焊接熔合区形成大量富Hf，Ta，Ti和W的MC复合碳化物和少量氧化物，距焊层表面越近，数量越少直至消失．
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| 关 键 词： | 碳化铬 Ni3Al 复合材料 微观组织 镍基高温合金 |
MICROSTRUCTURE OF PILE-UP WELDING CHROMIUM CARBIDE/Ni_3Al COMPOSITE CLADDING ON DZ125 ALLOY |
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| LI Shangping LUO Heli CAO Xu ZHANG Xi'e FENG Di High Temperature Materials Research Institute,Central Iron , Steel Research Institute,Beijing. MICROSTRUCTURE OF PILE-UP WELDING CHROMIUM CARBIDE/Ni_3Al COMPOSITE CLADDING ON DZ125 ALLOY[J]. Acta Metallurgica Sinica, 2008, 44(12) |
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| Authors: | LI Shangping LUO Heli CAO Xu ZHANG Xi'e FENG Di High Temperature Materials Research Institute Central Iron & Steel Research Institute Beijing |
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| Affiliation: | LI Shangping LUO Heli CAO Xu ZHANG Xi'e FENG Di High Temperature Materials Research Institute,Central Iron & Steel Research Institute,Beijing 100081 |
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| Abstract: | A Ni-Al-Cr_3C_2 welding wire produced by metal-powder-core technique was pile-up welded on the surface of DZ125 alloy.During welding,the physical heat of arc and Ni-Al exothermic reaction made Ni react with Al to form Ni_3Al as matrix,and the precipitated Cr_3C_2 dissolve again to form fine Cr-rich M3_C_2 and M_7C_3 phases distributed in matrix during solidification.The size of chromium carbide particles near the coating/substrate interface is smaller than that near the surface of welding layer due to the d... |
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| Keywords: | chromium carbide Ni_3Al composite microstrueture Ni base supperalloy |
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