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316L不銹鋼激光快速成形過程中熔覆層的熱裂機(jī)理
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TF124.3

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國家重點(diǎn)基礎(chǔ)研究發(fā)展規(guī)劃(G2000067205-3)，國家高技術(shù)研究發(fā)展計(jì)劃(No.001AA703020)的資助項(xiàng)目


The Hot Cracking Mechanism of 316L Stainless Steel Cladding in Rapid Laser Forming Process
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    摘要:

    采用微觀測(cè)試分析方法，針對(duì)316L不銹鋼粉末，深入研究了激光快速成形過程中熔覆層的開裂行為及其形成機(jī)理，研究結(jié)果表明，316L不銹鋼激光熔覆層裂紋多發(fā)生在樹枝晶的晶界，呈現(xiàn)出典型的沿晶開裂特征，裂紋斷面上有明顯的氧化彩色，掃描電鏡照片顯示裂紋斷面上樹枝晶的方向與輪廓清晰可見，樹枝晶晶界相當(dāng)圓滑，表明裂紋是在高溫下產(chǎn)生的，熔覆層中的裂紋是凝固裂紋，屬于熱裂紋范疇，裂紋產(chǎn)生的主要原因是熔覆層組織在凝固溫度區(qū)間晶界處的殘余液相受到熔覆層中的拉伸應(yīng)力作用所導(dǎo)致的液膜分離的結(jié)果。

    Abstract:

    The forming mechanism for the crack produced in the process of laser forming 316L stainless steel powder alloy has been studied in the paper by micro measurements. The results show that the cladding cracks were formed in grain boundary with dendritic structure commonly and presented a characteristic of cracking along grains. There was obvious oxidation color on the fracture section of the cracks. SEM photos show that the orientation and profile of dendrite grains are distinct and the dendrites are rather round on the crack surface. All these show that the cracks were formed at high temperature. The crack formed in the cladding layers is the solidification crack, which belongs to the domain of hot crack, mainly due to the separation of the liquid films in the grain boundary under the action of tension stress existed in the cladding layers which was produced in RLF process.

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陳靜 林鑫 等.316L不銹鋼激光快速成形過程中熔覆層的熱裂機(jī)理[J].稀有金屬材料與工程,2003,(3):183~186.[Chen Jing, Lin Xin, Wang Tao, Yang Haiou, Huang Weidong. The Hot Cracking Mechanism of 316L Stainless Steel Cladding in Rapid Laser Forming Process[J]. Rare Metal Materials and Engineering,2003,(3):183~186.]
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  • 最后修改日期:2002-08-30
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