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Q345B和AH32連鑄板坯不同部位的高溫延塑性

High temperature ductility of Q345B and AH32 continuous casting slabs at different positions

  • 摘要: 通過Gleeble-1500熱模擬試驗機,分別對取自同一塊Q345B鋼板坯的橫向、縱向、豎向和中心四個方位的試樣和AH32鋼板坯表面及其厚度1/4處的六組不同部位的縱向試樣進行了高溫延塑性的研究.采用了金相顯微鏡和掃描電鏡方法對斷口和附近的組織進行了觀察.研究結果發現:Q345B鋼板坯四個方位的試樣低溫區域(950℃以下)高溫延塑性曲線變化較小,而高溫區域(950℃以上)的延塑性曲線變化相對較大.AH32鋼板坯表面的三組縱向試樣的高溫延塑性曲線變化規律相同,斷面收縮率沒有出現特別大的波動;而厚度1/4處的三組試樣的高溫延塑性曲線與表面的三組試樣差異較大,斷面收縮率發生了很大波動,其原因主要是試樣位于發達的柱狀晶區,較表面的等軸晶區更容易出現微裂紋、元素的偏析、鑄坯組織疏松等缺陷.

     

    Abstract: The high temperature ductility of samples, taking from a Q345B continuous casting slab in the transverse direction, drawing direction, vertical direction and at the central part, as well as an AH32 continuous casting slab at the surface and 1/4 thickness position, was investigated by using a Gleeble-1500 testing machine. The fractographs and microstructures of high-temperature tensile samples were observed by optical microscopy and scanning electron microscopy. Experimental results show that the high temperature ductility below 950℃ changes little between 4 groups of different samples from the Q345B slab, but the variation tendencies of high temperature ductility above 950℃ are greatly different. The changes of high temperature ductility of 3 groups of samples from the AH32 slab at the surface are the same, and the reduction of area has little fluctuation. Whereas the high temperature ductility of 3 groups of samples at the 1/4 thickness differs entirely from that at the surface, and the reduction of area appears fluctuant greatly. The reason is that microcracks, composition segregation, porosity and looseness occur more easily in the columnar crystal zone of sampling than in the equiaxed crystal zone of the surface.

     

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