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    H13大規(guī)格芯棒斷裂失效原因分析

    Analysis of Causes for Fracture Failure of H13 Large Size Mandrel

    • 摘要: 觀察Φ460 mm PQF連軋管機組H13大規(guī)格芯棒的宏觀斷裂形貌，分析其力學(xué)性能及顯微組織，找出H13大規(guī)格芯棒斷裂的原因。分析認為：H13芯棒在徑向各位置的液析碳化物數(shù)量均較多，形狀多呈長條狀，且多個液析碳化物聚集呈鏈狀分布，使材料韌性降低，造成芯棒斷裂。

       

      Abstract: The causes for fracture of H13 large size mandrel are found out by observing the macromorphology of the fracture of a large size mandrel of a Φ460 mm PQF mandrel mill and analyzing the mandrel's mechanical properties and microstructure.The analysis indicates that there are quite a lot of liquation carbides on different radial positions.The liquation carbides are generally in strip shape and some of the aggregated ones are distributed in chain structure, so the toughness of the material is lowered and causes the mandrel to fracture.

       

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