کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
768627 | 1462994 | 2013 | 13 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Research of 50Mn2V continuous casting slab transverse cracking during its retarded cooling process Research of 50Mn2V continuous casting slab transverse cracking during its retarded cooling process](/preview/png/768627.png)
In this paper, the reason of 50Mn2V transverse cracking is studied by optical metallographic, SEM and in situ analysis system. Results show that the pearlite is surrounded by the net-like pro-eutectoid ferrite which locates at the former austenite grain boundary, the hydrogen content (ca. 2 × 10−4 wt%) exceeds the critical solubility in room temperature structure, divers types and sizes inclusions (10–100 μm), plenty of fissures (2–50 μm) and classical cleavage fracture surface are obviously observed, meanwhile, a great degree of elements segregation (P, S, V, Ni, Cr correspond to 1.757, 1.674, 1.729, 1.475, 1.195, respectively) and a poorly 0.9283 integral density exist in this blank, high temperature thermoplastic experiment shows the ductility trough existing until the dynamic re-crystallization temperature range. From the above, internal gas pressure should be the dominant factor that leads the transverse embrittlement, while internal stresses, element segregation and defects play an ancillary role.
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► The pearlite is surrounded by the net-like pro-eutectoid ferrite which locates at the former austenite grain boundary.
► The hydrogen content (ca. 2 × 10−4 wt%) exceeds the critical solubility in room temperature structure.
► Divers types and sizes inclusions (10–100 μm), plenty of fissures (2–50 μm) and classical cleavage fracture surface are obviously observed.
► A great degree of elements segregation and a poorly 0.9283 integral density exist in this blank.
► Ductility trough exists below the dynamic re-crystallization temperature range.
Journal: Engineering Failure Analysis - Volume 30, June 2013, Pages 61–73