Cause Analysis of Fracture in Bending Test of SWRH67B-1 Nail
The alloy cold heading steel wire rod SWRH67B-1 was drawn and processed into shooting nail,and the batch fracture occurred during the bending test.The physical and chemical tests of the nail shooting samples fractured by bending test were carried out,such as macroscopic inspection,metallographic examination,scanning electron microscope and ener-gy spectrum analysis.the results show that hydrogen permeation occurs in the processing process.The existence of large granular inclusions near the surface and core of the material aggravates the local accumulation of hydrogen,which leads to hydrogen-induced brittle fracture in the bending test process.
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