Failure Reason and Protection Countermeasures on Liquid Metal Induced Embrittlement of 770 MPa Grade Quenched and Tempered Steel Casting
The causes of cracks in a large cross-section cast steel workpiece were analyzed using metallographic microscopy,electron scanning microscopy,and other methods.The results show that during the hot-dip galvanizing process of high-strength quenched and tempered cast steel,cracks perpendicular to the surface were generated in the matrix,with a crack length of about 3 mm,and the cracks cracked along the grain.The energy spectrum results indicated that the cracks contained a large amount of zinc,which was a typical liquid metal embrittlement phenomenon.In response to this situation,protective measures were proposed to avoid liquid metal embrittlement through hot-dip galvanizing process,welding process,forming process,coating system and other aspects.
liquid metal induced embrittlementquenched and tempered steel castinghot dip galvanizingintergranular crack
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