Abstract
AbstractThis paper studies the effect of two post‐weld heat treatment processes on the fatigue behaviour of an electron beam weldment in 9 mm AISI 4130 steel. Electron beam tempering, in a vacuum chamber, immediately after welding and a traditional furnace tempering treatment were compared. Fatigue crack propagation resistance was assessed by a linear elastic fracture mechanics analysis. The resistance to fatigue crack growth was improved with post weld heat treatment due to residual stress relief and the existence of a toughened tempered microstructure. The specimens with an electron beam post‐weld heat treatment showed better fatigue properties than those of furnace‐treated specimens. An electron beam post‐weld heat treatment causes the fatigue crack growth rate to decrease with increasing energy input and decreasing micro‐dot‐pattern width. For a furnace post‐weld heat treatment, the fatigue crack growth rate decreases with increasing tempering temperature.
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