EFFECTS OF VARIOUS HEAT TREATMENT PROCEDURES ON THE TOUGHNESS OF AISI 4140 LOW ALLOY STEEL

In this paper, through literature search, effects of various heat treatment procedures on toughness of commercially available AISI 4140 low alloy steel were investigated. Variables affecting a material’s mechanical properties were discussed briefly and details of AISI 4140 steel were delivered. Different heat-treating routes and approaches from various reports were considered and compared. Utilizing a materials properties database, a number of reported results were gathered and discussed. An effort has been put into keeping all the variables affecting the results constant other than heat treatment procedures for the purpose of observing only the effects of those procedures. Double quenching and tempering in the range of 600-900℃ as well as full annealing at around 860℃ were found to be resulting with the highest toughness values. A proposal was also made for furtherly improving the toughness values of these heat-treated samples.

Keywords:

Heat Treatment, Maximum Toughness AISI 4140 Steel,

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