Original scientific paper Production scheduling plays a vital role in the planning and operation of a manufacturing system. Better scheduling system has a significant impact on cost reduction and minimum work-in-process inventory. This work considers the problem of scheduling n/m/F/ΣCi using Decision Tree (DT) algorithm. Since this problem is known to be strongly NP-hard, this work proposes heuristic based methodology to solve it. The advantages of DT's are that the dispatching rule is in the form of If-then else rules which are easily understandable by the shop floor people. The proposed approach is tested on benchmark problems available in the literature and compared. The proposed work is a complement to the traditional methods.Keywords: decision tree algorithm and heuristics; flow shop scheduling; total flow time Na pravilu zasnovan heuristički pristup smanjenju ukupnog protoka vremena kod programiranja radova u permutacijskoj protočnoj radionici Izvorni znanstveni članak Programiranje radova u proizvodnji je od bitne važnosti u planiranju i funkcioniranju proizvodnog sustava. Unaprijeđeni sustav programiranja značajno utječe na smanjenje troškova i minimalni broj radnih postupaka. U ovom se radu razmatra problem programiranja n/m/F/ΣCi primjenom Decision Tree (DT) algoritma. Budući da je ovaj problem poznat kao veoma NP-hard, u radu se za njegovo rješenje predlaže metodologija temeljena na heuristici. Prednosti DT-a su u tome što je pravilo otpreme u obliku If-then else pravila koja radnici u radionici lako razumiju. Predloženi je pristup testiran na repernim problemima dostupnim u literaturi i uspoređen. Predloženi rad je dodatak tradicionalnim metodama.Ključne riječi: decision tree algoritam i heuristika; programiranje radova u protočnoj radionici; ukupni protok vremena

This work presents the investigation of a boriding process on two grades of stainless steel namely UNS32750 super duplex stainless steel and UNSS31803 duplex stainless steel in order to improve material properties and possibly to reduce catastrophic failure of industrial components. Usage of duplex stainless steels has become customary in the fields of oil and refinery, marine and pipeline applications due to increased corrosion resistance; however, these materials exhibit low wear characteristics. To overcome this problem, in this work the pack boriding process was employed. Evaluation of effects of the boriding process on the microstructure and mechanical properties was performed using scanning electron and optical microscopy, Vickers hardness tests and wear tests. It was shown that the 4 h process resulted in the greatest boriding layer thickness yielding the maximum surface hardness of 1407 HV in the super duplex stainless steel UNS32750 while this value was 1201 HV in the duplex stainless steel UNSS31803. Wear resistance of borided materials were up to 6-fold greater than those of non - treated materials. Also, the borided duplex materials were shown to be more suitable for industrial applications for valve and shaft components as compared to the boronized super duplex stainless steel.