Study On The Integration Of Boronizing And Quench For Enhance Wear Resistance Of The Excavator Bucket

Excavator in the construction machinery is one of the important construction equipment.The excavator bucket suffers great wear and tear in the working process due to its direct contactwith the material. Nowadays, the major ways of improving the wearing resistance of the bucketare to weld the high manganese steel or wear-resistant steel or built-up weld some wearablematerial. Welding the high manganese mainly takes its advantage of impact hardening, but whenthe bucket is under low-stress abrasion, it fails and the wear resistance can not be improved. Onthe other hand, welding wear-resistant steel or built-up welding some wearable material yetrequies high cost and complicated technology. Bornonizing technology is considered an effectiveway to improve wear resistance of the suface materials. Since the application to the excavator isstill blank at present, it is of practical value to study bornonizing technology to enhance wearresistance of the excavator bucket.Based on the bucket body material Q345steel, the paper, first of all, tells the experimentalstudy of the technology of boronization eletuary heat treatment. Then it focuses on theprocessing technology of the infiltration quenching integration on Q345steel. Last, it exploresthe wear resistance of Q345steel after the integration. And the key is to solve the techinalproblem of infiltration quenching integration on Q345steel.The main results of this study are as follows.Firstly, the optimum program of infiltration quenching integration on Q345steel is asfollows: the thickness of the boronizing paste6mm, the boronizing temperature960℃, the time7h. and the optimum program of B-RE reminder infiltration is that the boronizing termperaturesis at920℃, the time7h and the rare earth is2%.Secondly, the alloying layer under the condition of rare-earth catalysis which doesn’t getloose or holes, is denser than the ordinary one. The boronization level thickness also increases by10%. The X-ray diffraction shows that the boronizing layer by the rare-earth elements consistsof Fe2B. The hardness of boronizing layer is about8times of the matrix, which results in theremarkable improvement of the brittleness of the alloying layer. Not only did it have the targetachieved, but make it possible to open up a new techniccal approach to infiltration quenchingintegration.Under the condition of infiltration quenching intergration, Q345steel will strenghthen thelayer and the matrix strength will have a twice increase, which will also enhance the supportingrole of the matrix on the alloying layer. Besides, there are no crackes or other defects on the alloying layer by rare-earth elements, while it does on the ordinary alloying layer.The wear test shows that under the condition of infiltration quenching integration the wearresistance of Q345steel, which is8.29, the highest of all, is5.7times than the one of22SiMn2steel after quenching treatment.The innovations of the study can be concluded as following: adopting boronizationtechnology to improve the wear resistance of the excavator bucket, adding rare-earth which canimprove layer brittle ductile remarkably to the original boronization electuary, defining thenominal thickness of the boronizing layer and the error between the actual one being in theallowable range, and combining boronizing and quenching so as to strenghthen the layer andimprove the matrix strength as well.The findings of the research provide technical approaches and theoretical basis for theimprovement of wear resistance of the excavator bucket and will function in actual production.