Study On The ImplantEquipment Of Reheat Cracking Test

On the basis of the principles and structures of the cold cracking implant testing machine,the study on the implant equipment of reheat cracking test is reviewed in this paper.Reheat cracking implant test can be realized when the mechanical loading cold cracking implant testing machine is a little refixed.The heating system, temperature measuring system, cooling system should be fixed and the butterfly spring in the buffer of the loading system should be changed, when the cold cracking implant testing machine is changed to be reheat cracking implant testing machine. The heating oven is used as heating system, the temperature system includes thermocouple, electron potential difference instrument, temperature automatic instrument and transformer. Firstly, the fixture of the previous implant testing machine should be changed to be water-cooling fixture in the cooling system, and the water-cooling plate should be added on the base of electric oven. What are changed in the loading system is that: the butterfly spring in the buffer is repaced with a steel sleeve with the similar inner-outer diameter and length .This reequipment is simple,convenient and economical;meanwhile, it can simulate the actual situation and meet technology requirement of the test study. In order to verify the feasibility of using the reheat implant testing equipment, the reheat cracking test of the high strength low alloy steel-14MnMoNbB is assessed and the content of reheat cracking susceptibility evaluation is same with the study of the home and abroad;namely, this steel has the incline of the reheat cracking ,which provide us with good dependability.