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Numerical simulation of microstructure on laser transformation hardening on inner wall of 42CrMo pump barrel
HAN Bin, ZHANG Zhe, WANG Yong, WANG Nan-nan
(College of Electromeckftnkal Engineering in China Univemity of Petroleum, Qingdao 266580, China)
Abstract:
A 3-D finite element model was established for the numerical simulation of laser transformation hardening on tlie inner wall of pump barrel through a finite element code-SYSWELD, The change of thermal mechanical parameters with temperature was considered during the simulation. The melallurgy transformation was predicted by coupling phase evolution model with tlie results of temperature field. The hardness distribution was predicted using the simulation results of metallurgy transformation. The results show that laser transformation hardening is a fast heating and cooling process. During heating, the mi-crostrueture of laser heated zone is transformed to austenile which changes into martensite during cooling. After treatment, martensite could be achieved as a main phase in the hardened zone wilh a volume fraction of about 90%. The hardness of hardened zone is three timtfs as thal of base metal and ihe maximum value could reach 540. 6 HV0 2. The predicted microstructure and hardness of the hardened zone agree well with the experimental results.
Key words:  inner wall of pump bairel  laser Iransfoimation hardening  numerical simulation  microstructure evolution