硼化物粒子分散強化Co基肉盛金属のすべり摩耗性

概要

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In order to improve sliding wear characteristics at high temperature, the overlay weld metals for Co-based alloys with various amount of MoB particles were prepared using a plasma transferred arc welding process. Effects of amount of MoB particles on wear behaviors and friction coefficient of the overlay weld metals at high temperature were investigated using Ohgoshi wear tester and cylinder friction tester. The microstructures of overlay weld metals were consisted of Co-based matrix (βCo), lamellar structure of Cr_<23>C_6 and βCo, lamellar structure of M_2B and βCo and primary crystal of CoMo_2B_2. The volume fraction of CoMo_2B_2 and hardness of overlay weld metals increased with the increase in the additional boron quantity. When the values subtracting the hardness of overlay weld metals from the hardness of S45C carbon steel were above HV300,the sliding wear resistance at high temperature was extremely improved. The friction coefficient of the overlay weld metals decreased with the increase of the test temperature. The reason is that the boride prevented the adhesion of S45C carbon steel to the overlay weld metals.
社団法人溶接学会の論文
1998-05-05