高速度鋼射出成形体の焼結性および機械的特性に及ぼすBおよびAl_2O_3の微量添加の効果

概要

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It has been known that boron (B) is a very effective sintering enhancer for SKH51 steel powder. However, there were a problem that the enhancing effect of B was limited only when the SKH51 powder compacts were sintered in H2 atmosphere, where the hardness of the compacts was reduced due to the decarburization. In this study, we tried to obtain the sintered PIM SKH51 compacts with high densities and mechanical strengths by adding 0.2 mass% Al2O3 powder together with 0.4 mass% B powder to the SKH51 steel powder. The powder mixture was compacted by injection molded and sintered at 1448 K∼1493 K for 3 h in H2. It was shown that the PIM SKH51 steel compacts with Al2O3 and B powder were appreciably densified during sintering, compared with the compacts containing B powder, and the nearly theoretical density was obtained when they were sintered at 1458 K. Although the tensile strength of the sintered PIM compacts with Al2O3 and B powders slightly lowered compared with those containing B powder, the hardness of the PIM compacts was greatly improved by the addition of Al2O3 powder together with B. The hardness of the PIM compacts with Al2O3 and B reached to the values over Hv=1000.
社団法人粉体粉末冶金協会の論文
2005-01-15