鋼の靱性におよぼす溶融塩浸漬法による炭化物被覆の影響
1986 年 72 巻 8 号 p. 1198-1205
詳細
1986 年 72 巻 8 号 p. 1198-1205
Various steels were carbide-coated by immersing in a molten borax bath. Dynamic and static bending tests were made with these specimens in order to clarify the effects of kinds of carbide layers and substrate steels, layer thicknesses and tempering temperatures on their rupture strengths and crack formations in carbide layers.
(1) In dynamic bending, the absorbed energy for rupture of carbide coated steels are almost the same as those of hardened steels.
(2) In static bending, the following three cases were observed. If substrate steels were qrittle, rupture load and strain were not decreased by carbide coating, because the substrate steels ruptured at smaller load and strain than those for cracks generating in the carbide layer. If the substrate steels were tough, the rupture load and strain were not decreased, because cracks generated in the carbide layer did not induce substrate cracks. If the substrate steels had medium toughness, the rupture strength and strain decreased, because cracking in the carbide layer induced substrate cracks.
