改良オースフォームを適用したＳＣＭ４４０鋼の高サイクル疲労特性　第１報　　１６００ＭＰａ級焼入れ焼戻し材と改良オースフォーム材の疲労特性

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  • High-Cycle Fatigue Properties of Modified-Ausformed SCM440 Steels. 1st Report. Fatigue Properties of 1600MPa-Class Quenched and Tempered Steels and Modified-Ausformed and Tempered Steels.
  • カイリョウ オースフォーム オ テキヨウ シタ SCM440 コウ ノ コウサイクル ヒロウ トクセイ ダイ1ポウ 1600MPaキュウ ヤキイレ ヤキモドシ ザイ ト カイリョウ オースフォームザイ ノ ヒロウ トクセイ

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Modified-ausforming have been proved effective for improvement of high-cycle fatigue properties in high strength steels. Three SCM 440 steels (heats B, C and D) with the tensile strength of 1600 MPa were supplied for fatigue tests. The heat D included larger Al2O3 inclusions than heats B and C. Heat B was ausformed and induction tempered, whereas heats C and D were normally quenched and furnace tempered. AFM microstructure observation showed that martensite blocks and carbides of the ausformed heat B were smaller than those of normally quenched heats C and D. Fatigue limits at 108 cycles were 890 MPa for ausformed heat B and 840 and 750 MPa for quenched heat C and D. Fish-eye type fracture, which occurred in the quenched heats, disappeared in ausformed heat B. Origins of fish-eye type fracture were TiN inclusions in quenched heat C and Al2O3 inclusions in quenched heat D. Large and clear ODA, i.e. optically dark area, was observed on the fracture surface around the Al2O3 inclusion. On the other hand, ODA around the TiN inclusion was obscure. The fact that fish-eye type fracture disappeared and a higher fatigue limit was achieved in the ausformed heat B have shown the good performance of ausforming in fatigue properties of high strength steels.

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