Ｃｒ‐Ｎｉ‐Ｍｏ‐Ａｌ‐Ｔｉマルエージング鋼のＴＲＩＰ挙動に関する実験的考察　　背応力と変態開始条件の同定

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  • An Experimental Study of TRIP Behavior in a Cr-Ni-Mo-Al-Ti Maraging Steel. Identification of Back Stress and Transformation Condition.
  • Cr Ni Mo Al Ti マルエージング コウ ノ TRIP キョドウ ニ カンスル ジッケンテキ コウサツ ハイ オウリョク ト ヘンタイ カイシ ジョウケン ノ ドウテイ
  • Identification of Back Stress and Transformation Condition
  • 背応力と変態開始条件の同定

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The deformation and transformation behavior of a maraging TRIP (TRansformation Induced Plasticity) steel (MAVAL X12) is studied experimentally. The stress holding test under cooling and the strain-controlled isothermal loading test are performed with the thin-walled tubular specimens in order to get the dilatation curves under a constant hold stress and the stress-strain curves. The existence of the back stress is confirmed since the dilatation curves do not close after a heating/cooling thermal cycle. Its value in the axial direction is determined to be 28.4MPa by means of the dilatation curves under applied hold stresses. The transformation-start condition is identified to be a linear Clausius-Clapeyron line both under tensile/compressive and shear stresses. The temperature-dependence of the yield stress determined by means of the tension, compression and torsion tests is charactered by the following: In the higher temperature range the measured values mean the yield stress of the parent phase, whereas in the low temperature range they exhibit the “composite effect, ” since the microstructure is consisted of the hard thermally-and stress-induced martensite phase and the soft parent phase. In the middle temperature range the measurement shows the result of the competition of both effects.

収録刊行物

  • 材料

    材料 50 (3), 243-248, 2001

    公益社団法人 日本材料学会

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