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Acta Metall Sin  1982, Vol. 18 Issue (5): 571-648    DOI:
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EFFECT OF Ni ON TEMPERING PROCESS OF MATRIX STEEL
Yu Xuejie; Guo Jiliang; Zhu Jiahua; Huang Jiaping (Shanghai Institute of Iron and Steel Research)
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Yu Xuejie; Guo Jiliang; Zhu Jiahua; Huang Jiaping (Shanghai Institute of Iron and Steel Research). EFFECT OF Ni ON TEMPERING PROCESS OF MATRIX STEEL. Acta Metall Sin, 1982, 18(5): 571-648.

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Abstract  The tempering behaviour of the matrix steel has been investigated by means of the hardness and strength measurements and TEM observation. It was found that the secondary hardening effect and the resistance to heat softening of the steel are markedly improved by addition of Niabout 1-2%. TEM observation showed that the Ni promotes precipitation of M_2C and transformation of (Fe,M)_3 C as well as fines the grains of V_4C_3 and M_2C. The addition of Ni stabilizes strongly the retained austenite under low temperature tempering. However, the Ni-containing steel tempered under temperature above 500℃ less exceeds Ni-free steel in amount of the retained austenite. The behaviour of increasing the retained austenite does not cover up the effect of strengthening the secondary hardening both by addition of Ni.
Received:  18 May 1982     
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