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| TEMPER BRITTLENESS OF P-DOPED STEELS 35CrMnSi AND 35CrNi3——Grain Boundary Segregation of P and Effect of La Addition |
| YANG Yishi (Baotou Research Institute of Metallurgy); ZOU Huiliang (Shanghai Institute of Metrology) |
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Cite this article:
YANG Yishi (Baotou Research Institute of Metallurgy); ZOU Huiliang (Shanghai Institute of Metrology). TEMPER BRITTLENESS OF P-DOPED STEELS 35CrMnSi AND 35CrNi3——Grain Boundary Segregation of P and Effect of La Addition. Acta Metall Sin, 1983, 19(2): 42-48.
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Abstract An Auger electron spectroscopical study was made of the correlation between the temper brittleness and the grain boundary segregation of P together with alloying elements as Ni, Cr and Mn in steels 35CrMnSi and 35CrNi3 containing 450 ppm P. It was shown that the steels tested attributed substantially their temper brittleness to the P segregation along the prior austenite grain boundaries. Although in so called "ductile state", namely oil quenched at 1200℃, tempered at 625℃ for 1h and water quenched, a lot of P segregated already along the grain boundary, thus, the steels embrittled markedly. After embrittlement treatment by step cooling, intergranular P concentration increased sharply. During this treatment, the increasing rate of P segregation along grain boundary in Ni-Cr steel is greater than that in Cr-Mn-Si steel. The FATT of the steels tested is directly proportional to the intergranular P content. The intergranular segregation of Ni in Ni-Cr steel is related linearly to that of P. To the steels, the addition of La may improve their temper embrittlement owing to decrease of intergranular P concentration under similar state.
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Received: 18 February 1983
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