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Influence of austenitizing temperature on the Microstructure and Corrosion Resistance of 55Cr18Mo1VN High-Nitrogen Plastic Mould Steel

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Acta Metallurgica Sinica(English Letters) 2016年第12期29卷 1148-1160页

作者： Hua-Bing Li Wei-Chao Jiao Hao Feng Zhou-Hua Jiang Cui-Dong Ren School of Metallurgy Northeastern University Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education) Northeastern University

The influence of austenitizing temperature on the microstructure and corrosion resistance of 55Cr18MolVN high-nitrogen plastic mould steel was investigated. The microstructure, elemental distribution and Cr-depleted zone of different heat-treated samples were investigated by X-ray diffraction, electron probe microanalyzer analysis, and trans- mission electron microscopy. The corrosion resistance was evaluated using electrochemical measurements, and the analysis of passive film was carded out by X-ray photoelectron spectroscopy. The results indicated that the volume fraction of precipitates decreased, and the homogeneity of elements was improved with increasing austenitizing temperature. The degree of Cr-depleted zone around coarse M23C6 was severer than that around M2N, and pitting corrosion initiated preferentially around M23C6. The corrosion resistance of the samples increased with the austenitizing temperature. With the increase in austenitizing temperature, the passive film was thickened and Cr（III）cr2O3 in the inner layer of passive film was enriched, which enhanced the corrosion resistance of the steel. The higher content of nitrogen in solid solution at higher austenitizing temperature contributed to the increased intensity of CrN and NH3, leading to the increase in pH value in the pit, and promoting the repassivation of 55Cr18Mo1N steel.

关键词： High-nitrogen plastic mould steel austenitizing temperature Microstructure Corrosion resistance Cr-depleted zone

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Reheating austenitizing temperature of Spring Steel 60Si2MnA for Railway

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Journal of Iron and Steel Research International 2008年第6期15卷 62-67页

作者： CUI Juan LIU Ya-zheng PAN Hui GAO. Li-feng School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Technology Center Xingtai Iron and Steel Co Ltd Xingtai 054027 Hehei China Quality Control Department Xingtai Iron and Steel Co Ltd Xingtai 054027 Hebei China

The microsturctural transformation of austenite grain, pearlite interlamellar spacing, and lamellar cement ite thickness of spring steel 60Si2MnA for railway were studied in the hot-rolled and reheated states. Furthermore, the effect of microstructural characterization on its final mechanical properties was discussed. The results showed that as far as 60Si2MnA, the pearlite interlamellar spacing determined the hardness, whereas, the austenite grain determined the toughness. Compared with microstructure and mechanical properties in the hot rolled state, after reheating treatment at 950 ℃, its average grain sizes are apparently fine and the pearlite interlamellar spacing and lamellar cementite thickness coarsen to some extent, but both hardness and impact toughness increase to HRC 48 and 8.5 J, respectively. In the course of making spring, the optimum reheating austenitizing temperature for the 60Si2MnA steel is 950 ℃.

关键词： austenitizing temperature austenite grain pearlite interlamellar spacing hardness toughness

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INFLUENCE OF austenitizing temperature ON IMPURITY SEGREGATION ALONG GRAIN BOUNDARIES IN STEEL 4330M

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Acta Metallurgica Sinica(English Letters) 1991年第3期4卷 218-220页

作者： SHI Qunxing Luoyang Ship Material Research Institute,Luoyang,ChinaWU Jiansheng LIN Dongliang Shanghai Jiaotong University,Shanghai,China

The effect of austenitizing temperature on segregation of impurities along grain boundaries in steel 4330M has been examined by *** impurity segregation was computed *** showed that the quantity of impurity segregation changed with the austenitizing *** limitation of the McLean′s expression for equilibrium segrega- tion was discussed.

关键词： steel 4330M impurity segregation sulphur austenitizing temperature

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