Transactions of Materials and Heat Treatment

Title：Analysis and control of forging cracks for 12Cr2Mo1 large ingots

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ClassificationCode：TG316

year,vol(issue):pagenumber：2021,46(10):49-55

Abstract：

12Cr2Mo1 large ingots often crack during the forging production process, which has a great impact on the forging production process and the quality of forgings. A large number of spherical particles were observed in the fracture of crack specimen through test analysis. It was identified as inclusion by energy spectrum analysis. Metallographic samples were prepared to observe the distribution of inclusions and the microstructure in the crack area. A large number of small inclusions were found along the crack line. At the same time, it was found that the grain in the area near the crack line was smaller than that in the normal area. The reason was that the small inclusions were pinned on the grain boundaries and hindered the growth of the grains in the crack area under the forging high temperature state, resulting in a mixed crystal phenomenon. In addition, there were a lot of ferrite in the area near the crack line due to decarburization, and the crack propagation was easier in the forging process. Through scanning electron microscopy and energy spectrum analysis, the fact that the inclusions in the crack area on the metallographic sample and the inclusions in the fracture were both MnO-Cr2O3 composite inclusions had been further confirmed. Combining the analysis results, the control measures for inclusions and harmful elements were formulated, and through the research and analysis of the high temperature strength and plasticity of 12Cr2Mo1 large ingots, the crack sensitive temperature range of the material was determined.

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作者简介：宋玉冰（1972-），男，学士，高级工程师 E-mail：sybclf@126.com 通信作者：陈明（1985-），男，学士，工程师 E-mail：chenming123citic@163.com

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