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Characteristics of embrittlement in Weather Resistant Steel in Austenite and γ-Ferrite Temperature Range

Characteristics of Embrittlement in Weather Resistant Steel ...

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第六届材料与热加工物理模拟及数值模拟国际会议

作者： Xingjian Gao a Dengfu Chen b Liwei Song Hui Hu Xinglei Yang Guan Wang Zhenyu Zhou College of Materials Science and Engineering Chongqing University Chongqing 400030 China

The embrittlement of particular weather resistant steel has been investigated by thermal-tensile tests using a Gleeble-1500D system at temperatures range from 600 to 1300℃ and at a strain rate of 10-3/*** specimen was reheated and cooled to the test temperature before the tensile deformation in order to get the mechanical properties subject to the continuous casting *** make clear the plastic flow behavior in Austenite and γ-Ferrite temperature range of the weather resistant steel,the tensile tests were performed and the results indicate that the stress-strain curves as a function of temperature and with the temperature increased the stress became less,while the hot ductility changed significantly due to the work hardening and *** of the strength indices （including yield strength,tensile strength and fracture strength） of the steel increased gradually with decreasing temperature,except for small fluctuations during the γ→α transformation *** emphases were placed on the hot ductility to clarify the sensitivity of surface cracking during unbending operation and the embrittlement zone occurred in the temperature range between 750 and 1050℃,in which the minimum %R of A was around 22% at 850 ℃.In the embrittlement zone,the specimens were fractured with little plastic deformation by either grain boundary sliding or by localization of strain in the film proeutectoid ferrite produced by the γ→α transformation.

关键词： Weather Resistant Steel embrittlement zone Stress-Strain Analysis Hot Ductility Fracture Surface

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