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Long cast austenitic stainless steel after heat aging performance of the organization and

Author: ZhangLinLin
Tutor: LiuJiangNan
School: Xi'an University of Technology
Course: Materials Physics and Chemistry
Keywords: Steel Casting Z3CN20-09M Thermal aging Hardness Spinodal decomposition Ductile - brittle transition temperature Fracture mechanism
CLC: TG142.71
Type: Master's thesis
Year: 2011
Downloads: 112
Quote: 0
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Abstract


Cast austenitic stainless steel as a loop PWR primary coolant pipe , valve and the cooling pump pressure boundary components with the main structural material in the reactor coolant operating temperature (288-327 ℃) under long-term work , its performance will be generate degraded , if serious degradation will affect the primary circuit pressure boundary integrity and safe operation of nuclear power plants . Therefore, the study cast austenitic stainless steel thermal aging mechanism has a crucial importance . This paper systematically analyzes the domestic static casting Z3CN20-09M austenitic stainless steel after long service macroscopic mechanical properties and microstructure , summed up the performance and organizations throughout the aging process variation , and on this basis to heat aging to study the mechanism . In this paper, casting Z3CN20-09M thermal aging behavior of austenitic stainless steel has been studied , the main work in the following four aspects: First, analyze the steel foundry Z3CN20-09M experienced after thermal aging of microstructure morphology ; its a Rockwell hardness and Vickers hardness testing , hardness variation obtained . Second, through the static tensile tests and notch impact test to obtain material toughening performance ; and using t test statistics mechanical properties of the obtained data were evaluated in order to identify the impact of material toughening performance degradation factors ; after Description strain hardening index significance in the tensile deformation is obtained based on the variation . Third , to borrow SEM material tensile and impact fracture fracture surface , including macro -and micro- fracture fracture , obtained by analyzing the summary casting Z3CN20-09M steel thermal aging of fracture mechanism . Fourth , the use of transmission electron microscopy steel casting Z3CN20-09M micro- observation , and with the sub- structure of short-term thermal aging compared to summarize the material after thermal aging long sub-structure changes ; mechanical properties combined with the findings , come to thermal aging mechanism . Finally, the long service life of pipelines by predicting the performance after the value of the pipeline service life recommendations.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallic materials > Steel > Special performance of steels > Stainless steel, acid-resistant steel
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