254SMO相析出规律及其性能的研究
发布时间：2018-12-11 02:47
【摘要】：作为6%Mo的超级奥氏体不锈钢,254SM0具有优异的耐腐蚀性能,广泛地应用于高氯离子环境。254SM0较高的合金元素含量,特别是高的Mo含量,在赋予其优异耐蚀性能的同时,也导致有害析出相易于产生,材料容易发生高温氧化,难于热加工。 本文主要采用力学试验方法、微观组织分析、Gleeble热模拟、特定环境的腐蚀分析等方法对254SMO的相析出行为及其对力学、耐蚀性能、热变形行为的影响,以及抗氧化性能进行了研究,并对其机理进行探讨,推荐了254SM0最佳的热处理和热加工工艺参数。为国内254SMO及其他超级奥氏体不锈钢的研究和下一代超级奥氏体的开发提供了一定的数据和理论支持。本文主要研究结果和结论为： 1、254SMO(?)出相的类型较为复杂,Mo含量均较高,其主要的析出相为σ相和χ相,也含有少量的其他相,如M23C6, Cr2N, Laves相等；σ相和χ相的最高析出温度分别达到了1150。C和1050℃。通过应力松弛方法获得了σ相和χ相的析出曲线,它们对应的析出峰分别为975。C和875。C。 2、有害相的析出对254SMOI的性能影响显著,它们将显著降低材料的塑韧性及耐蚀性能。1150℃和1100℃沉淀的大块析出相,对应力腐蚀性能的影响明显；当固溶处理温度达到1200℃左右时,254SMO具有较好的组织、力学和耐蚀性能。 3、254SMO的最佳热塑性温度区间较窄,约为1200-1250。C；其热变形过程软化方式为动态再结晶,动态再结晶机制为晶界迁移形核方式,动态再结晶激活能为508.7kJ,同时计算了254SM0的热压缩变形方程。 4、254SMO(?)氧化性能较差,且对温度敏感性强。材料高温生成的氧化物主要为Mo氧化物,其次是Fe304人Fe203型氧化物；其中,Mo氧化物是导致材料抗氧化性能差的主要原因,而Fe203型氧化物在1050。C和1100℃的高温分解促使氧化加剧。
[Abstract]:As a super austenitic stainless steel of 6%Mo, 254SM0 has excellent corrosion resistance and is widely used in high chloride ion environment. The higher content of alloying elements, especially the high content of Mo, gives 254SM0 excellent corrosion resistance. It also leads to the formation of harmful precipitates, the high temperature oxidation of materials and the difficulty of hot working. In this paper, mechanical test method, microstructure analysis, Gleeble thermal simulation, corrosion analysis of specific environment and other methods are used to analyze the precipitation behavior of 254SMO phase and its influence on mechanical, corrosion resistance and thermal deformation behavior. The oxidation resistance was studied and the mechanism was discussed. The best parameters of heat treatment and hot working for 254SM0 were recommended. It provides some data and theoretical support for the research of 254SMO and other super austenitic stainless steels and the development of the next generation super austenite. The main results and conclusions of this paper are as follows: 1254SMO (?) The main precipitated phases are 蟽 phase and 蠂 phase, and there are a few other phases, such as M23C6, Cr2N, Laves are equal, the highest precipitation temperature of 蟽 phase and 蠂 phase is 1 150.C and 1050 鈩，
本文编号：2371716
[Abstract]:As a super austenitic stainless steel of 6%Mo, 254SM0 has excellent corrosion resistance and is widely used in high chloride ion environment. The higher content of alloying elements, especially the high content of Mo, gives 254SM0 excellent corrosion resistance. It also leads to the formation of harmful precipitates, the high temperature oxidation of materials and the difficulty of hot working. In this paper, mechanical test method, microstructure analysis, Gleeble thermal simulation, corrosion analysis of specific environment and other methods are used to analyze the precipitation behavior of 254SMO phase and its influence on mechanical, corrosion resistance and thermal deformation behavior. The oxidation resistance was studied and the mechanism was discussed. The best parameters of heat treatment and hot working for 254SM0 were recommended. It provides some data and theoretical support for the research of 254SMO and other super austenitic stainless steels and the development of the next generation super austenite. The main results and conclusions of this paper are as follows: 1254SMO (?) The main precipitated phases are 蟽 phase and 蠂 phase, and there are a few other phases, such as M23C6, Cr2N, Laves are equal, the highest precipitation temperature of 蟽 phase and 蠂 phase is 1 150.C and 1050 鈩，
本文编号：2371716
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