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高氮钢材料组织及性能研究 被引量:11

Microstructure and properties of high nitrogen steel
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摘要 采用加压感应熔炼+模铸和热轧+水冷、轧后+固溶处理两种工艺,制备氮的质量分数为1.0%的高氮钢材料,对不同处理工艺下材料的微观组织、力学性能、耐腐蚀性能进行研究。结果表明,抗拉强度、屈服强度、屈强比差别不明显,但延伸率和断面收缩率在固溶处理后得到明显提高。经透射电镜电子衍射发现奥氏体组织中存在大量的孪晶、位错和层错;晶内、晶界有碳化物沉淀相析出,位错强化和第二相沉淀析出强化是提高高氮钢强度的主要原因。 The high nitrogen steel of 1.0% nitrogen content was prepared by two technological processes of pressurized induction melting, cooling after hot rolling and solution heat treatment after rolling. Microstructure, mechanical properties, and corrosion resistance of the materials were studied. The results show that the tensile strength, yield strength, and yield ratio have little difference for two kinds of processing. However, elongation and area reduction rates are improved after solution treatment. TEM analysis shows that the samples are composed of austenite. There are a lot of twins, dislocations and stacking faults in austenite structure as well as intregranular and intragranular carbide precipitates. Dislocation strengthening and precipitation strengthening of second phase result in the strength improvement of high nitrogen steel.
出处 《兵器材料科学与工程》 CAS CSCD 2010年第6期65-68,共4页 Ordnance Material Science and Engineering
关键词 高氮钢 力学性能 微观组织 固溶处理 high nitrogen steel mechanical properties microstructure solution heat treatment
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