崔大伟,魏文庆,刘炳强,曲选辉

• 1:潍坊学院机电工程学院
• 2:北京科技大学材料科学与工程学院

摘要(Abstract)：

采用机械合金化和高压气雾化两种工艺分别合成了近球形粉末,随后通过粉末注射成形技术制备了0Cr17Mn11Mo3N高氮奥氏体钢材料。用X射线衍射、扫描电镜、拉伸试验等手段研究了粉末和块状材料的结构及性能。结果表明:两种粉末球形度好,颗粒细小,装载量和烧结活性较高,都能够较好满足后续粉末注射成形工艺要求。机械合金化粉末最佳致密化条件是采用真空脱氧+氮气烧结方式,在0.1 MPa氮气压力下于1260℃烧结120 min,烧结体相对密度97.90%,氮含量1.02 mass%,经过1150℃×90 min固溶处理后屈服强度、抗拉强度、伸长率、断面收缩率、维氏硬度分别高达627 MPa、965 MPa、11.3%、16.7%、312HV;高压气雾化粉末最佳致密化条件为0.1 MPa氮气压力下1300℃烧结120 min,烧结体相对密度98.33%,氮含量0.78mass%,经固溶处理后屈服强度、抗拉强度、伸长率、断面收缩率、维氏硬度也分别达到580 MPa、885 MPa、26.0%、29.1%、222HV。由于氮在奥氏体中的强化作用,0Cr17Mn11Mo3N高氮奥氏体钢的强度、硬度等远高于传统注射成形316L奥氏体不锈钢。

关键词(KeyWords)： 高氮奥氏体钢;机械合金化;气雾化;粉末;致密化

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(51004077);; 山东省优秀中青年科学家科研奖励基金(BS2010CL046)

作者(Author): 崔大伟,魏文庆,刘炳强,曲选辉

DOI: 10.13289/j.issn.1009-6264.2013.12.008

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