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金属学报  1998, Vol. 34 Issue (10): 1033-1038    
  论文 本期目录 | 过刊浏览 |
激光熔覆Fe—Cr—W—Ni—C合金的微观组织及其演化
武晓雷;陈光南
中国科学院力学研究所;北京;100080;中国科学院力学研究所;北京;100080
MICROSTRUCTRUAL CHARACTERIZATION AND EVOLUTION OF LASER CLAD Fe-BASED ALLOYS
WU Xiaolei; CHEN Guangnan(Institute of Mechanics; The Chinese Academy of Sciences; Beijing 100080)Correspondent: WU Xiaolei;Tel:(010)62547527; Fax: (010) 62561284; E-mail:xlwu@cc5.imech.ac.cn
引用本文:

武晓雷;陈光南. 激光熔覆Fe—Cr—W—Ni—C合金的微观组织及其演化[J]. 金属学报, 1998, 34(10): 1033-1038.
, . MICROSTRUCTRUAL CHARACTERIZATION AND EVOLUTION OF LASER CLAD Fe-BASED ALLOYS[J]. Acta Metall Sin, 1998, 34(10): 1033-1038.

全文: PDF(3289 KB)  
摘要: 用SEM,ATEM及化学分析、显微硬度测定等手段,对激光溶覆Fe—Cr—W—Ni—C(其质量比为10:5:1:1:1)合金的微观组织进行了研究,结果表明,该合金经激光溶覆后可得到亚共晶和过共晶两类熔覆组织分别为γ+(γ+M7C3)及M7C3+(γ+M7C3),存在领先相的竞争与选择.γ为亚稳奥氏体,具有较高的合金元素过饱和含量;M7C3(M=Cr,Fe,W等)为Cr基合金碳化物,存在层片状、蜂窝状、网状及鲱骨状等多种生长形态.经923K,2h高温时效,发生了γ→M23C6及M2C均匀析出与M7C3→M23C6及M7C3→M6C原位转变.细小弥散的M2C及M6C的析出及形成是造成熔覆组织二次硬化的原因.
关键词 激光熔覆显微结构Fe-Cr-W-Ni-C合金    
Abstract:In site synthesis of high toughness wear resistance coating alloy Fe-Cr-W-Ni-C(mass ratio are 10: 5: 1: 1: 1) by laser cladding was investigated by SEM and ATEM.Hypo-and hyper-eutectic microstructures, i.e., γ+(γ+M7C3) and M7C3+(γ+M7C3) are obtained while there are competition and selection of the primary phase. The γ-austenite ismetastabe phase with extended solid solution of alloying elements and a great deal of struc structures. There appear various morphologies of eutectic carbide, such as lamellar, honeycomb,herringbone, and network. During high temperature aging, the precipitation of M23C6 and M2Ccarbides from austenite and in site transformations of M7C3 →M23C6 and M7C3 → M6C areobserved in hypo-and hyper-eutectic ndcrostructures respectively. Based on the experimentalresults, transformation mechanism during rapid solidification and thermal aging are proposed.Two microstructures have evidently secondary hardening and the corresponding peak temperatures and peak microhardnesses (HV0.2) are 923 K, 1050 and 963 K, 1250 respectively.
Key wordslaser cladding    microstructure    alloy Fe-Cr-W-Ni-C
收稿日期: 1998-10-18     
基金资助:中国科学院重大项目!KY951-A1-601-03;;中国博士后研究基金!4868
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