摘要
利用Ｎｄ：ＹＡＧ脉冲激光在不锈钢表层合金化ＳｉＯ２纳米颗粒，在熔池最表层１４μｍ深度范围内形成Ｓｉ合金化区域，Ｓｉ含量呈非均匀分布特征．表层为非晶相与奥氏体的双相组织，非晶相弥散分布并呈现特殊的环状形貌，中心为非晶，外侧为纳米尺度的超细柱晶及等轴晶．分析了非晶形成机制。
The coating was produced by alloying SiO2 nano-particles on the surface of an austenite stainless steel using pulsed Nd: YAG laser. It was observed that silicon-alloyed regions with an uneven distribution of Si element exist within the depth of 14 μm of the surface. The coating consists of a duplex microstructure, i.e., the fine and disperse amorphous phase distributed homogeneously in austenite. The amorphous phase has an unusual ring-shaped structure. The inner area is the amorphous phase whereas the margin area is a mixture of columnar and equiaxed crystals. The stoichiometry of the amorphous phase is (FeNiCrTi)l00-.Six., where x ranges from 18.5% to 32.6% (mass fraction). The mechanism of the amorphous formation is attributed to an increase in the amorphous formation ability by the addition of silicon.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2000年第10期1041-1044,共4页
Acta Metallurgica Sinica
基金
国家自然科学基金!19891180
国家杰出青年科学基金!19525205
中国科学院基金!KJ951-1-201
