摘要
以Fe901、Ti、B_4C和h-BN粉为原料,采用反应等离子熔覆方法在Q235钢基本上原位合成了含钛陶瓷相增强Fe基合金熔覆层。研究表明:相比B_4C,Fe更易与h-BN反应形成铁硼化物,当同时添加B_4C和h-BN时,B_4C/h-BN比减小至一定值后将导致熔覆层中Fe B含量升高和Ti_2N、Ti B等中间产物形成,但却可抑制陶瓷相长大。熔覆层显微组织均具有梯度分布特征,Ti B_2大小和形态受熔池温度和成分影响。熔覆层显微硬度随h-BN添加量增加而降低,Ti:B_4C:BN摩尔比为3:1:0时熔覆层近表面层HV_(0.2)显微硬度可高达11.26 GPa。
The Fe-based alloy coatings reinforced with in situ synthesized ceramic phases containing titanium were prepared on Q235 steel by a reactive plasma cladding process using Fe901, Ti, B4C and h-BN powders as raw materials. The results show that Fe is apt to react with h-BN to produce Fe B comparing with B4C. When both of B4C and h-BN are added as reactants, the B4C/h-BN ratio decreases to a certain value; as a result, the content of FeB increases and the Ti2N and Ti B intermediates occur in the coatings. However, it can depress the growth of ceramic phases. The microstructure of the clad coatings exhibits an obvious gradient distribution along the depth direction. The size and morphology of TiB2 change with the temperature and composition of the molten pool. Increasing h-BN amount results in the decrease of microhardness of the coatings. The high HV0.2 microhardness value 11.26 GPa can be achieved in the layer near the surface for the coating at Ti：B4C：h-BN=3：1：0.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2016年第9期2342-2346,共5页
Rare Metal Materials and Engineering
基金
江苏省自然科学基金(BK2011250)
江苏省博士后科学基金(1101017C)
中国博士后科学基金(20100481079)
