Julong HE
,
Dongli YU
,
Ming ZHANG
,
Yongiun TIAN
,
Shizhen CHEN and Dongchun LI (Yanshan University
,
Qinhuangdao
,
066004
,
China)
材料科学技术（英文）
The liquid sintering characteristics have been studied in the sintered compacts of short cast iron fibers added with Ni-Cr based alloy powder at the sintering temperature of 1100℃. With the increase of Ni-Cr based alloy content, the microstructure of sintered compact of short cast iron fibers transformed from pearlite+ferrite to martensite+austenite, meanwhile volume expansion appeared in the sintered compact, leading to more pores. The proper addition of P-Fe powder could restrain the expansion of the sintered compact and increase the strength and hardness of the sintered compact.
关键词:
Ming ZHANG
金属学报(英文版)
In order to reveal evolution of the rust layer during atmospheric corrosion, commercial weathering steel (WS) 09CuPCrNi and a recently developed bainite WS were subjected to a salt fog test. The protection and compactness of the rust layer were evaluated by electrochemical analysis, absorption-desorption test, etc. The experimental results indicate that more compact rust layer could be derived from the rust particles with larger size. The well-established notion that the rust particle growth can induce the decrement of corrosion resistance of WS. However, the present investigation shows that the notion might not be universally accurate. The unusual result means that the rust particles might grow anisotropically during corrosion.
关键词:
Weathering steel
,
corrosion
,
rust particle
,
coarsening
