Bulk cementites with the Cr contents of 0, 301, 603, 822, and 1151 mass% were prepared by mechanical alloying (MA) and spark plasma sintering (SPS). The results indicated that when the Cr content was low (301 mass%), the phases were composed of cementite with a small amount of α-Fe at a sintering temperature of 1173 K, but the microstructure became single-phase alloyed cementite as the Cr content was further increased. It showed that micro-addition of Cr was beneficial for promoting the formation of cementite. Furthermore, the mechanical performance of cementite can be greatly affected by the variation of Cr content. The hardness, elastic modulus and elastic recovery presented a remarkably increasing tendency with the addition of Cr, and the maximum micro-hardness and elastic modulus values reached 107074 HV and 19932 GPa, respectively, which were similar to the precipitation phase (cementite) obtained by melting and casting techniques. Moreover, when the Cr content was below 1151 mass%, the crystal structure of Fe3C-type cementite would not change with increasing the Cr content. A Cr atom replaced an Fe atom in the lattice of the cementite, and voids appeared when Cr was doped into the cementite at content of about 1151 mass%, causing the relative density to decrease.
Abstract
Bulk cementites with the Cr contents of 0, 301, 603, 822, and 1151 mass% were prepared by mechanical alloying (MA) and spark plasma sintering (SPS). The results indicated that when the Cr content was low (301 mass%), the phases were composed of cementite with a small amount of α-Fe at a sintering temperature of 1173 K, but the microstructure became single-phase alloyed cementite as the Cr content was further increased. It showed that micro-addition of Cr was beneficial for promoting the formation of cementite. Furthermore, the mechanical performance of cementite can be greatly affected by the variation of Cr content. The hardness, elastic modulus and elastic recovery presented a remarkably increasing tendency with the addition of Cr, and the maximum micro-hardness and elastic modulus values reached 107074 HV and 19932 GPa, respectively, which were similar to the precipitation phase (cementite) obtained by melting and casting techniques. Moreover, when the Cr content was below 1151 mass%, the crystal structure of Fe3C-type cementite would not change with increasing the Cr content. A Cr atom replaced an Fe atom in the lattice of the cementite, and voids appeared when Cr was doped into the cementite at content of about 1151 mass%, causing the relative density to decrease.
关键词
Mechanical alloying /
Spark Plasma Sintering /
Single-phase Cementite /
Relative density
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Key words
Mechanical alloying /
Spark Plasma Sintering /
Single-phase Cementite /
Relative density
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铸造铁硼耐磨合金中Fe2B原子掺杂韧化及其抗磨料损伤行为
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