Development of athermal ε-martensite in atomized Co-Cr-Mo-C implant alloy powders
Development of athermal ε-martensite in atomized Co-Cr-Mo-C implant alloy powders
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DOI：
10.1016/j.actbio.2006.04.003
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发表时间：
2006-11-01
影响因子：
9.7
通讯作者：
Lopez, H. F.
中科院分区：
文献类型：
--
作者：
Song, C. B.;Park, H. B.;Lopez, H. F.
Co-Cr-Mo雾化粉末，含0.05重量% C在高于900 ° C的温度下烧结1小时，然后快速冷却至室温。结果，产生了不同量的非热ε-马氏体，其随着烧结温度的增加而增加（从30体积%在950摄氏度至70体积%在1250 ℃下）。显然，由于高密度的E形核位点缺陷的发展，通过增加烧结温度强烈促进ε-胚的发展。此外，在这些粉末中容易形成非热马氏体，表明其发展强烈地受到碳过饱和水平从0.25重量%对于大多数商业合金，至0.05重量% C.ε-马氏体的量是在常规合金中发现的量的3-4倍，这表明粉末结构为非热ε-马氏体提供了增加的成核位点。显然，自由表面和晶粒发展在粉末接触表面结合再结晶和晶粒生长的粉末颗粒内导致有利的位错组态阵列的发展ε-胚胎。(c)2006 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
Co-Cr-Mo atomized powders containing 0.05 wt.% C were sintered at temperatures above 900 degrees C for I h and then rapidly cooled to room temperature. As a result, various amounts of athermal epsilon-martensite were produced which increased with increasing sintering temperatures (from 30 vol.% at 950 degrees C to 70 vol.% at 1250 degrees C). Apparently, the development of epsilon-embryos was strongly promoted by increasing sintering temperatures due to the development of a high density of E-nucleation site defects. In addition, athermal martensite readily formed in these powders, suggesting that its development was strongly favored by a significant reduction in the carbon supersaturation levels from 0.25 wt.% for most commercial alloys to 0.05 wt.% C. The amounts of epsilon-martensite were 3-4-fold those found in conventional alloys, suggesting that the powder structure provides increasing nucleation sites for athermal epsilon-martensite. Apparently free surfaces and grain development at powder contact surfaces combined with recrystallization and grain growth within powder particles lead to favorable dislocation configuration arrays for the development of epsilon-embryos. (c) 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.