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首页> 美国政府科技报告 >Continuous-Cooling-Transformation Behavior, Microstructure, and Properties of0.02C-3.5Ni-3.6Mo High-Strength Steels
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Continuous-Cooling-Transformation Behavior, Microstructure, and Properties of0.02C-3.5Ni-3.6Mo High-Strength Steels

机译：0.02C-3.5Ni-3.6mo高强度钢的连续冷却转变行为，微观结构和性能

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摘要

The continuous-cooling-transformation (CCT) behavior, microstructures, andproperties of 0.02% C, 3.6% Mo, and 3.5% Ni steels with manganese contents ranging from 1 to 1.76% were investigated. The effects of cooling rate and prior austenite grain size were examined as part of the CCT work for the steel with 1.5% Mn. The CCT diagram for this steel is flat-topped, with almost no variation in the transformation start and finish temperatures as a function of cooling rate. A fully martensitic microstructure forms in response to cooling rates faster than about 37 deg C/s for a prior austenite grain size of about 7 micrometer. At cooling rates faster than 25 deg C/s, martensite forms for the 1.5% Mn steel with a prior austenite grain size of about 34 micrometer. At cooling rates slower than 25 deg C/s and 7 deg C/s for the prior austenite grain sizes of about 7 micrometer and 34 micrometer, respectively, the microstructure consists of acicular ferrite with micronsized islands of martensite and austenite.

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