EFFECTS OF VOLUME FRACTION AND STABILITY OF RETAINED AUSTENITE ON DUCTILITY OF TRIP-AIDED DUAL-PHASE STEELS
EFFECTS OF VOLUME FRACTION AND STABILITY OF RETAINED AUSTENITE ON DUCTILITY OF TRIP-AIDED DUAL-PHASE STEELS
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DOI：
10.2355/isijinternational.32.1311
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发表时间：
1992-01-01
影响因子：
1.8
通讯作者：
HASHIMOTO, S
中科院分区：
文献类型：
--
作者：
SUGIMOTO, K;USUI, N;HASHIMOTO, S
研究了硅和锰含量对0.2C-（1.0- 2.5）Si-（1.0 - 2.5）Mn（质量%）TRIP双相钢中残余奥氏体颗粒体积分数和稳定性的影响。此外，通过对残余奥氏体应变诱发相变行为的研究，探讨了上述残余奥氏体参数与室温和中温塑性的关系，结果表明，除2.5mass %锰钢外，随着硅、锰含量的增加，残余奥氏体初始体积分数增加，残余奥氏体中碳含量降低。发现这些钢的延展性在23 - 175 ℃之间的给定温度下达到最大，即，最高温度得出的结论是，峰值温度与残余奥氏体的应变诱导转变被适度抑制的温度一致。此外，峰值温度Tp（℃）与残余奥氏体的估计马氏体开始温度Ms（℃）相关，为Tp = 3.04Ms + 187。强度-延展性平衡，即，峰值温度下的抗拉强度与总延伸率的乘积随残余奥氏体初始体积分数的增加而线性增加。
The effects of silicon and manganese contents on volume fraction and stability of retained austenite particles in 0.2C-(1.0-2.5)Si-(1.0-2.5)Mn (mass%) TRIP-aided dual-phase steels were investigated. In addition, the relationships between above retained austenite parameters and ductility at room and moderate temperatures were discussed through studies on strain-induced transformation behavior of retained austenite.As increasing the silicon and manganese contents except for 2.5 mass% manganese steel, the initial volume fraction of retained austenite increased with accompanied by reducing carbon concentration in retained austenite. It was found that the ductilities of these steels became maximum at a given temperature between 23 and 175-degrees-C, i.e., a peak temperature. The peak temperature was concluded to agree well with the temperature at which the strain-induced transformation of retained austenite was suppressed moderately for each steel. Moreover, the peak temperature Tp (degrees-C) was related to estimated martensite-start temperature Ms (degrees-C) of the retained austenite as Tp = 3.04Ms + 187. Strength-ductility balance, i.e., the product of tensile strength and total elongation, at the peak temperature linearly increased with an increase in the initial volume fraction of retained austenite.