摘要:
塑性诱导相变钢(TRIP钢)微观组织由铁素体、马氏体和残余奥氏体组成的具有较高强度和良好塑性的优质钢板。为了研究连续冷却条件下过冷奥氏体的转变规律,测定了试验钢的连续冷却转变曲线(CCT曲线),研究了冷却速度对显微组织和硬度的影响。结果表明,相变区域包括A→P转变区、A→B转变区和A→M转变区。当冷却速度提高到2℃/s时,不仅出现A→P转变,而且伴随有A→B转变。当冷却速度提高到3℃/s,仅有A→B转变。当冷却速度提高到10℃/s,出现A→M转变。根据实验室研究结果,进行了工业试制,成品态的屈服强度、抗拉强度、伸长率A50和n值分别为535 MPa、815 MPa、29.5%和0.25,力学性能满足TRIP780要求。
Abstract:
The microstructure of transformation induced plasticity steel(TRIP) is composed by ferrite,martensite and retained austenite, and have high qualified steel plate with high strength and good plastici-ty.To study super-cooled austenite transformation under the condition of continuous cooling,the determi-nation of continuous cooling transformation curve had been done, and the influence of cooling rate on mi-crostructure and hardness had been investigated.The results showed that the phase transition area included A to P transition zone, and A to B transition zone and A to M transition zone.When the cooling rate was increased to 2℃/s,both A to P transformation and A to B transformation occurred.When the cooling rate was increased to 3℃/s,only A to B transformation took place.When the cooling rate was increased to 10℃/s,A to M transformation occurred.Based on the experimental results,the industrial production have been done and achieved satisfied TRIP 780 strip where the yield strength,tensile strength and elongation A50 and n value were 535 MPa,815 MPa,29.5% and 0.25,respectively.
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