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Characterization of the Bake-hardening Behavior of Transformation Induced Plasticity and Dual-phase Steels Using Advanced Analytical Techniques

机译:使用先进的分析技术表征相变诱导塑性和双相钢的烘烤硬化行为

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摘要

The bake-hardening (BH) behavior of TRansformation Induced Plasticity (TRIP) and Dual-Phase (DP) steels after intercritical annealing (IA) has been studied using transmission electron microscopy, X-ray diffraction and three dimensional atom probe tomography. It was found for the DP steel that carbon can segregate to dislocations in the ferrite plastic deformation zones where there is a high dislocation density around the "as-quenched" martensite. The carbon pinning of these dislocations, in turn, increases the yield strength after aging. It was shown that bake-hardening also leads to rearrangement of carbon in the martensite leading to the formation of rod-like low temperature carbides in the DP steel. Segregation of carbon to microtwins in retained austenite of the TRIP steel was also evident. These factors, in combination with the dislocation rearrangement in ferrite through the formation of cells and microbands in the TRIP steel after pre-straining, lead to the different bake-hardening responses of the two steels.
机译:使用透射电子显微镜,X射线衍射和三维原子探针层析成像技术研究了临界退火(IA)后的相变诱导塑性(TRIP)和双相(DP)钢的烘烤硬化(BH)行为。对于DP钢,发现碳可以在铁素体塑性变形区中偏析到位错,在“淬火”马氏体周围有高位错密度。这些位错的碳钉扎反过来增加了时效后的屈服强度。结果表明,烘烤硬化还会导致马氏体中碳的重排,从而导致DP钢中形成棒状低温碳化物。在TRIP钢的残余奥氏体中,碳也偏向微孪晶。这些因素,加上预应变后在TRIP钢中通过形成晶胞和微带而在铁素体中进行位错重排,导致两种钢的烘烤硬化反应不同。

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