Apparent morphology and nature of butterfly martensite

作者：Ma, Yue-Xin^*; Zeng, De-Chang; Dong, Xi-Chun

来源：Transactions of Materials and Heat Treatment, 2012, 33(1): 141-145.

• Habit plane
• High carbon alloy steel
• Matensite
• Multi morphologies
• Optical microscopes
• Phase transformation
• Plate martensite
• Plate matensite
• Single plates

Three kinds of high carbon alloy steels were made by solid carburizing, and the multi-morphology of butterfly martensite were studied by means of optical microscope, scanning electron microscopy(SEM) and transmission electron microscopy(TEM), and the substructure and nature of butterfly martensite was explored. The results show that a single plate of matensite can be formed by modes of multi-nucleation and associated nucleation. The phase transformation of coarse plate matensite, for which the habit planes are {111}r, {225}r and{259}r, proceeds in accordance with one of the nucleation ways mentioned above. The butterfly martensite is formed by the associated nucleation transformation, thus it is a kind of plate matensite in nature. The work of nucleation and nucleus growth of plate martensite by associated nucleation transformation is smaller than that by multi-nucleation transformation. After stopping growth of a coarse plate of matensite, it may continue to carry on transformation through many branches to growth from one side of the coarse plate matensite, as well as to growth by associated nucleation transformation, forming butterfly martensite. The angles of 30°, 45°, 60°, 90° and 135° between the two wings of butterfly martensite are observed, and no twinning angle(70° 32′) is found.

• 出版日期2012-1
• 单位华南理工大学