高锰钢的加工硬化主要来自两个方面:一是大量的孪晶变形使全位错和不全位错在共格的孪晶界面上运动受阻,一是变形过程中产生大量Mn-C原子对或MV-CC(锰-空位碳-碳)原子团,造成强烈的不对称畸变。高锰钢变形时,滑移不断调整孪晶变形,产生应力弛豫,从而使其既具有高的硬化率又有良好塑性。
Work hardening of Hadfield manganese steel is mainly from twocauses: 1) a large amount of twinning makes perfect dislocal is or shockley dislo-cations to be blocked up at the coherent twin boundaries. 2) deformation leads tostrong unsymmetrical distortion due to a large number of Mn-C pairs or Mn-vaca-ncy carbon-carbon clusters. It has been demonstrated by TEM observation and in-ternal friction tests. As deformation proceeds, slip constantly accommodates twin-hing shear giving rise to stress relaxation. Thus, Hadfield steel possesses both rapidwork hardening and good ductility.
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