研究了３０ＭｎＣｒＮｉＭｏＢ低合金钢在穿甲弹冲击下绝热剪切带（ＡＳＢ）的形成机制。指出在高速变形（冲击）条件下ＡＳＢ的形成是应变硬化、热软化和位错动态发时导致的应变软化等因素相互耦合产生的塑性失稳现象。进一步确认ＡＳＢ内具有周期性微观结构，并说明ＡＳＢ中周期性开裂与微结构的关系。
The formation mechanism of adiabatic shear band(ASB) produced by high speed penetration in 30MnCrNiMoB low alloy steel was studied.During the deformation process.there are not only a thermal softening and the usual strain hardening,another strain softening due to the dynamic emission of dislocations from F-R(Frank-Read) sources should be considered.Experimental observations show that there is periodic structure along ASB,i.e.periodic crack branching along ASB and periodic arrangement of tear ledges on the crack surface along ASB trace.The physical mechanism of the periodic structure is discussed.
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