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设计了一种低应力下容易发生ε马氏体转变的Fe-17Mn-6Si-0.3C高Si高Mn钢.采用OM,XRD和TEM研究了高Si高Mn钢和传统高Mn钢在静态拉伸和动态冲击时的力学性能及组织演化.结果表明:静态拉伸下高Si高Mn钢比传统高Mn钢具有更高的加工硬化速率;动态冲击下高Si高Mn钢的表面硬度高于传统高Mn钢,而冲击变形量却显著低于传统高Mn钢.高Si高Mn钢变形时应力诱发ε马氏体转变的优先发生是导致上述结果的原因,这个结果间接证实了传统高Mn钢的异常加工硬化能力来源于形变孪晶的形成及其因C原子存在导致的严重晶格畸变.
A Fe-17Mn-6Si-0.3C high-Si high-Mn steel with ε-martensite transformation under low stress was designed. The mechanical properties of high Si high Mn steel and conventional high- Tensile and dynamic impact of the mechanical properties and microstructure evolution.The results show that static tensile high Si high Mn steel has higher work hardening rate than the traditional high Mn steel; dynamic impact high Si high Mn steel surface hardness is higher than The conventional high Mn steel, but the impact deformation is significantly lower than the traditional high Mn steel.High Si Si high Mn steel deformation stress-induced ε martensitic transformation priority is the reason leading to the above results, this result indirectly confirmed the traditional high Mn The abnormal work hardening ability of steel comes from the formation of deformation twins and the serious lattice distortion caused by the existence of C atoms.