【摘要】 通过单向拉伸实验,研究了304不锈钢在不同应变量及不同应变速率下的马氏体含量与力学性能之间的关系.结果表明:在室温下,当应变速率为3×10-3s-1时,该材料的屈服强度和抗拉强度分别为220及1 260MPa,延伸率为57%,变形后样品中的马氏体体积分数为55%;当应变速率增加到3×10-1s-1时,虽然该材料的屈服强度增至370MPa,但是抗拉强度下降至1 000MPa,延伸率则下降至42%,变形后样品中的马氏体体积分数下降至21%.上述结果说明,该304不锈钢的塑性变形能力与其中的马氏体体积分数密切相关,应变诱导马氏体相变是该钢种的主要变形机制.更多还原

【Abstract】 The relationship between the martensite content and the mechanical property of 304 stainless steel was investigated through uniaxial tensile tests by changing strain rate.When the strain rate increased from 3×10-3 s-1 to 3×10-1 s-1 at the room temperature,the yield strength increased from 220 to 370 MPa,while the tensile strength and ductility decreased from 1 260 to 1 000 MPa and from 57% to 42%,respectively.While the volume fraction of sample martensite dropped from 55% to 21%.The results indicate that the steel’s plasticity is closely related to the martensite content,suggesting that the dominant deformation mechanism of the 304 stainless steel can be attributed to strain-induced martensitic transformation.更多还原