The dynamic tensile behavior of tough, ultrahigh-strength steels at strain-rates from 0.0002 s-1 to 200 s-1

被引:96
作者
Boyce, B. L. [1 ]
Dilmore, M. F. [2 ]
机构
[1] Sandia Natl Labs, Mat Sci & Engn Ctr, Albuquerque, NM 87185 USA
[2] USAF, Res Lab, Damage Mech Branch, Eglin AFB, FL USA
关键词
Yield; Strength; Ductility; Steel; Strain-rate; DEFORMATION; TEMPERATURE;
D O I
10.1016/j.ijimpeng.2007.11.006
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
The present Study examines the strain-rate sensitivity Of four high-strength, high-toughness steels at strain-rates ranging from 0.0002 s(-1) to 200 s(-1): AerMet 100, modified 4340, modified HP9-4-20, and a recently developed Eglin AFB steel alloy, ES-1c. A newly developed dynamic servohydraulic method was employed to perform tensile tests over this entire range from quasi-static to near split-Hopkinson or Kolsky bar strain-rates. Each of these alloys exhibits only modest strain-rate sensitivity. Specifically, the semi-logarithmic strain-rate sensitivity factor beta Was found to be in the range of 14-20 MPa depending on the alloy. This corresponds to a similar to 10% increase in the yield strength over the 6-orders of magnitude change in strain-rate. Interestingly, while three of the alloys showed a concomitant similar to 3-10% drop in their ductility with increasing strain-rate, the ES-1c alloy actually exhibited a 25% increase in ductility with increasing strain-rate. Fractography suggests the possibility that at higher strain-rates ES-1c evolves towards a more ductile dimple fracture mode associated with microvoid coalescence. Published by Elsevier Ltd.
引用
收藏
页码:263 / 271
页数:9
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