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首页> 外文期刊>Steel Research International >Dynamic Tensile Testing of Ultrahigh Strength Hot Stamped Martensitic Steels
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Dynamic Tensile Testing of Ultrahigh Strength Hot Stamped Martensitic Steels

机译：超高强度热冲压马氏体钢的动态拉伸试验

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摘要

Tensile testing over strain rates of 0.001, 1, 100, and 200 s(-1) is performed on three novel ultrahigh strength hot stamped martensitic steels, namely 38MnB5, 15MnCr5, and 25MnVB5, in addition to the conventional "boron steel" for automotive hot stamping technologies, 22MnB5. Each steel generally demonstrates positive strain rate sensitivity (increasing tensile strength) with increasing strain rate from 0.001 to 1 s(-1), but negative strain rate sensitivity (decreasing tensile strength) with increasing strain rate from 1 to 200 s(-1). The notable exception to the above is 38MnB5, which demonstrates consistently increasing ultimate tensile strength across all four strain rates. Moreover, each steel generally demonstrates maximum elongation at strain rates of 100 or 200 s(-1). The response of 38MnB5 to increasing strain rate gives rise to significantly higher modulus of toughness (energy absorption) compared to 22MnB5 at the higher strain rates. It is concluded that 38MnB5 should provide superior "anti-intrusive" crash performance under low-speed impact owing to significantly higher tensile strength, yet superior "impact energy absorptive" crash performance under high-speed impact owing to significantly higher modulus of toughness.
机译：除了用于汽车的传统“硼钢”之外，对三个新颖的超高强度热冲压马氏体钢，即38Mnb5，15mncr5和25mnvb5，对0.001,1，100和200秒（-1）的拉伸试验是在三个新的超高强度热冲压的马氏体钢中进行。热冲压技术，22mnb5。每根钢通常都显示出阳性应变速率敏感性（增加抗拉强度），随着0.001至1秒（-1）而增加，但负应变率灵敏度（减小拉伸强度），从1至200秒（-1）增加。上述显着的例外是38MnB5，其始终如一地增加了所有四个应变率的最终拉伸强度。此外，每个钢通常以100或200秒（-1）的应变率以最大伸长率展示。 38MnB5对应变率的响应产生明显更高的韧性模量（能量吸收），而较高的应变率为22mNB5。结论是，38MnB5应在低速冲击下提供优异的“反侵入性”碰撞性能，由于显着提高了抗拉强度，但由于显着更高的韧性模量显着增加，因此在高速冲击下具有优异的“冲击能源吸收”碰撞性能。

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