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首页> 外文会议>AIST steel properties amp; applications conference proceedings combined with MSamp;T' 10 materials science and technology 2010 >A Review of the Physical and Mechanical Properties of a Cast High-strength and Lightweight Fe-Mn-Al-C Steel
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A Review of the Physical and Mechanical Properties of a Cast High-strength and Lightweight Fe-Mn-Al-C Steel

机译：高强度轻质铸造Fe-Mn-Al-C钢的物理和力学性能综述

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摘要

Lightweight, age-hardenable steels in the Fe-Mn-Al-C system are currently being developed as an alternative to quenched and tempered steels. At a composition of Fe-30Mn-9Al-lSi-0.9C-0.5Mo, all compositions in weight percent, these alloys are almost 15% less dense than traditional steels and are completely austenitic when solution treated above 950℃. Recent research has focused on variations of this base composition and this paper serves as a compilation of the associated mechanical and physical properties of mostly cast materials. In the solution treated condition, lightweight steels have high work hardening rates and excellent ductility with elongations up to 64%. Tensile strength depends on the degree of age-hardening with cast tensile strengths greater than 1,000 MPa and wrought strengths as high as 1,160 MPa. In the aged condition, high strain rate compression tests have recorded yield strengths at 1,334 MPa with work hardening to ultimate strengths of 1,650 MPa. Notch toughness in these steels is mainly a function of the amount of phosphorus, inclusion content, and age-hardening. First principles calculations show that phosphorus substitutes for aluminum in the K-carbide structure and lowers the cleavage energy by 45%. However, with proper steelmaking practice and elimination of phosphorus to levels below 0.006%, this alloy attains Charpy 'V' notch (CVN) breaking energies of 39 J at -40℃ and room temperature dynamic fracture toughness values of up to 420 kJ/m~2 in the aged condition. Measured physical properties such as thermal conductivity and thermal expansion were close to those reported for high manganese austenitic steels. The modulus of elasticity was measured in hot rolled plate and found to increase slightly from 156 to 161 MPa with increased aging time.
机译：目前正在开发Fe-Mn-Al-C系统中的轻质，可时效硬化的钢，以替代淬火和回火钢。在Fe-30Mn-9Al-1Si-0.9C-0.5Mo的成分下，所有成分均以重量百分比计，这些合金的密度几乎比传统钢低15％，并且在950℃以上固溶处理时完全为奥氏体。最近的研究集中在这种基本成分的变化上，本文主要是对大多数铸造材料的相关机械和物理性能进行了汇总。在固溶处理条件下，轻质钢具有较高的加工硬化率和出色的延展性，延伸率高达64％。拉伸强度取决于时效硬化程度，铸件拉伸强度大于1,000 MPa，锻造强度高达1,160 MPa。在时效条件下，高应变率压缩试验记录的屈服强度为1,334 MPa，加工硬化至极限强度为1,650 MPa。这些钢的缺口韧性主要是磷含量，夹杂物含量和时效硬化的函数。第一性原理计算表明，磷可替代K-碳化物结构中的铝，并将裂解能降低45％。但是，通过适当的炼钢实践和将磷清除至低于0.006％的水平，该合金在-40℃时可获得39 J的夏比'V'缺口（CVN）断裂能，室温下的动态断裂韧性值高达420 kJ / m 〜2在老化的情况下。测得的物理性能，如热导率和热膨胀率，与报道的高锰奥氏体钢接近。在热轧板中测量弹性模量，发现随着老化时间的增加，弹性模量从156 MPa略有增加。

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