本文通过对Q 3 4 5d钢加入微量合金元素V并进行控轧控冷试验。
This paper carries out controlled rolling and controlled cooling test by means of adding microalloy element V to Q345D steel.
结果表明，微量合金元素硼改变了裂纹扩展途径和扩展方式，从而降低了疲劳裂纹扩展速率。
Result show that the trace boron additive causes the changes in the mode of fatigue crack propagation and its route, so that crack growth rate of 40MnB is lowered.
本文采用正交设计法系统地研究了微量合金元素对18 - 8型不锈钢铸态耐蚀性能的影响。
Influences of trace alloy elements on the corrosion properties of as-cast 18-8 stainless steel have been studied in detail by orthogonal design experiments.
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