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本文采用慢拉伸、扫描电镜和离子探针等综合研究了30CrMnSiNi2A超高强度钢中拉伸白点的形成过程。结果表明:拉伸白点是钢在形变过程中形成的氢损伤,并对应一定的临界形变量ε_0~c。在等氢含量([H]=5.0cm~3/100g)和等应变速率(ε=3×10~(-5)/s)下,回火马氏体组织的ε_0~c=4.0％,下贝氏体组织的ε_0~c=5.0％。拉伸白点显微特征是氢脆的准解理断裂形态,白点表面的氢含量比基体的高。
In this paper, the slow stretch, scanning electron microscopy and ion-probe comprehensive study of the 30CrMnSiNi2A ultra-high strength steel in the formation of white point stretching. The results show that the tensile white point is the hydrogen damage formed during the deformation of steel, and corresponds to a certain critical deformation ε_0 ~ c. Ε_0 ~ c = 4.0% of tempered martensite at constant hydrogen content ([H] = 5.0cm ~ 3 / 100g) and constant strain rate (ε = 3 × 10-5 / s) Lower bainite ε_0 ~ c = 5.0%. The microscopic characteristics of the stretched white spots are hydrogen embrittlement and quasi-cleavage fracture morphology, and the hydrogen content of the white spots is higher than that of the substrate.