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本文提出氮化层所能承受的极限塑性应变是一个开裂的判据。通过对氮化的弯曲试样进行近似的应变分析,得到参量“2(m+2)((Δ_(PC)·h)/S~2),可用来表征用声发射测量的氮化层脆性,为筛选和发展氮化新工艺提供了评定的依据。四种氮化钢的声发射试验初步验证了这一尝试。在所研究的离子氮化工艺范围内,其氮化层脆性增长顺序是:40Cr、20CrMnTi、35CrMnSi、38CrMoAl。
This paper proposes that the ultimate plastic strain that a nitride layer can withstand is a criterion for cracking. The parameter ”2 (m + 2) ((Δ_ (PC) · h) / S ~ 2 is obtained by approximate strain analysis of the nitrided bent specimen, which can be used to characterize the nitride layer measured by acoustic emission Brittleness, which provided a basis for the screening and development of a new nitriding process.The experiment of four kinds of nitrided steel acoustically verified this experiment.The order of increasing brittleness of nitride layer in the range of ion nitriding process studied Is: 40Cr, 20CrMnTi, 35CrMnSi, 38CrMoAl.