【摘要】：采用13%PAG(聚烷撐乙二醇)和油對60Si2Cr VAT彈簧鋼進(jìn)行淬火熱處理,研究了不同淬火冷卻速率對其軸向高周疲勞(r=-1)性能的影響。利用SEM、TEM和EBSD等方法對疲勞斷口形貌、源區(qū)成分、顯微組織進(jìn)行表征。結(jié)果表明,13%PAG淬火后的疲勞極限(781.5 MPa)比油淬高67.5 MPa(714.0 MPa)。疲勞斷口分析表明,疲勞破壞大部分起源于試樣內(nèi)部夾雜物和碳化物,形成"魚眼"型撕裂的粒狀亮區(qū)(GBF)。隨裂紋源夾雜物處應(yīng)力強(qiáng)度因子幅?Kinc的減小,疲勞壽命Nf增加,而GBF區(qū)邊界的應(yīng)力場強(qiáng)度因子幅?KGBF并不隨Nf變化而改變,且13%PAG淬火試樣的?KGBF大于油淬試樣。實驗鋼13%PAG淬火試樣組織中分布更多的納米孿晶;馬氏體板條塊和板條更加細(xì)化,碳化物呈均勻細(xì)小彌散分布;而油淬碳化物較粗大,沿馬氏體板條界和原奧氏體晶界分布。這些因素是PAG淬火后疲勞性能優(yōu)于油淬的主要原因。
[Abstract]:The effects of different quenching cooling rates on the axial fatigue (r=-1) properties of 60Si2Cr VAT spring steel were studied with 13%PAG (polyalkylene glycol) and oil. The fatigue fracture morphology, source region composition and microstructure were characterized by SEM, TEM and EBSD. The results showed that the fatigue limit after 13%PAG was 781.. 5 MPa) higher than oil quenched by 67.5 MPa (714 MPa). Fatigue fracture analysis showed that most of the fatigue failure originated from internal inclusions and carbides in the specimen, forming a "fish eye" type bright zone (GBF). The decrease of the stress intensity factor of the inclusions at the crack source, the increase of fatigue life Nf, and the amplitude of the stress field intensity factor of the GBF zone boundary stress field intensity factor KGBF It does not change with the change of Nf, and the 13%PAG quenching specimen is larger than the oil quenching specimen. More nanoscale twins are distributed in the microstructure of the experimental steel 13%PAG quenched; the martensitic plate strips and the slate are more refined, the carbides are uniformly dispersed, and the oil quenching carbides are larger, along the martensitic lath boundary and the original austenite grain boundary. The main reason is that the fatigue property of PAG is better than that of oil quenching after quenching.
【作者單位】： 貴州大學(xué)材料與冶金學(xué)院;貴州省材料結(jié)構(gòu)與強(qiáng)度重點實驗室;高性能金屬結(jié)構(gòu)材料與制造技術(shù)國家地方聯(lián)合工程實驗室;貴州大學(xué)機(jī)械工程學(xué)院;
【基金】：國家自然科學(xué)基金(51461006) 貴陽市科技支撐計劃項目筑科合同(2013101) 貴州省科技重大專項(20146012) 貴州省重大專項黔科合(JZ[2014]2003)~~
【分類號】：TG142.1;TG161

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