大锻件微孔隙下的氢压模型及其应力场
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摘要
基于氢压理论与Griffith理论,通过分析大锻件内微孔隙的来源,建立了大锻件微孔隙在氢压下的有限元分析模型。通过数值模拟,对不同形态下的微孔隙在氢压下的应力场进行了对比分析,结果表明大锻件内原始孔洞萌生白点的可能性极小,但随着孔洞变形量的增大,在垂直于孔洞压下变形主方向的平面上,白点萌生的可能性大大提高。此外,片状裂纹上最大张应力所处的位置表明,氢压下不规则裂纹有向圆形扩展的趋势,这就解释了为何在锻件截面上观察到的白点多为圆形或椭圆形。研究结果为大锻件白点萌生的力学研究奠定了理论基础。
Based on the hydrogen pressure theory and Griffith theory,the finite element analysis model of micropore under hydrogen pressure is proposed by analyzing the source of micropore in heavy forging.Through numerical simulation,the hydrogen pressure stress field of micropore with different forms is discussed.The simulation results show that the flake initiation is very unlikely to occur around the original void in heavy forging.However,on the plane perpendicular to the void deformation direction,the flake initiation possibility increases with the expanding of void deformation.In addition,the maximum tensile stress location of the sheet crack indicates the expanding trend from irregular crack to round crack,which demonstrates the phenomenon that most of the flakes observed are round or oval on the forging section.The results provide a theoretical basis for the mechanical research on flake initiation in heavy forging.
引文
[1]康大韬.大型锻件材料与热处理[M].北京:龙门书局,1998:106―108.Kang Datao.Heavy forgings material and heating[M].Beijing:Longmen Press,1998:106―108.(in Chinese)
    [2]Oriaui R A,Josephic P H.Equilibrium and kineticstudies of the hydrogen-assisted cracking of steel[J].Acta Metallurgica,1977,25:979―988.
    [3]Zapffe C A,Sims C E.Hydrogen,flakes and shattercracks[J].Metals and Alloys,1940,5:145―151.
    [4]Petch N J,Stables P.Delayed fracture of metal understatic load[J].Nature,1952,169:842―843.
    [5]崔振山,徐秉业.圆柱体内部空洞热锻闭合过程的数值模拟[J].塑性工程学报,2002,9(1):49―52.Cui Zhenshan,Xu Bingye.Numerical simulation of poreclosure in solid cylinder under hot forging[J].Journal ofPlasticity Engineering,2002,9(1):49―52.(in Chinese)
    [6]Park C Y,Yang D Y.A study of void crushing in largeforgings:II.Estimation of bonding efficiency by finiteelement analysis[J].Journal of Materials ProcessingTechnology,1997,72(1):32―41.
    [7]Hodge J M,Orehoski M A,Steiner J E.Effect ofhydrogen content on susceptibility of flaking[J].TransAIME,1964,1230:1182―1193.
    [8]李明,范益,赵亚娟.钢中白点特征及形成机理的研究[J].南钢科技与管理,2009,1(2):20―23.Li Ming,Fan Yi,Zhao Yajuan.Research oncharacteristic and forming mechanism of flake cracks insteel[J].Nansteel Science Technology and Management,2009,1(2):20―23.(in Chinese)
    [9]白广成,翟书研.锻件材产生白点的原因分析[J].特钢技术,2010,16(63):10―12.Bai Guangcheng,Zhai Shuyan.Analysis on formation ofwhite spots in forging[J].Special Steel Technology,2010,16(63):10―12.(in Chinese)
    [10]庞钧,吴景之.大型锻件缺陷分析图谱[M].北京:机械工业出版社,1990:191―207.Pang Jun,Wu Jingzhi.Heavy forging defect analysismap[M].Beijing:China Machine Press,1990:191―207.(in Chinese)
    [11]劳恩B R,威尔肖T R.脆性固体断裂力学[M].北京:地震出版社,1985:5―14.Lawn B R,Wilshaw T R.Fracture of brittle solids[M].Beijing:Seismological Press,1985:5―14.(in Chinese)
    [12]Shewmon P G.Hydrogen attack of carbon steel[J].Metallurgical and Materials Transactions A,1976,7:279―286.
    [13]斯克柳耶夫ПВ.大型锻件中的氢和白点[M].北京:机械工业出版社,1966:57―76.СклюевПВ.Hydrogen and flakes in heavy forging[M].Beijing:China Machine Press,1966:57―76.(inChinese)
    [14]黄华贵,杜凤山,臧新良.大型零件M锻造法及其孔洞缺陷锻合过程的数值模拟[J].锻压技术,2005,增刊:34―37.Huang Huagui,Du Fengshan,Zang Xinliang.Numericalsimulation of bulk ingot upsetting and void fault closingwith M method[J].Forging&Stamping Technology,2005,Supplement:34―37.(in Chinese)
    [15]李永华,檀雯,张宁.锻件内部孔洞闭合的研究[J].沈阳理工大学学报,2008,27(6):64―67.Li Yonghua,Tan Wen,Zhang Ning.Research on voidclosure in the forging[J].Transactions of ShenyangLigong University,2008,27(6):64―67.(in Chinese)

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