本文選題：EET　切入點(diǎn)：300M　出處：《遼寧工程技術(shù)大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：本文應(yīng)用“固體與分子經(jīng)驗(yàn)電子理論”(EET)計(jì)算研究了300M鋼的不同微觀組織特征相的電子結(jié)構(gòu)參數(shù)統(tǒng)計(jì)值,并計(jì)算了低溫回火狀態(tài)下300M鋼的力學(xué)性能,計(jì)算結(jié)果與實(shí)驗(yàn)值符合較好。計(jì)算研究了不同回火組織特征相界面電子結(jié)構(gòu)參數(shù)的最大值Δρmax、最小值Δρmin,研究發(fā)現(xiàn)最大值Δρmax、最小值Δρmin分別與相界面的最大、最小特征強(qiáng)度σ*max和σ*min相對(duì)應(yīng),原子狀態(tài)組數(shù)σ與界面穩(wěn)定性相對(duì)應(yīng)；研究結(jié)果表明：300M鋼中溫回火屈氏體組織的σ*min較大,可有效阻止裂紋的萌生,因此疲勞裂紋的孕育期N0較長(zhǎng)；同時(shí),中溫回火屈氏體組織的σ*max較大,裂紋在界面處擴(kuò)展受阻,裂紋的擴(kuò)展門(mén)檻值△Kth較大；原子狀態(tài)組數(shù)σ較大,循環(huán)載荷作用下界面的穩(wěn)定性愈不容易遭到破壞,界面越穩(wěn)定,因此循環(huán)周數(shù)N較高。中溫回火屈氏體組織中N0、ΔKth、N均出現(xiàn)峰值,因此疲勞性能最好。
[Abstract]:In this paper, the statistical values of electronic structure parameters of different microstructure characteristic phases of 300M steel have been calculated by using "solid and Molecular empirical Electron Theory", and the mechanical properties of 300M steel under low-tempering condition have been calculated. The calculated results are in good agreement with the experimental data. The maximum 螖 蟻 maxand the minimum 螖 蟻 min of the electronic structure parameters of different tempering microstructure characteristic phase interfaces are calculated and studied. It is found that the maximum 螖 蟻 maxand the minimum 螖 蟻 min are the maximum of the phase interface, respectively. The minimum characteristic strength 蟽 _ (max) corresponds to 蟽 _ (min), and the number of atomic state groups 蟽 _ (a) corresponds to the interfacial stability. The results show that 蟽 _ (min) of tempering and tempering at middle temperature is larger, which can effectively prevent the initiation of crack, so the incubation period of fatigue crack is longer. At the same time, the 蟽 max of the tempering body is larger, the crack propagation is blocked at the interface, the Kth of the crack growth threshold is larger, the number of atomic states 蟽 is larger, and the stability of the interface is less easily destroyed under cyclic loading. The more stable the interface, the higher the cycle number N and the peak value of N _ 0 and 螖 K _ (thn) in the tempering medium temperature, so the fatigue performance is the best.
【學(xué)位授予單位】：遼寧工程技術(shù)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TG142.1

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