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淬火態(tài)45號鋼在等通道角擠壓過程中晶粒演化
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    摘要:

    將馬氏體相變與強塑性變形工藝相耦合,,開發(fā)了基于等通道角擠壓快速制備亞微米級中碳鋼工藝,。試驗采用45號鋼,,就淬火態(tài)在不同回火溫度和回火時間條件下進(jìn)行擠壓,。試驗結(jié)果表明,,由馬氏體相變得到的過飽和鐵素體為動態(tài)再結(jié)晶和應(yīng)變誘導(dǎo)碳化物析出作了能量和組織準(zhǔn)備,,并在一定的回火溫度下進(jìn)行等通道角擠壓使位錯密度快速增加,,實現(xiàn)了動態(tài)再結(jié)晶,,形成了細(xì)小晶粒,,同時應(yīng)變誘導(dǎo)碳化物從過飽和的鐵素體中以彌散形式析出,,使亞微米鐵素體基體上均勻分布著細(xì)小碳化物。這種組織結(jié)構(gòu)具有較高的穩(wěn)定性,,在550℃退火30 min后,,晶粒尺寸仍保持在

    Abstract:

    1 μm以內(nèi)。A technique coupled martensite transformation with severe plastic deformation (SPD) has been developed for rapid producing submicron grain medium carbon steel based on equal channel angular pressing (ECAP). Experiments were conduced on medium-carbon steel,,and quenched steel was pressed at different tempering temperatures and time. The results indicted that the homogeneous supersaturated ferrites by martensite transformation was prepared for dynamic recrystallization and strain induced carbide precipitation, accumulated higher dislocation density in the crystal structure during ECAP at given tempering temperature urged to recrystallize and induced carbide particles to precipitate in dispersed phase. Homogeneous ultra-fined grain ferrites with fine carbide particles distributed grain boundaries could be achieved. These submicron microstructures possessed thermal stability and they remained grain size of less than 1 μm after annealing at 550℃ for 30 min. 

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汪建敏,陸晉,姜銀方,周孔亢,許曉靜.淬火態(tài)45號鋼在等通道角擠壓過程中晶粒演化[J].農(nóng)業(yè)機械學(xué)報,2007,38(12):185-189.[J]. Transactions of the Chinese Society for Agricultural Machinery,2007,38(12):185-189.

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