23Co14Ni12Cr3MoE(A-100)鋼的研究進(jìn)展

23Co14Ni12Cr3MoE(A-100)鋼的研究進(jìn)展Topics on Applied Basic Theory Research of 23Co14Ni12Cr3MoE(A-100)Steel

從23Co14Ni12Cr3MoE（簡稱A-100）鋼開坯鍛造與基本力學(xué)性能的關(guān)系、材料熱工藝引起的晶粒度變化與基本力學(xué)性能的關(guān)系、二次硬化析出規(guī)律、疲勞性能等幾個方面闡述A-100鋼的基本特點。在300M鋼確立的多次鐓拔大鍛比開坯的基礎(chǔ)上，研究形成了高溫均質(zhì)化處理和第一火次大變形的開坯技術(shù)，由此奠定了A-100鋼開坯鍛造的技術(shù)基礎(chǔ)。A-100鋼斷裂韌度更易受到熱變形工藝參數(shù)的影響，1140℃及以上溫度加熱后20%以內(nèi)的小變形導(dǎo)致晶粒粗大甚至出現(xiàn)混晶，降低斷裂韌度。低溫鍛造變形后，A-100鋼的二次硬化規(guī)律明顯變化，抗拉強度峰值溫度后移至468℃，過時效隨溫度的升高，強度降低緩慢。A-100鋼具有循環(huán)硬化特征，疲勞裂紋擴(kuò)展性能優(yōu)于300M鋼；3.5% NaCl鹽水的腐蝕環(huán)境對A-100鋼的高周疲勞性能有顯著的弱化作用。

The basic features of A-100 steel, such as relationship between cogging process and mechanical properties, relationship among the forging process, grain size and mechanical properties, secondary hardening, and fatigue properties were discussed. The high-temperature homogenization and high deformation at first step technique were developed on the foundation of multiple upsetting and stretching, high forging ratio technique used for 300M steel, and became the technique foundation of cogging process in A-100 steel. The fracture toughness of A-100 steel was tended to be influenced by hot working process. The grain size grew heavily, and mixed grain structure was appeared after heating at 1140℃ and above with deformation amount below 20%, the fracture toughness was also decreased. The secondary hardening performance of A-100 steel was changed after the deformation at low temperature. The tensile strength peak temperature was changed to 468℃,the tensile strength was decreased slowly when over aging. A-100 steel was cyclic hardened, and its fatigue crack growth properties were better than 300M steel. The high cycle fatigue property was heavily deteriorated when tested in 3.5%NaCl solution.

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