摘要
研究了700℃0～3 000 h时效对Φ57 mm×9.7 mm S31042无缝钢管(%:0.06C、0.35Si、1.18Mn、24.50Cr、20.54Ni、0.40Nb、0.23N)室温拉伸性能的影响。结果表明,0～1 000 h时效时,随时效时间的增加,S31042钢屈服(R_(p0.2))和抗拉强度(R_m)迅速增加,但钢的伸长率(A)和断面收缩率(Z)急剧降低;当时效时间超过1 000 h,各项性能变化趋缓;随时效时间增加,室温拉伸断口由含丰富韧窝的韧性断口逐渐过渡到沿晶脆性断口;0～1000h时效随时效时间增加,晶界处Cr_(26)C_6相迅速增多,超过1 000 h时效,析出相的变化不明显。
The effect of aging at 700 ℃ for 0 - 3 000 h on ambient tensile properties of Ф57mm×9.7mm seamless tube steel S31042 （% ： 0.06C, 0. 35Si, 1.18Mn, 24. 50Cr, 20. 54Ni, 0. 40Nb, 0. 23N） has been studied. Results show that as aging for 0 - 1 000 h, with increasing aging time the yield strength （Rro.2） and tensile strength （Rm ） of steel S31042 rapidly increase, but the elongation （A） and reduction of area （Z） of steel quick decrease; as aging for more than 1 000 h, the variation of each property index is tending slow ; with increasing aging time, the morphology of ambient tensile fracture gradually transforms from tough fracture with enriching dimples to brittle intercrystalline fracture; as aging for 0 1 000 h, with increasing aging time the amount of Cr23 C6 phase at grain boundary rapidly increases, and as aging time more than 1 000 h, the change of amount of precipitates at grain boundary is not obvious.
出处
《特殊钢》
北大核心
2011年第3期61-64,共4页
Special Steel
基金
国家科技支撑计划课题资助(2007BAE5102)
