时效工艺对2507不锈钢σ相析出及力学性能的影响
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摘要
通过拉伸、硬度、冲击试验研究了时效温度、时间对2507超级双相不锈钢力学性能的影响,并应用EBSD技术观察了σ相的析出。结果表明:在900~1000℃区域,随时效温度降低,σ相析出量增加,材料塑性变差,温度低于940℃时效10 min其伸长率低于10%;在600~700℃区域,随时效温度升高,σ相析出量增加,但析出时间较高温区域长,力学性能恶化不太严重,600~650℃时效40 h内伸长率>20%,冲击吸收能量>10 J。
Effects of aging temperature and time on mechanical properties of 2507 super duplex stainless steel were studied by means of tensile,hardness and impact tests,and the precipitation of the σ phase was observed by means of EBSD. The results show that with the decrease of aging temperature,the precipitation of the σ-phase increases and the plasticity of the material becomes worse at 900-1000 ℃region,the elongation is lower than 10% under the condition of aging temperature below 940 ℃ and aged for 10 min. At 600-700 ℃ region,with the increase of aging temperature,the precipitation of the σ-phase increases,but the aging time is greatly prolonged compared with that the higher temperature region,and the deterioration of mechanical properties is not very serious,the elongation is higher than 20% and impact absorbed energy is higher than 10 J under the aging condition of 600-650 ℃ and 40 h.
Effects of aging temperature and time on mechanical properties of 2507 super duplex stainless steel were studied by means of tensile,hardness and impact tests,and the precipitation of the σ phase was observed by means of EBSD. The results show that with the decrease of aging temperature,the precipitation of the σ-phase increases and the plasticity of the material becomes worse at 900-1000 ℃region,the elongation is lower than 10% under the condition of aging temperature below 940 ℃ and aged for 10 min. At 600-700 ℃ region,with the increase of aging temperature,the precipitation of the σ-phase increases,but the aging time is greatly prolonged compared with that the higher temperature region,and the deterioration of mechanical properties is not very serious,the elongation is higher than 20% and impact absorbed energy is higher than 10 J under the aging condition of 600-650 ℃ and 40 h.
引文
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[2]陈兴润,潘吉祥.固溶温度对2205双相不锈钢组织和点蚀性能的影响[J].金属热处理,2014,39(12):38-42.Chen Xingrun,Pan Jixiang.Influence of solution temperature on microstructure and pitting corrosion of 2205 duplex stainless steel[J].Heat Treatment of Metals,2014,39(12):38-42.
[3]孙祺,王剑,何燕,等.时效时间对2205双相不锈钢中第二相析出行为的影响[J].金属热处理,2016,41(2):63-66.Sun Qi,Wang Jian,He Yan,et al.Influence of aging time on precipitation behavior of 2205 duplex stainless steel[J].Heat Treatment of Metals,2016,41(12):63-66.
[4]黄澳,陈吉,宋见,等.时效时间对2205双相不锈钢组织与疲劳裂纹扩展规律的影响[J].金属热处理,2016,41(10):167-171.Huang Ao,Chen Ji,Song Jian,et al.Effect of aging time on microstructure and fatigue crack propagation behavior of 2205 duplex stainless steel[J].Heat Treatment of Metals,2016,41(10):167-171.
[5]黄锐.S31803双相不锈中σ析出相及其对性能的影响研究[D].西安:西安建筑科技大学,2009.
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