N含量对17-4PH马氏体时效不锈钢铁素体相和性能的影响
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摘要
试验用17-4PH不锈钢(/%:0.02～0.03C,0.40～0.54Si,0.41～0.60Mn,0.018～0.026P,0.001S,15. 56～15. 75Cr,4. 31～4. 50Ni,3. 21～3.40Cu,0. 20～0. 25Nb,0. 013～0. 067N)采用20 t EAF+LF+VOD+ESR的工艺冶炼,锻造成Φ150 mm棒材。试验结果表明:钢中N含量由0.013%增加至0.067%时,钢中铁素体含量由0.5%增至6%,钢的强度、硬度升高,塑性降低。当N含量控制在0.020%～0.045%,钢中铁素体含量为1%～3%,经1040℃1 h水冷+480 2 h空冷后,钢的力学性能合格;固溶态钢的HB硬度值≤325,优化了该材料的加工性能。
The tested stainless steel 17-4 PH(/%: 0.02 ～0.03 C,0. 40 ～0.50 Si,0. 41 ～0.60 Mn,0.018 ～0. 026 P, 0. 001 S, 15. 56 ～ 15.75 Cr, 4. 31 ～ 4. 50 Ni, 3. 21～ 3.40 Cu, 0. 20 ～ 0. 25 Nb, 0. 013 ～ 0. 067 N) is melted by20 t EAF + LF + VOD + ESR process and forged to Φ150 mm bar products. Test results show that with increasing N content in steel from 0. 013% to 0. 067%, the ferrite content in steel increases from 0. 5% to 6%, the strength and hardness of steel increase and the plasticity of steel decreases. As to control the N content in steel 0. 020%～0. 045%, the ferrite content in steel is 1% ～3% and the mechanical properties of steel quenched at 1 040℃ for 1 h, water cooling + 480℃ for2 h, air cooling, the mechanical properties of test steel are qualified; and the HB hardness value of solid-solution-treated steel is ≤325, so the workability of steel is improved.
The tested stainless steel 17-4 PH(/%: 0.02 ～0.03 C,0. 40 ～0.50 Si,0. 41 ～0.60 Mn,0.018 ～0. 026 P, 0. 001 S, 15. 56 ～ 15.75 Cr, 4. 31 ～ 4. 50 Ni, 3. 21～ 3.40 Cu, 0. 20 ～ 0. 25 Nb, 0. 013 ～ 0. 067 N) is melted by20 t EAF + LF + VOD + ESR process and forged to Φ150 mm bar products. Test results show that with increasing N content in steel from 0. 013% to 0. 067%, the ferrite content in steel increases from 0. 5% to 6%, the strength and hardness of steel increase and the plasticity of steel decreases. As to control the N content in steel 0. 020%～0. 045%, the ferrite content in steel is 1% ～3% and the mechanical properties of steel quenched at 1 040℃ for 1 h, water cooling + 480℃ for2 h, air cooling, the mechanical properties of test steel are qualified; and the HB hardness value of solid-solution-treated steel is ≤325, so the workability of steel is improved.
引文
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[2]孙桂华,刘彦秋.浅谈17-4PH沉淀硬化不锈钢[J].化工设计通讯,2013,39(2):83-85.
[3]杨刚,刘军和,冯贞伟,等.合金元素对OCr17Ni4Cu4Nb不锈钢组织与力学性能的影响-碳(1)[J].特钢技术,2010,16(3):5-9,17.
[4]李茹,杨钢,王剑星,等.合金元素对OCr17Ni4Cu4Nb不锈钢组织与力学性能的影响-镍(4)[J].特钢技术,2011,17(2):12-17.
[5]杨钢,赵兴东,史凤岭,等.合金元素对OCr17Ni4Cu4Nb不锈钢组织与力学性能的影响-铬(2)[J].特钢技术,2010,16(4):9-14.
[6]杨钢,王剑星,李许明,等.合金元素-铌对0Cr17Ni4Cu4Nb不锈钢组织与力学性能的影响[J].特钢技术,2011,17(3):5-9.
[7]王剑星,杨钢,张忠模,等.Cu含量对马氏体沉淀硬化不锈钢0Cr17Ni4Cu4Nb组织和性能的影响[J].特殊钢,2017,38(3):66-69.
[8]柯其棠,柳学胜,陈长西,等.EAF-VOD-2.5 t ESR-锻造流程生产Φ350 mm 17-4PH不锈钢[J].特殊钢,2006,27(6):61-62.
[9]翟爱群,杨钢,蔡梅,等.0Cr17Ni4Cu4Nb沉淀硬化不锈钢锻造裂纹分析[J].特钢技术,2012,18(2):5-9.
[10]郑善举,杨卯生,张启福,等.氮元素对马氏体不锈钢组织和性能的影响[J].材料热处理学报,2017,38(1):100-105.