时效处理对0Cr15Ni6WMoVNb不锈钢组织及性能的影响
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摘要
研究不同时效温度对0Cr15Ni6WMoVNb马氏体沉淀硬化不锈钢组织及性能影响。采用?45 mm的圆棒经1 000℃,30 min固溶处理后在-70℃冷处理2 h,分别在400~720℃每隔30℃进行时效处理,时间4 h。结果表明:在450℃时效钢的析出相达到峰值,强度较高,韧性和塑性较差。630℃时效时逆转变奥氏体量达到最大值,钢的强度最低,塑性最佳。630℃以上时效时,奥氏体稳定性降低,逆转变奥氏体量减少,钢的强度增加。综合考虑,推荐钢的最佳时效处理温度为510℃。
To research the influence of different ageing temperature on microstructure and properties of 0Cr15Ni6WMoVNb martensite stainless steel. Diameter 45 mm round bar were solution treated at 1 000℃,30 min and then cold treated at-70 ℃,2 h,then aging treated at 400 ~ 720 ℃ per 30 ℃ and time 4 h respectively. Results indicated that steel has the highest strength at 450 ℃,strength is high,toughness and plasticity is poor. Retained austenite reaches the highest value at 630 ℃,the strength of steel is lowest,with the best plasticity. The stability of austenite decreased when aged temperature is over 630 ℃,which results the retained austenite decreasing and strength increasing. To consider comprehensively the steel best aging temperature 510 ℃ is recommended.
To research the influence of different ageing temperature on microstructure and properties of 0Cr15Ni6WMoVNb martensite stainless steel. Diameter 45 mm round bar were solution treated at 1 000℃,30 min and then cold treated at-70 ℃,2 h,then aging treated at 400 ~ 720 ℃ per 30 ℃ and time 4 h respectively. Results indicated that steel has the highest strength at 450 ℃,strength is high,toughness and plasticity is poor. Retained austenite reaches the highest value at 630 ℃,the strength of steel is lowest,with the best plasticity. The stability of austenite decreased when aged temperature is over 630 ℃,which results the retained austenite decreasing and strength increasing. To consider comprehensively the steel best aging temperature 510 ℃ is recommended.
引文
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[6]Lee Y K,Shin H C,Leem D S,et al.Reverse Transformation Mechanism of Martensite to Austenite and Amount of Retained Austenite after Reverse Transformation in Fe-3Si-13Cr-7Ni(wt%)Martensitic Stainless Steel[J].Materials Science and Technology,2003,19(2):393.
[2]魏振宇.国外不锈钢、耐热材料和高强度钢的研究动向[J].钢铁,1981(4):66-71.
[3]赵振业,李志,刘天畸,等.探索新强韧化机制开拓超高强度钢新领域[J].中国工程科学,2003,5(9):26.
[4]陈继勤,程饴萱,卜万龙,等.关于镍钢中的逆转变奥氏体[J].金属热处理学报,1980(2):26.
[5]章守华.钢铁材料学[M].北京:冶金工业出版社,1985:150-162.
[6]Lee Y K,Shin H C,Leem D S,et al.Reverse Transformation Mechanism of Martensite to Austenite and Amount of Retained Austenite after Reverse Transformation in Fe-3Si-13Cr-7Ni(wt%)Martensitic Stainless Steel[J].Materials Science and Technology,2003,19(2):393.