摘要
2.25Cr1Mo钢是我国四代先进钠冷快堆热交换器主体结构材料,掌握钢中有害元素适宜控制范围是实现部件国产化制造的关键环节。采用步冷处理试验方法研究了不同P含量对2.25Cr1Mo钢第二类回火脆性倾向的影响。结果表明:P含量会对2.25Cr1Mo钢第二类回火脆性产生显著影响。当钢中P含量为0.002%(质量分数,下同)时,第二类回火脆性敏感系数为-51.4℃,脆化倾向小。当P含量升至0.012%,尽管该数值满足ASTM-A387标准规定的P含量要求范围(≤0.035%),但钢的第二类回火脆性敏感系数已达59.6℃,具有较强的回火脆性倾向。当P含量为0.05%时,步冷处理前后钢的冲击功均较0.012%P试验钢有了明显降低,且脆性敏感系数高达174℃,回火脆性倾向极大。在对2.25Cr1Mo钢成分设计时,建议P含量控制在0.002%为宜。
2.25Cr1Mo steel is the main structural material of the fourth generation advanced sodium cooled fast reactor heat exchanger in China.Mastering the appropriate control range of trace elements in steel is the key link to realize the domestic manufacturing of components.The effect of different P contents on the second kind of temper brittleness tendency of the 2.25Cr1Mo steel was studied by step cooling test.The results showed that the P content had a significant effect on the second type tempering brittleness of the 2.25Cr1Mo steel.When the P content in 2.25Cr1Mo steel was 0.002%(mass fraction,the same below),the second type of temper brittleness sensitivity coefficient was only-51.4℃,and the temper brittleness tendency was small.When the P content rised to 0.012%,although the value met the P content requirements specified in ASTM-A387(≤0.035%),the second type of tempering brittleness sensitivity coefficient of the steel reached 59.6℃,with a strong tendency of the tempering brittleness.When the P content was 0.05 wt.%,the impact energy of the steel before and after step cooling treatment was significantly lower than that of the experimental steel containing 0.012%P,and the sensitivity coefficient of the second type of tempering brittleness was as high as 174℃,which indicates its tempering brittleness tendency was very great.It is necessary to further strictly control the P content in 2.25Cr1Mo steel,and it is suggested that the P content should be controlled at 0.002%.
作者
伞晶超
李小兵
SAN Jing-chao;LI Xiao-bing(Liaoning Equipment Manufacturing Vocational and Technical College,Shenyang 110161,Liaoning,China;Ji Hua Laboratory,Foshan 528200,Guangdong,China)
出处
《铸造》
CAS
北大核心
2022年第7期857-861,共5页
Foundry
基金
辽宁省教育厅研究经费面上项目(LJKZ1284)
国家自然科学基金资助项目(51801210)。
