中间坯加热参数对无磁钻具用钢晶粒度均匀性的影响  

Influence of intermediate billet heating parameters on grain size uniformity of steel for non-magnetic drilling tools

作　　者：李占华 雷冲 马姣 郑安雄 闫治坤 Li Zhanhua;Lei Chong;Ma Jiao;Zheng Anxiong;Yan Zhikun(Technique Center,Henan Zhongyuan Special Steel Equipment Manufacturing Co.,Ltd.,Jiyuan Henan 459000,China)

机构地区：[1]河南中原特钢装备制造有限公司技术中心,河南济源459000

出　　处：《金属热处理》2024年第10期114-117,共4页Heat Treatment of Metals

摘　　要：无磁钻具用钢为200系奥氏体不锈钢,其高强度特性要求是通过强化变形得到,无需热处理,导致该产品热锻后的晶粒均匀性较差,不能满足晶粒度级差在2级以内的要求。通过在无磁钻具产品强化变形前增加中间坯加热工序,研究了中间坯加热温度和时间对无磁钻具用钢晶粒均匀性的影响。结果表明,强化变形前中间坯经1100℃加热2~6 h,晶粒度的级别和均匀性均较理想,晶粒度在3级以上,级差在2级以内。中间坯加热温度过高时虽然会使晶粒度更均匀,但会导致晶粒相互吞噬趋势加剧造成晶粒粗大,加热温度过低则形核及静态再结晶能量不足,达不到晶粒均匀性的目的。Non-magnetic drlling steel is 200 series austenitic stainless steel,its high strength characteristics are obtained by strengthening deformation,without heat treatment,resulting in poor grain uniformity after hot forging,can not meet the requirements of grain size difference within level 2.The effect of heating temperature and soaking time of intermediate billet on grain uniformity of non-magnetic drilling steel was studied by means of increasing the heating process of intermediate billet before strengthening deformation of non-magnetic drilling products.The results show that when the intermediate billet is heated at 1100℃ for 2-6 h before strengthening deformation,the grain size and uniformity are ideal,the grain size is above grade 3,and the grade difference is within level 2.Although the heating temperature of the intermediate billet is too high,it will make the grain size more uniform,but it will lead to the trend of mutual merging of grains resulting in coarse grains,and the heating temperature is too low,nucleation and static recrystallization energy is insufficient,and the purpose of grain uniformity cannot be achieved.

关 键 词：无磁钻具用钢 晶粒度均匀性 中间坯加热 

分 类 号：TG156.1[金属学及工艺—热处理]