摘要
35CrNi3MoV钢是一种中碳低合金调质钢,在生产中因钢锭尺寸大、锻造不充分、锻造温度高,组织遗传问题非常强烈。高温990℃正火虽然使35CrNi3MoV系钢中合金渗碳体溶解,原始粗大针状贝氏体沿针状位向分布合金渗碳体钉扎作用减弱,得以细化晶粒,但温度过高会导致晶粒二次长大,反而增加晶粒长大驱动力;600℃等温退火后最终形成平衡组织,原取向消失,组织弥散度增加,有利于细化晶粒。由于保温时间短、温度选取不合适时,会出现贝氏体和珠光体混合组织,不利于后续晶粒度细化。
35CrNi3MoV is a kind of medium carbon low alloy tempered steel,due to large ingot size,insufficient forging and high forging temperature,it often shows serious problem relates to microstructure heredity.Although application of 990℃high temperature normalizing is able to dissolve the alloy cementite in the 35CrNi3MoV steel,weaken the pinning effect of the alloy cementites which distribute along the acicular orientation of the original coarse acicular bainite and refine the grain,over-high temperature will lead to secondary grain growth and even increase the driving force of grain growth;while isothermal annealing at 600℃is able to form equilibrium structure,the original orientation disappears and the structural dispersion increases,leading to beneficial results for grain refinement.Due to the short holding time,if the temperature selected is inappropriate,there will be a mixture of bainite and pearlite which is unfavorable for subsequent grain size refinement.
作者
刘涵赜
张学瑞
黄冠
杨志洪
Liu Hanze;Zhang Xuerui;Huang Guan;Yang Zhihong
出处
《一重技术》
2024年第6期28-31,共4页
CFHI Technology
作者简介
刘涵赜,天津重型装备工程研究有限公司助理工程师,天津300457;张学瑞,天津重型装备工程研究有限公司工程师,天津300457;黄冠,天津重型装备工程研究有限公司工程师,天津300457;杨志洪,天津重型装备工程研究有限公司研究员级高级工程师,天津300457。
