Ⅱ型30CrMnSiA钢回火脆性研究  

Study on temper brittleness for 30CrMnSiA steel of type Ⅱ

作　　者：黄有华[1] 艾永平 Huang Youhua;Ai Yongping(College of Mechanical Engineering,Jiangxi Vocational and Technical College of Mechanical and Electrical Engineering,Nanchang 330006,China;College of Mechanical and Electrical Engineering,Jinggangshan University,Ji′an 343009,China)

机构地区：[1]江西机电职业技术学院机械工程学院,江西南昌330006 [2]井冈山大学机电工程学院机械系,江西吉安343009

出　　处：《锻压技术》2024年第12期162-165,共4页Forging & Stamping Technology

摘　　要：为解决Ⅱ型30CrMnSiA钢容易产生回火脆性,导致冲击韧性降低进而引发疲劳断裂事故的问题,对Ⅱ型30CrMnSiA钢在不同温度和冷却介质下进行了淬火和回火处理,分析了Ⅱ型30CrMnSiA钢回火后的力学性能和微观结构,研究了回火脆性与回火冷却速率的关系。结果表明:Ⅱ型30CrMnSiA钢基质中的碳化物在晶界和晶粒内分散分布,650℃回火后的硬度较510℃回火后的硬度显著降低;510℃回火属于钢的脆性段,回火后产生的脆性与回火冷却速率无关,在此温度下无论是快冷还是慢冷均会产生回火脆性,应尽量避免在此温度下回火;在相同的回火温度下,快速冷却比缓慢冷却的硬度高,但冲击性能差别不大,且冲击性能主要受回火温度的影响。In order to solve the problem of 30CrMnSiA steel of type Ⅱ being prone to temper brittleness,which leads to a decrease in impact toughness and subsequently caused fatigue fracture accidents,the quenching and tempering treatments of 30CrMnSiA steel of type Ⅱ were carried out at different temperatures and cooling media,and the mechanical properties and microstructure of 30CrMnSiA steel of type Ⅱ after tempering were analyzed.Then,the relationship between tempering brittleness and tempering cooling rate of 30CrMnSiA steel of type Ⅱ was studied.The results show that carbides in the matrix of 30CrMnSiA steel of type II are disperseclly distributed at grain boundaries and within grains,and the hardness after tempering at 650℃is significantly reduced compared to that after tempering at 510℃.Tempering at 510℃belongs to the brittle section of 30CrMnSiA steel of type II.The brittleness generated after tempering is independent of the cooling rate of tempering.At this temperature,whether it is fast cooling or slow cooling,tempering brittleness occurs,and tempering at this temperature should be avoided as much as possible.At the same temperature of tempering,the hardness of rapid cooling is higher than that of slow cooling,but the difference in impact performance is not significant,and the impact performance is mainly affected by the tempering temperature.

关 键 词：合金结构钢 回火脆性 冷却速率 冲击韧性 力学性能 

分 类 号：TB31[一般工业技术—材料科学与工程]