采用SEM、TEM等方法研究了不同回火温度对300M超高强度钢的显微组织和力学性能的影响。结果表明,300M钢经870℃淬火后,在290～320℃范围内回火,显微组织为板条马氏体、下贝氏体和残留奥氏体组成。随着回火温度的升高,板条马氏体宽度由260 nm增加到437 nm,位错密度减小,下贝氏体含量增多;合金的抗拉强度有所下降,韧性呈上升趋势,而屈服强度、伸长率和断面收缩率变化较小。当回火温度为300℃时,强度、塑性和韧性达到一个最佳匹配,合金具有最优的综合力学性能。
Effect of different tempering temperature on microstructure and mechanical properties of 300M ultrahigh strength steel was investigated by using transmission electron microscopy（TEM） and scanning electron microscopy（SEM）.The results show that the microstructure of 300M ultrahigh strength steel consists of tempered martensite,lower bainite and residual austenite after quenching at 870 ℃ followed by tempering at 290-320 ℃.With tempering temperature increasing,the width of lath martensite increases from 260 nm to 437 nm,the density of dislocation decreases and the amount of lower bainite increases.The tensile strength of 300M steel declines and its impact toughness increases,however,the yield strength,elongation and area reduction are nearly unchanged with the increase of tempering temperature.The optimal mechanical properties of 300M ultrahigh strength steel can be obtained by tempering at 300 ℃.
参考文献
| [1] | 唐雪明 .300M钢激光相变硬化温度场的数值模拟[D].西北工业大学,2006. |
| [2] | 赵振业.先进飞机结构材料的发展[J].材料工程,1995(01):4. |
| [3] | 刘道新;金石 .300M超高强度钢的应力腐蚀开裂[J].特殊钢,1997,18(06):20-23. |
| [4] | 宋进兵,邓春明,周克崧,刘敏,伍超群,况敏,邓春明,伍超群.表面强化300M低合金钢疲劳性能评价及断裂分析[J].新技术新工艺,2006(02):89-91. |
| [5] | Khan S A;Bhadeshia H K D H .The bainite transformation in chemically heterogeneous 300M high-strength steel[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1990,21(03):859-875. |
| [6] | 王春旭,房昕,刘宪民,王淑琴.回火参数对40Cr3MoV钢性能和组织的影响[J].钢铁研究学报,2002(03):35-38. |
| [7] | 仵海东,范培耕,曹鹏军,徐启昆.热处理对SiMn3型贝氏体高强钢组织和性能的影响[J].金属热处理,2006(08):42-46. |
| [8] | 陈林恒,康永林,黎先浩,温德智,刘国民.回火温度对600MPa级低碳贝氏体钢组织和力学性能的影响[J].北京科技大学学报,2009(08):983-987. |
| [9] | 李云凯,王会珍,许晨旭.热处理工艺对某低合金超高强度钢性能的影响[J].材料科学与工程学报,2010(04):593-596. |
| [10] | Youngblood J L;Raghavan M .Correlation of microstructure with mechanical properties of 300M steel[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1977,8(09):1439-1448. |
| [11] | 刘天琦.回火温度对30CrMnSiNi2A钢组织和性能的影响[J].特殊钢,2003(02):16-18. |
| [12] | 艾云龙;刘长虹;罗军明.工程材料及成形技术[M].北京:科学出版社,2007:94-96. |
| [13] | 解振林,田薇.获得复合组织（马氏体加下贝氏体）的热处理工艺[J].河北理工学院学报,2002(01):19-23. |
| [14] | 张树松;仝爱莲.钢的强韧化机理与技术途径[M].北京:兵器工业出版社,1995:179-197. |
| [15] | 胡海明;朱波;李新富 等.回火温度对ZG75Cr2MnNiMo钢组织和性能的影响[J].金属热处理,1995,20(02):27-28. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%