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材料研究学报  2016, Vol. 30 Issue (11): 819-824    DOI: 10.11901/1005.3093.2015.624
  论文 本期目录 | 过刊浏览 |
时效工艺对AerMet100钢强韧性能的影响*
王鑫,董洪波(),袁大庆,邹忠波,王明主
南昌航空大学 南昌 330063
Effect of Aging Process on Strength and Toughness of AerMet100 Steel
Xin WANG,Hongbo DONG(),Daqing YUAN,Zongbo ZOU,Mingzhu WANG
Nanchang Hangkong University, Nanchang 330063, China
引用本文:

王鑫, 董洪波, 袁大庆, 邹忠波, 王明主. 时效工艺对AerMet100钢强韧性能的影响*[J]. 材料研究学报, 2016, 30(11): 819-824.
Xin WANG, Hongbo DONG, Daqing YUAN, Zongbo ZOU, Mingzhu WANG. Effect of Aging Process on Strength and Toughness of AerMet100 Steel[J]. Chinese Journal of Materials Research, 2016, 30(11): 819-824.

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摘要: 

采用正常时效、预时效+正常时效、双时效等多种时效工艺对热锻后的AerMet100钢进行热处理, 研究时效工艺对AerMet100钢回火组织及力学性能的影响。结果表明: 正常时效处理后AerMet100钢的抗拉强度较高(1978 MPa), 但是冲击韧性较低(冲击功74J); 双时效处理后冲击韧性较高(冲击功102J), 但是抗拉强度较低(1662 MPa); 经过预时效+正常时效(510℃×30 min, +482℃×5 h)处理得到优良的强韧性能, 其抗拉强度为1946 MPa, 冲击功为104 J。强韧性提高的原因是: 510℃预时效促进了C原子扩散, 提高了膜状逆转奥氏体含量及其稳定性, 有利于韧性的改善; 同时, 预时效保温时间短(≤30 min), 析出相M2C未与基体脱离共格关系, 析出的强化作用提高了强度。

关键词 金属材料二次硬化钢预时效力学性能逆转变奥氏体析出强化    
Abstract

The effect of aging processes on the tempered microstructure and mechanical properties of the forged AerMet100 steel was investigated, while the named processes include normal aging, pre-aging + normal aging and double aging etc. The results show that high tensile strength (1978 MPa) with low impact toughness (AK=74 J) can be obtained by the normal aging process; higher impact toughness (impact energy 102 J) can be obtained by double aging process, but tensile strength is lower (1662 MPa); however, excellent strength and toughness (σb=1946 MPa; AK=104 J) can be obtained by pre aging + normal aging (510℃×30 min, OQ+482℃×5 h, AC) process. The improvment of strength and toughness can be attribute to that the 510℃ pre aging could promote the C atom diffusion, therewith increased the amount and the stability of the flim-like reversed austenite; besides enable the M2C precipitate to maintain a good lattice relationship with the matrix induced by the short time (≤30 min) pre aging, therefore the precipitation strengthening effect was enhanced.

Key wordsmetallic materials    secondary hardening steel    pre aging    mechanical property    reversed austenite    precipitation strengthening
收稿日期: 2015-12-03     
基金资助:* 国家自然科学基金项目51164029、航空科学基金2015ZE56011和江西省科学计划项目20151BBE50042资助
C Ni Cr Mo Co Ti Al Mn S P O N Si Fe
0.23 11.73 3.13 1.25 13.85 0.01 0.01 <0.01 0.001 0.006 0.001 0.001 0.0002 Bal.
表1  AerMet100钢的化学成分
Aging techniques Cryogenic and aging process
No.1 Normal aging -73℃×1 h, AC+482℃×5 h, AC
No.2 Pre aging + Normal aging 510℃×10 min, OQ+ -73℃×1 h, AC+482℃×5 h, AC
No.3 510℃×30 min, OQ+ -73℃×1 h, AC+482℃×5 h, AC
No.4 -73℃×1 h, AC+510℃×10 min, OQ+482℃×5 h, AC
No.5 -73℃×1 h, AC+510℃×30 min, OQ+482℃×5 h, AC
No.6 Double aging -73℃×1 h, AC+510℃×5 h, OQ+300℃×5 h, AC
表2  AerMet100钢热处理方案(OQ, 油淬; AC, 空冷)
σb/MPa σ0.2/MPa δ / % φ/ % Ak/J
No.1 1978 1810 13.4 65 74
No.2 1975 1910 12.4 65 84
No.3 1922 1856 11.7 67 90
No.4 1941 1872 12.3 65 77
No.5 1946 1885 11.9 66 104
No.6 1662 1550 10.7 70 102
表3  不同时效工艺处理后AerMet100钢的力学性能
图1  不同时效工艺AerMet100钢冲击断口的宏观和微观形貌
图2  不同时效工艺AerMet100钢的XRD图谱
图3  AerMet100钢在200-600℃的平衡相热力学计算结果(a) 平衡相体积分数与温度的关系 (b) 奥氏体中元素含量与温度的关系
图4  时效后逆转变奥氏体的TEM明场像
图5  预时效+正常时效后析出相M2C的明场像
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