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金属学报  2012, Vol. 48 Issue (6): 654-660    DOI: 10.3724/SP.J.1037.2012.00061
  论文 本期目录 | 过刊浏览 |
热处理工艺对一种新型铸造镍基高温合金的组织和性能影响
杨金侠1,李金国1,王猛1,王延辉2,金涛1,孙晓峰1
1. 中国科学院金属研究所, 沈阳 110016
2. 中航工业黎明公司, 沈阳 110043
EFFECTS OF HEAT TREATMENT PROCESS ON THE MICROSTRUCTURE AND PROPERTIES OF A NEW CAST NICKEL-BASED SUPERALLOY
YANG Jinxia1, LI Jinguo1, WANG Meng1, WANG Yanhui2,JIN Tao1, SUN Xiaofeng1
1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang  110016
2. Liming Aeroengine Company, Shenyang  110043
全文: PDF(3232 KB)  
摘要: 通过改变固溶热处理温度、保温时间和固溶后冷却方式, 研究了不同固溶热处理工艺对一种新型铸造高温合金组织和性能的影响. 结果表明, 将合金在不同温度固溶处理2 h后空冷, 合金在760 ℃, 660 MPa和 980 ℃, 180 MPa条件下的持久寿命随热处理温度的升高先升高而后降低; 固溶处理温度为 1220 ℃时, 760 ℃, 660 MPa条件下的持久寿命达到最高; 固溶处理温度为1180 ℃时, 980 ℃, 180 MPa条件下的持久寿命最高; 当热处理温度从1120 ℃升高到1220 ℃时, 拉伸强度随温度升高而增加, 继续升温到1240 ℃, 拉伸强度下降. 当固溶热处理温度为1120℃, 处理时间在2---8 h范围内变化时, 合金在760 ℃, 660 MPa条件下的持久寿命随时间延长而降低, 而在980 ℃, 180 MPa条件下的持久寿命随处理时间延长而升高; 当热处理时间为2和4 h时, 拉伸强度较高; 延长到6和8 h时, 拉伸强度下降. 当冷却方式不同时, 合金持久性能也发生变化. γ'相和γ/γ'共晶组织在尺寸、形态、分布和数量上的变化是导致合金力学性能变化的关键因素.
关键词 热处理力学性能持久寿命拉伸强度    
Abstract:A new casting Ni-based superalloy is used in industrial and aircraft turbine because of its high strength and excellent hot corrosion resistance at high temperatures (about 900 ℃). The effect of heat treatment process on its microstructure and mechanical properties of the experimental casting Ni--based superalloy was studied in the present investigation in order to improve its application level. The results showed that the stress--rupture lives were changed with the increase of heat treatment temperatures. After solution treated for 2 h, then cooling by air cooling, the stress-rupture life under the conditions of 760 ℃ and 660 MPa was the highest in the case of heat treatment temperature at 1220 ℃, while under the testing conditions of 980 ℃ and 180 MPa the stress--rupture life was the highest in the case of heat treatment temperature at 1180 ℃. The stress--rupture life decreased when being heat-treated at temperatures above 1220 or 1180 ℃. The tensile strength of the alloy was improved with the increase of heat treatment temperatures from 1120 to 1220 ℃, and was decreased in the case of heat treatment temperature at 1240 ℃. The experimental results also showed that with the increment of holding time from 2 to 8 h at 1120 ℃ the stress--rupture life increased under the conditions of 760 ℃ and 660 MPa, while it was decreased under the conditions of 980 ℃ and 180 MPa. It was found that the tensile strength was higher for the alloy being held for 2 and 4 h than that for the alloy being held for 6 and 8 h, and the stress--rupture lives changed with the different cooling ways. The mechanical properties of the alloy may be determined by the size, shape, distribution and volume fractions of γ' phase and γ/γ' eutectic.
Key wordsheat treatment    mechanical property    stress-rupture life    tensile strength
收稿日期: 2012-02-13      出版日期: 2012-06-11
基金资助:

国家重点基础研究发展计划项目2010CB631200和2010CB631206及国家自然科学基金项目50931004和50971124资助
杨金侠, 女, 1970年生, 副研究员, 博士
10.3724/SP.J.1037.2012.00061

通讯作者: 杨金侠     E-mail: jxyang@imr.ac.cn
作者简介: 杨金侠, 女, 1970年生, 副研究员, 博士

引用本文:

杨金侠,李金国,王猛,王延辉,金涛,孙晓峰. 热处理工艺对一种新型铸造镍基高温合金的组织和性能影响[J]. 金属学报, 2012, 48(6): 654-660.
YANG Jinxia , LI Jinguo, WANG Meng, WANG Yanhui,JIN Tao, SUN Xiaofeng. EFFECTS OF HEAT TREATMENT PROCESS ON THE MICROSTRUCTURE AND PROPERTIES OF A NEW CAST NICKEL-BASED SUPERALLOY. Acta Metall Sin, 2012, 48(6): 654-660.

链接本文:

http://www.ams.org.cn/CN/10.3724/SP.J.1037.2012.00061      或      http://www.ams.org.cn/CN/Y2012/V48/I6/654

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