典型文献
Towards creep property improvement of selective laser melted Ni-based superalloy IN738LC
文献摘要：
Nickel-based superalloy IN738LC produced by selective laser melting(SLM)exhibits inferior high-temperature creep properties than its cast counterparts due to relatively smaller grain size,particularly for the plane normal to the building direction.This work studied effects of post heating strategy on the microstructure and especially the grain size to improve the high temperature creep resistance.The as-built microstructure exhibited a fine grain size and large quantities of MC carbides that could effectively hinder grain growth.It was found that unconventional two-step heat treatments could lead to substantial grain growth,and the effect is particularly prominent at a specific temperature.The ease of grain growth was explained after classifying the microstructural evolution(boundary carbide transformation)during each heating step and related to the reduced grain boundary pinning force from MC carbides.Creep tests validated the effect of the new heat treatment scheme on the SLM-processed IN738LC at 850℃.An ex-tended creep fracture life(1.5 to 4 times improvement)and lower secondary creep rates were achieved with samples subjected to the newly optimized two-step heat treatment.The complete creep curves are also firstly presented for SLM-IN738LC,confirming the effectiveness of grain growth and highlighting the importance of dedicated heat treatment for SLM superalloys.
文献关键词：
中图分类号：
作者姓名：
H.Y.Song;M.C.Lam;Y.Chen;S.Wu;Hodgson;X.H.Wu;Y.M.Zhu;A.J.Huang
作者机构：
Monash Centre for Additive Manufacturing,15-17 Normanby Rd,Notting Hill,VIC 3168,Australia;Department for of Materials Science and Engineering,Monash University,Clayton,VIC 3800,Australia;Monash Centre for Electron Microscopy,10 Innovation Walk,Clayton,VIC 3800,Australia;Institute for Frontier Materials,Deakin University,VIC 3216,Australia
文献出处：
引用格式：
[1]H.Y.Song;M.C.Lam;Y.Chen;S.Wu;Hodgson;X.H.Wu;Y.M.Zhu;A.J.Huang-.Towards creep property improvement of selective laser melted Ni-based superalloy IN738LC)[J].材料科学技术（英文版）,2022(17):301-314
A类：
IN738LC
B类：
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AB值：
0.553471
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