HIP处理对TiAl基合金排气门组织和性能的影响

盛文斌

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HIP处理对TiAl基合金排气门组织和性能的影响
Effects of HIP Treatment on Microstructure and Properties of TiAl-based Alloy Exhausted Valve
2006年第4期页码：245-247
纸质出版日期： 2006 ，
DOI：

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[1]盛文斌.HIP处理对TiAl基合金排气门组织和性能的影响[J].特种铸造及有色合金,2006(04):245-247+192.

Sheng Wenbin. Effects of HIP Treatment on Microstructure and Properties of TiAl-based Alloy Exhausted Valve[J]. Special Casting & Nonferrous Alloys, 2006,(4):245-247.
[1]盛文斌.HIP处理对TiAl基合金排气门组织和性能的影响[J].特种铸造及有色合金,2006(04):245-247+192. DOI：

Sheng Wenbin. Effects of HIP Treatment on Microstructure and Properties of TiAl-based Alloy Exhausted Valve[J]. Special Casting & Nonferrous Alloys, 2006,(4):245-247. DOI：

摘要

利用感应凝壳熔炼方法

在预热的金属型中离心浇注了名义成分为Ti48Al2Cr2Nb的CA4GE型发动机用排气门。将排气门经1270℃在173MPa保温4h热等静压（HIP）处理后

其组织结构为双态组织

γ相在边界附近

尺寸较小

分布较为均匀

力学性能在815℃时σb达到470MPa

比铸态（370MPa）提高了100MPa

伸长率明显提高

达到10%以上。

Abstract

Ti-48Al-2Cr-2Nb exhaust valves for CA4GE engine have been manufactured by centrifugally pouring the molten melt into preheated permanent mold in induction skull melting furnace.After HIP with 173 MPa at 1 270 ℃ for 4 hours

the microstructure is composed of double-phase structure

where γ phase with smaller size is uniformly distributed into near boundary.Tensile strength reaches 470 MPa at 815 ℃

increased by 100 MPa comparing with 370 MPa for as-cast structure

and elongation is increased by more than 10%.