316L stainless steel is being extensively employed as structural material in infrastructural, automotive, aerospace, and nuclear energy applications. However, one of the major drawbacks which limits its wider applications is its low yield strength (170-300 MPa in annealed state). We explored the strengthening of 316L stainless steel with dispersed ceramic particles through selective laser melting (SLM). The feedstock, powder mixture of 316L powder and ceramic particles, was mixed using low energy ball milling process. This method has a neglectable change on powder’s flowability and shape. Results showed that the ceramic particles were uniformly dispersed in the 316L matrix after SLM. In the meantime, the grain size of the 316L was significantly refined. Tensile tests showed that the yield strength of the strengthened 316L was increased about 40% (from 599 to 832 MPa). Meanwhile, the 316L stainless steel with dispersed ceramic particles has a good combination of high strength and ductility. The strength enhancement is primarily attributed to grain refinement and Orowan strengthening. These findings offer a new perspective on the strengthening of 316L stainless steel.

Strengthening of 316L stainless steel through selective laser melting and dispersed ceramic particles

γ-TiAl-based alloys have been studied for decades due to their attractive properties. The material has been successfully employed in the making of turbocharger for passenger vehicles and turbine blades for aircraft engines. However, the applications are still limited because of their poor formability. Electron beam powder bed fusion (EBPBF) is advanced in fabricating components with high complexity using the layer-wise building method. Studies have shown that γ-TiAl alloys can be successfully fabricated using EBPBF. In this work, a bimetal component consists of Ti-48Al-2Cr-2Nb (turbine blade) and Ti-6Al-4V (fir tree mount) was designed. To avoid the formation process of γ-TiAl, Ti-48Al-2Cr-2Nb was fabricated using EBM on a wrought Ti-6Al-4V substrate directly. Straight and curved diffusion interlayers were designed and achieved using different printing strategies. No defect was observed in both of the EBM built parts and the interlayer zones. The average tensile strength of the samples with curved interlayer reached 389 MPa, which was much higher than TiAl/Ti-6Al-4V brazing joints. The tensile test revealed that the fracture occurred in the interlayer zone that consisted of α2-Ti3Al and B2 phases. This work developed a promising application of γ-TiAl based alloys with less formation process.

Additive manufacturing of γ-TiAl and Ti-6Al-4V bimetal component using electron beam powder bed fusion

**Session Chair: **Jun Ding

SYM O - Materials for Additive Manufacturing

technical paper

**Please view our Welcome to MH21 video.**

<center>
<figure class="video_container">
	 <iframe src="https://screencast-o-matic.com/watch/cr1UYHV1pcz?v=6&ff=1&title=0&controls=1" width=826 height=526 frameborder="0" allowfullscreen="true"> </iframe>
</figure>
	</center>


**Walkthrough Video**

Here is a Walkthrough showing how to navigate the conference and network with others 

<center>
<figure class="video_container">
	 <iframe src="https://screencast-o-matic.com/watch/cr1vnrV1paE?v=6&ff=1&title=0&controls=1" width=826 height=526 frameborder="0" allowfullscreen="true"> </iframe>
</figure>
	</center>




	 Organized by
 
<a href="https://mrs.org.sg/">
<img src="https://assets.underline.io/uploads/markdown_image/1/image/95d5789689d5f900b90e9fe54ea3cf0d.jpg"</a>

 
	
	 In association with
 
<a href="http://www.ntu.edu.sg/">
<img src="https://assets.underline.io/uploads/markdown_image/1/image/334cd171ad2fdee033c635b368e5e160.png"</a>
	<a href="https://www.nus.edu.sg/">
<img src="https://assets.underline.io/uploads/markdown_image/1/image/32e6f82c0440f7bb24c590f9f67821bd.png"</a>
		<a href="https://www.a-star.edu.sg/">
<img src="https://assets.underline.io/uploads/markdown_image/1/image/72557865b589cfa3d2a0243ffce4a270.png"</a>
	
 


	 Supported by
 
		 <a href="https://www.visitsingapore.com/mice/en/about-us/about-secb/">
<img src="https://assets.underline.io/uploads/markdown_image/1/image/6e679842ead62be522ba6a630b82d5c9.png"</a>

To access the MH 21 Conference, [please register](https://mh21.mrs.org.sg/event/da3f9651-429f-4763-81b2-ebd7311b6bc8/websitePage:206f7605-1731-41f9-8421-56d3890f398f)

MATERIALS FOR HUMANITY (MH 21)

MH 21 is arranged around 6 themes that focus attention on pressing needs that should be addressed to enhance the well-being of communities and provide a forum for presenting breakthrough discoveries.

Zhai Wengang Nai Mui Ling Sharon

2

SHORT BIO

Presentations

Strengthening of 316L stainless steel through selective laser melting and dispersed ceramic particles

Additive manufacturing of γ-TiAl and Ti-6Al-4V bimetal component using electron beam powder bed fusion

Stay up to date with the latest Underline news!

PRESENTATIONS

CONFERENCES

COMPANY

RESOURCES