Fatigue performance of additively manufactured 316L stainless steel

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The purchase pace of the demand side of the international thermal coal market continues to slow down, and the international price of thermal coal continues to decline. Thermal coal prices at major international ports continued to fall last week as European buyers slowed in recent days for April, coupled with weaker than expected import demand from end users in China. According to China’s Coal Market Net Watch: As of March 25, Australia’s Port of Newcastle thermal coal price index was $253/tonne, compared to $309.02/tonne on March 18, a decline of 56.02 USD/tonne, a decrease of 18.13%. South Africa’s Port Richards thermal coal price index was $264.5/tonne, down US$62.72/tonne or 19.17% from US$327.22/tonne in March 18. The European ARA Tri-port thermal coal price index was $281.8/ton. Does the price of thermal coal in major international ports continue to drop to affect the price of 316L stainless steel?

Additive manufacturing (AM) of metal parts

Additive manufacturing (AM) of metal parts can be done using a variety of different process technologies, which use powder, wire or sheet as raw materials. The additive manufacturing process using metal powder as raw material is Selective Laser Melting (SLM), Electron Beam Melting (EBM), and Binder Jetting Printing (BJP). This is called powder bed processes. SLM and EBM technologies respectively use laser beams and electron beams to melt the powder. The microstructure and mechanical properties of various alloy parts made using these two technologies are the most widely reported in research. On the contrary, there is relatively little exploration of the BJP process. The structure-performance correlation of metal parts produced by this process has not yet received much attention.

The main advantage of the BJP process is that it can (compared to other powder bed processes) produce parts at a relatively low cost and at a faster speed. The important thing is that it is applicable to any type of alloy, and additive manufacturing using SLM/EBM technology can only be performed on a few alloys. The porosity level of BJP alloys is often very high, which can have a profound impact on its performance. A researcher studied the microstructure, porosity and its effect on the tensile and highly cyclic fatigue (HCF) behavior of 316L austenitic stainless steel with different manufacturing processes.

In general, BJP and CM 316L stainless steels have a high work hardening capacity, which gives them high ductility. The SLM alloy has a high yield strength, but the dislocations slip at the onset of plastic deformation, which shortens the work hardening process and affects the ductility. The results of this research can guide the design of additive manufacturing alloys: the higher porosity of BJP does not negatively affect hypercyclic fatigue performance, but it does reduce yield strength. Therefore, reducing porosity can essentially increase the yield strength of BJP parts, making it the same as that of CM alloy. For SLM specimens, it is evident that insufficient fusion pores must be minimized (if not completely eliminated) to reduce overall porosity and increase fatigue strength.

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China’s Non-Manufacturing Purchasing Managers Index for March was released today by the China Federation of Logistics and Purchasing and the Service Industry Survey Center of the National Bureau of Statistics. A business activity index for the non-manufacturing sector as a whole fell below 50% in March.

In March, China’s non-manufacturing business activity index was 48.4 percent, down 3.2 percentage points from the previous month. The new orders index was 45.7%, down 1.9 percentage points from the previous month, indicating a significant slowdown in the growth of supply and demand in the non-manufacturing sector compared to to the previous month. In terms of sectors, the business activity index and new orders index for transport, accommodation and food services, culture, sports and entertainment and tourism-related industries all fell. significantly compared to the previous month.

Then the 316L stainless steel in the market may be affected by major changes, the price will also be volatile, if you want to know the latest 316L stainless steel news, please feel free to contact us.

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