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Fatigue Performance of Additively Manufactured 316L Stainless Steel

The purchasing pace at the demand end of the international thermal coal market continues to slow down and the international thermal coal price continues to decline. Prices for thermal coal at major international ports continued to fall last week as buyers in Europe slowed in recent days for April, coupled with weaker-than-expected import demand from End users in China. According to China Coal Market net monitoring: as of March 25, Australia Newcastle port thermal coal price index was 253 USD/ton, compared with 309.02 USD/ton as of March 18, down 56.02 USD/ton, down 18.13%. South Africa’s Port Richards thermal coal price Index was $264.5 / mt, down the US $62.72 / mt or 19.17% from US $327.22 / mt as of 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 decline to affect the price of the 316L Stainless Steel?

Additive manufacturing (AM) of metal parts

Additive manufacturing (AM) of metal parts can be achieved 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 Jet
Printing (BJP). These are called powder bed processes. SLM and EBM technologies
use laser beams and electron beams to melt powder, respectively. The
microstructure and mechanical properties of different alloy parts manufactured
using these two technologies are the most widely reported in the 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 widespread attention.

316L

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 kind of alloy, and
additive manufacturing using SLM/EBM technology can only be performed on a few
alloys. The porosity level in BJP alloys is often very high, which may have a
profound impact on its performance. A researcher studied the microstructure,
porosity and its effect on tensile and high cycle fatigue (HCF) behavior of 316L
austenitic stainless steel with different manufacturing processes.


In general, BJP and CM 316L stainless steels have strong work hardening
ability, which gives them great ductility. SLM alloy has a high yield strength,
but dislocations cross slip at the beginning of plastic deformation, which
shortens the work hardening process and affects ductility. The results of this
research can guide the design of additive manufacturing alloys: the higher
porosity of BJP does not adversely affect the high-cycle fatigue performance,
but it reduces the yield strength. Therefore, reducing the porosity can
basically increase the yield strength of BJP parts, making it the same as that
of CM alloy. For SLM specimens, it is obvious that insufficient fusion pores
should be reduced to a minimum (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 by the China Federation of Logistics and Purchasing and the Service Industry Survey Center of the National Bureau of Statistics today. An index of business activity for the non-manufacturing sector as a whole fell below 50 percent in March.

In March, China’s non-manufacturing business activity index was 48.4%, down 3.2 percentage points from the previous month. The new orders index was 45.7 percent, 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 from the previous month.  In terms of sectors, the business activity index and new order index of transportation, accommodation and catering, culture, sports and entertainment, and tourism-related industries all declined significantly from the previous month.

Then the 316L Stainless Steel of the market may be affected by significant changes, the price will also be volatile, if you want to know the latest news of the 316L Stainless Steel, welcome to contact us.

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